Grease can be applied with a syringe, wood splint because If grease is allowed with fingers there is a possibility the reagent will dissolve the grease and become contaminated. So, the statement is false.
The grease lubricants can come from many sources. Raw materials of the grease includes the base fluids, additives and thickeners used to make lubricating oils and grease may contain paper fiber, plastic debris, iron oxide, and chips from a drum liner.
The hardness and size of the greases over rolled particles may damage the bearing surfaces which gives a noticeable increase in overall bearing noise but not to the degree that the bearing fatigue life is adversely affected. If grease is allowed with fingers there is a possibility the reagent will dissolve the grease and become contaminated so it can't be used with fingers.
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18.
The bonding in calcium nitrate is ionic, with Ca²+ and NO₂ ions present.
Using a diagram, or otherwise, explain how the ions interact with water when
forming a solution.
[2]
17.
(a) Explain the term electronegativity.
(b) The table gives some electronegativity values.
Atom
Electronegativity
Al
1-61
Be
1-57
H Mg
2-20 1-31
N
S
3.04 2-59
[1]
Select the two atoms from the list which would give the most polar bond when
[1]
combined.
Answer:
18
When calcium nitrate dissolves in water, the ionic bonds between the Ca²+ and NO₂ ions are broken due to the polarity of water molecules. The oxygen atoms of the water molecules have a partial negative charge while the hydrogen atoms have a partial positive charge. When Ca²+ ions are surrounded by water molecules, the partial negative charges on the oxygen atoms of water molecules interact with the positively charged Ca²+ ions through electrostatic attraction, forming a hydrated Ca²+ ion. Similarly, the partial positive charges on the hydrogen atoms of water molecules interact with the negatively charged NO₂ ions, forming hydrated NO₂ ions. The resulting solution consists of hydrated Ca²+ and NO₂ ions, dispersed evenly throughout the water.
17
(a) Electronegativity is a measure of an atom's ability to attract electrons towards itself when it is bonded to another atom. It is a relative scale, with the most electronegative element, fluorine, assigned a value of 4.0.
(b) The two atoms that would give the most polar bond when combined are Al and N. This is because they have the largest difference in electronegativity values, which is a measure of the polarity of a bond. The electronegativity difference between Al and N is 1.43, which is larger than any other combination of atoms given in the table
give the expected product of the following reaction.
We are given the benzaldehyde and it is treated with phosphorus ylide and we know when carbonyl group is reacted with phosphorus ylide there is formed alkene by remoing the O from carbonyl and attached the phosphorus ylide alkane part
Benzaldehyde is an aromatic compound with a distinct odour resembling almonds. It can be extracted from a variety of natural sources and can also be synthesised by liquid phase chlorination of toluene. There is no chemical distinction between these two types of benzaldehyde.Benzaldehyde is a widely used compound in the chemical industry. It also finds usage in several other items
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positive tests in the fermentation tests turned the test media from red to yellow. why does this color change occur?
The color change observed during fermentation tests, where the test media turns from red to yellow, is due to the production of acids by the fermenting microorganisms. '
Fermentation is a process where microorganisms, such as bacteria or yeast, break down carbohydrates into simpler compounds, usually alcohol and carbon dioxide, without using oxygen. During fermentation, these microorganisms produce organic acids, such as lactic acid, acetic acid, or formic acid, as byproducts.
The test media used in fermentation tests typically contain a pH indicator, such as bromothymol blue or phenol red, which changes color in response to changes in pH. These pH indicators are usually red when the pH is neutral or basic, but turn yellow when the pH becomes acidic. Therefore, when microorganisms ferment carbohydrates and produce acids, the pH of the test media decreases, causing the pH indicator to turn yellow.
For example, in the fermentation test for glucose, a carbohydrate source, bacteria such as Escherichia coli ferment glucose and produce acidic byproducts such as lactic acid and acetic acid. As these acids accumulate, the pH of the test media drops, and the pH indicator turns from red to yellow, indicating that fermentation has occurred.
In summary, the color change observed during fermentation tests from red to yellow is due to the production of acids by the fermenting microorganisms, which causes a decrease in pH, leading to the pH indicator changing color.
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Infer imagine having a unit cell of each type of crystal lattice composed of identical atoms. How would their densities compare? Explain your reasoning.
The arrangement of the atoms inside the unit cell will determine the densities of the various forms of crystal lattices made of identical atoms. Varying atom configurations in different crystal lattices can lead to varied densities.
Explain your reasoning.As an illustration, a straightforward cubic lattice only has atoms at the corners, and each corner atom is shared by eight unit cells. As the cube of the edge length determines the volume of the unit cell, the volume of the unit cell is equal to a3, where an is the length of the edge. As there is only one atom per corner, the unit cell contains one atom, and its mass is determined by the product of the number of atoms and the atomic mass. Hence, the density of a straightforward cubic lattice is
density = mass/volume = (atomic mass)/(a^3)
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What is the role of the primary standard in an acid-base titration? It serves as an unknown concentration that is determined using the secondary standard. It is used to find the stoichiometry of the titration reaction. O It is used to determine the unknown concentration of an acid or base that is more difficult to measure. It changes color to determine the equivalence point of a titration.
The primary standard is used to standardize the titrant solution (usually a strong acid or strong base) by reacting it with the primary standard to determine its exact concentration.
The primary standard is a substance used as a reference in the preparation of solutions for acid-base titrations. It is a highly pure and stable compound with a known molar mass and can be easily weighed and dissolved in solution to prepare a standard solution of known concentration. This allows for the accurate determination of the concentration of an unknown solution, such as an acid or a base, by titrating it with the standardized titrant solution. Therefore, the primary standard plays a crucial role in ensuring the accuracy of acid-base titrations.
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Identify the spectator ions in this reaction. Check all that apply.
H+ + CN + Li+ + OH → Lit + CN + H₂O
он+
O CN-
O Lit
OH-
H₂O
Answer:
The spectator ions are CN- and Li+
Explanation:
Spectator ions are ions in a chemical equation that don't participate in the reaction. To identify these ions you have to look for which ions are on both sides of the chemical equation.
In this chemical equation Li+ and CN- are on both sides of the equation making them spectator ions.
In general what did farmers and factory owners in the South use to transport their goods?
Farmers and factory owners in the South primarily used rivers and railroads to transport their goods.
The South had an extensive network of navigable rivers, such as the Mississippi, Tennessee, and Ohio, which made river transportation a practical and efficient means of moving goods to market. Steamboats were commonly used to transport agricultural products, such as cotton, tobacco, and sugar, downriver to ports on the Gulf of Mexico and the Atlantic Ocean. Railroads were also crucial to the transportation of goods, especially after the Civil War when railroads expanded across the South. The development of railroads facilitated the movement of goods between towns and cities, as well as the transportation of agricultural products from rural areas to urban markets.
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For each reaction order, identify the proper units for the rate constant, k. Not all of the choices will be used. Zero order First order Second order Third order Answer Bank M M M. ME
The rate constant k for a reaction of zero order is the ratio of concentration to time. The units for k in a zero-order reaction are M/s.The first-order reaction's rate constant k has the units of s-1. The units of k in a second-order reaction are M-1s-1. Finally, the units for k in a third-order reaction are M-2s-1.
For the zero order reaction, the units for the rate constant, k, are M/s (moles per second).
For the first order reaction, the units for the rate constant, k, are s-1 (per second).
For the second order reaction, the units for the rate constant, k, are M-1s-1 (moles per second squared).
For the third order reaction, the units for the rate constant, k, are M-2s-1 (moles squared per second).
The rate constant k varies based on the order of a reaction. For each reaction order, the appropriate units for the rate constant k are as follows:Zero order: M/sFirst order: s-1Second order: M-1s-1Third order: M-2s-1The rate law is given byRate = k[A]x[B]y[C]zWhere x, y, and z are the order of the reaction concerning the reactants A, B, and C, and k is the rate constant.
The rate constant k is unique for a particular reaction and has a fixed value for a given temperature.The reaction order determines the units of the rate constant k, which can be used to calculate the rate of reaction. The units of the rate constant k are given by the rate law's differential equation. For a reaction of order n, the differential equation of the rate law is:dn[A]/dt = -k[A]n
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Two objects are moving at the same speed. Which (if any) of the following statements about them are true? Check all that apply. The de Broglie wavelength of the heavier object is longer than that of the lighter one. If one object has twice as much mass as the other, its wavelength is one-half the wavelength of the other. Doubling the mass of one of the objects will have the same effect on its wavelength as does doubling its speed
The correct options are B and C i.e., if one object has twice as much mass as the other, its wavelength is half the wavelength of the other and doubling the mass of one of the objects will have the same effect on its wavelength as does doubling its speed.
An object's de Broglie wavelength will vary predictably as its mass or velocity changes.
The de Broglie wavelength of an object is given by the formula λ = h/p, where λ is the wavelength, h is Planck's constant, and p is the momentum of the object. Momentum is given by the formula p = mv, where m is the mass of the object and v is its velocity.
Given that two objects are moving at the same speed, their velocities are equal, and their momenta are directly proportional to their masses. Therefore, we can make the following observations about their de Broglie wavelengths:
The de Broglie wavelength of the heavier object is shorter than that of the lighter one. This is because the momentum of the heavier object is greater than that of the lighter one, and the de Broglie wavelength is inversely proportional to the momentum.
If one object has twice as much mass as the other, its wavelength is half the wavelength of the other. This is because the momentum of the heavier object is twice that of the lighter one, and the de Broglie wavelength is inversely proportional to the momentum.
Doubling the mass of one of the objects will have the same effect on its wavelength as does doubling its speed. This is because both changes result in a doubling of the momentum of the object, and the de Broglie wavelength is inversely proportional to the momentum.
In summary, the de Broglie wavelength of an object is inversely proportional to its momentum, which is directly proportional to its mass and velocity. Therefore, changes in the mass or velocity of an object will have a predictable effect on its de Broglie wavelength.
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what will happen to the ph of an acetic acid solution when chloride ion is added? group of answer choices ph increases ph decreases ph remains unchanged
When chloride ion is added to an acetic acid solution, the pH of the solution remains unchanged. Acetic acid is a weak acid, and its dissociation in water can be represented by the following equilibrium reaction:
CH3COOH (aq) + H2O (l) ⇌ CH3COO- (aq) + H3O+ (aq)
When chloride ions (Cl-) are added to the solution, they do not react with acetic acid, its conjugate base (acetate ion, CH3COO-), or hydronium ions (H3O+). Chloride ions are the conjugate base of a strong acid, hydrochloric acid (HCl), and are considered to be a non-reactive or inert ion in this context. Since the chloride ions do not participate in the reaction, they do not affect the equilibrium position or the concentrations of the species involved in the reaction.
As a result, the addition of chloride ions does not influence the pH of the acetic acid solution. The pH remains unchanged because the concentration of hydronium ions (H3O+), which determine the pH, is not altered by the presence of chloride ions.
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Why is carbon used to extract metals from their oxides
1-cheap
2- high_____
Because of its high reactivity, cheap cost, and versatility in the extraction procedure, carbon is used to extract metals from their oxides.
Carbon is commonly used as a reducing agent to extract metals from their oxides because of its high reactivity and low cost. When a metal oxide is heated with carbon, a reduction reaction occurs, with carbon atoms reacting with oxygen atoms to form carbon dioxide (CO2) and the metal atoms being reduced to their elemental form.
One of the main advantages of using carbon for this process is its high reactivity. Carbon has a strong affinity for oxygen, and as such, it readily reacts with metal oxides to reduce them. Carbon is also abundant and relatively cheap, making it a cost-effective reducing agent.
Additionally, the use of carbon as a reducing agent can be carried out in a range of conditions, such as in a blast furnace, making it a versatile method for extracting metals from their ores. This method is widely used in industry for the extraction of metals such as iron, zinc, and lead, among others.
In summary, carbon is used to extract metals from their oxides due to its high reactivity, low cost, and versatility in the extraction process.
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a graduate student wanted to perform this nucleophilic aromatic substitution, however the student added cyclopentadiene as a solvent. phenol was not formed. what was formed instead?
Nucleophilic aromatic substitution (NAS) is a type of reaction where a nucleophile substitutes a leaving group on an aromatic ring. In the presence of a strong nucleophile and an appropriate leaving group, phenol can be formed by NAS.
However, when cyclopentadiene is used as a solvent in NAS, it can act as a nucleophile itself and react with the electrophile, which results in the formation of a cyclopentadienyl cation. The cyclopentadienyl cation can then undergo various reactions, such as rearrangements and addition reactions with other nucleophiles, depending on the reaction conditions.
Therefore, in the presence of cyclopentadiene as a solvent, instead of phenol, other products such as cyclopentadiene adducts, rearranged cyclopentadienes, or other byproducts can be formed. It is important to carefully consider the choice of solvent in NAS reactions to ensure that it does not interfere with the desired reaction mechanism and does not lead to the formation of unwanted products.
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Calculate the enthalpy of
vaporization of benzene (C6H6) at 298.2 K. The standard enthalpy of
formation of gaseous benzene is +82.93 kJ.mol-¹. (b) Given that,
for liquid benzene, Cp.m = 136.1 J.mol-¹.K¯¹ and that, for gaseous
benzene, Cp,m = 81.67 J.mol-¹.K1, calculate the enthalpy of
vaporization of benzene at its boiling point (353.2).
The enthalpy of vaporization of benzene at 298.2 K is 30.8 kJ/mol.
The enthalpy of vaporization of benzene at its boiling point
33.06 kJ/mol
Steps(a) To calculate the enthalpy of vaporization of benzene at 298.2 K, we can use the Clausius-Clapeyron equation:
ln(P2/P1) = -(ΔHvap/R)(1/T2 - 1/T1)
where P1 and P2 are the vapor pressures of benzene at two different temperatures (in this case, we will use the normal boiling point of benzene, 353.2 K, and the temperature given in the problem, 298.2 K), ΔHvap is the enthalpy of vaporization we want to calculate, R is the gas constant (8.314 J/mol.K), and T1 and T2 are the corresponding temperatures in Kelvin.
Using the standard enthalpy of the formation of gaseous benzene, we can calculate the standard enthalpy of vaporization of benzene at 298.2 K:
ΔHvap = ΔHf°(g) - Cp,mΔT
Plugging in the values given in the problem, we get:
ΔHvap = (82.93 kJ/mol) - (81.67 J/mol.K)(353.2 K - 298.2 K)
ΔHvap = 30.8 kJ/mol
Therefore, the enthalpy of vaporization of benzene at 298.2 K is 30.8 kJ/mol.
b. To calculate the enthalpy of vaporization of benzene at its boiling point, we can use the following formula:
ΔHvap = ΔH°fus + ΔH°vap
where ΔH°fus is the enthalpy of fusion and ΔH°vap is the enthalpy of vaporization.
First, we need to calculate the enthalpy of fusion:
ΔH°fus = ΔH°f(g) - ΔH°f(l)
ΔH°fus = 82.93 kJ/mol - 32.04 kJ/mol
ΔH°fus = 50.89 kJ/mol
Next, we can calculate the enthalpy of vaporization at the boiling point:
ΔH°vap = ΔH°v(g) - ΔH°v(l)
We can assume that the entropy change during vaporization is constant, so we can use the following equation to relate the enthalpy change to the temperature change:
ΔH°vap = ΔS°vap × (Tb - T)
where ΔS°vap is the standard entropy change of vaporization, Tb is the boiling point of benzene, and T is the temperature at which we know the heat capacity.
At 298.2 K, we know that:
ΔS°vap = ΔS°g - ΔS°l
ΔS°vap = 269.9 J/mol·K - 173.2 J/mol·K
ΔS°vap = 96.7 J/mol·K
Using this value, we can calculate the enthalpy of vaporization at the boiling point:
ΔH°vap = ΔS°vap × (Tb - T) + Cp,m × (Tb - T)
ΔH°vap = 96.7 J/mol·K × (353.2 K - 298.2 K) + 81.67 J/mol·K × (353.2 K - 298.2 K)
ΔH°vap = 33.06 kJ/mol
Therefore, the enthalpy of vaporization of benzene at its boiling point
33.06 kJ/mol
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Suppose your sample of magnesium was contaminated with an equal weight of MgCl2. How would the contamination affect the change in enthalpy for the Mg–HCl reaction? Justify your answer
when sodium chloride dissolves in water, how do the water molecules orient around the ions? question 6 options: a) the oxygen atoms point toward the sodium ions, and the hydrogen atoms point toward the chloride ions. b) the hydrogen atoms point toward both the sodium and the chloride ions. c) the oxygen atoms point toward both the sodium ions and the chloride ions. d) the hydrogen atoms point toward the sodium ions, and the oxygen atoms point toward the chloride ions. e) water molecules are randomly oriented around the ions.
When sodium chloride dissolves in water, water molecules orient around the ions in such a way that the hydrogen atoms point toward the chloride ions. The correct option is b.
When sodium chloride (NaCl) dissolves in water, it separates into [tex]Na^+[/tex] and [tex]Cl^-[/tex] ions. As a result, water molecules surround the ions, shielding them from one another. Water molecules are orientated around the ions in such a way that their hydrogen atoms (δ+) are directed toward the chloride ions ( [tex]Cl^-[/tex]) and their oxygen atoms (δ-) are directed toward the sodium ions ([tex]Na^+[/tex]).
A water molecule has two positively charged hydrogen atoms and one negatively charged oxygen atom that form a V-shaped geometry, with the oxygen atom at the vertex. The H-O-H bond angle is 104.5 degrees. As a result, when[tex]Na^+[/tex] and [tex]Cl^-[/tex] ions are present in water, they are surrounded by water molecules, with their hydrogen atoms pointed toward the [tex]Cl^-[/tex] and their oxygen atoms pointed toward the [tex]Na^+[/tex] .
In summary, when sodium chloride dissolves in water, the water molecules orient around the ions in such a way that the hydrogen atoms point toward the chloride ions. The correct option is b.
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How many moles exist in 390 g of silver nitrate (AgNO3)? 2
Answer:
The formula AgNO3 gives us 1 Ag atom,
1 N atom and
3 oxygen atoms.
From the periodic table we get the atomic mass of each of these atoms:
Ag 108 g/mol,
N 14.0 g/mol,
O 16.0 g/mol
For each atom, mutiply the number of atoms by its atomic mass, and then sum the values:
molar mass of
AgNO3 = (1 x 108) + (1 x 14.0) + (3 x 16.0) = 170 g/mol
So now let’s return to our four step process to solve the problem.
Here’s the updated data:
n = ? mol,
m = 80.00 g,
M = 170 g/mol
Here’s the formula: n = m / M
Now, substitute the data values into the formula:
n = 80.00 / 170
And calculate the answer: n = 0.4705882353 mol
Rounding the answer to 3 significant figures:
the amount of AgNO3 in 80.00 grams is 0.471 molDO MARK AS BRAINLIEST
The following two compounds can be distinguished by
OH CH-CH
CH-OH
and
Neutral FeCl3
NaOl/OH
O Aq. AgNO3
Na
The two compounds can be distinguished by their chemical properties and reactivity with different reagents.
The first compound has an alcohol functional group (-OH) attached to a carbon-carbon double bond (-CH=CH-), while the second compound has an alcohol group (-OH) attached to a carbon atom that is bonded to an oxygen atom (-CH-OH). These two compounds can be distinguished by their different molecular structures and chemical properties, which can affect their solubility, acidity, and reactivity with other chemicals.
The second compound can be distinguished from the first compound and neutral FeCl₃ by its reaction with NaOH or NaOl. NaOH or NaOl reacts with the second compound to produce a yellow-orange color due to the formation of a complex between iron(III) ions and the phenolic group in the compound. Neutral FeCl₃ also reacts with the phenolic group, but it produces a dark green color instead. This difference in color can be used to distinguish the two compounds.
Finally, the second compound can also be distinguished from the first compound by its reaction with aqueous AgNO₃. The second compound can react with AgNO₃ to form a white precipitate, while the first compound does not react with AgNO₃. This is due to the presence of the phenolic group in the second compound, which can form a silver phenoxide precipitate.
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oxides of copper include cuo and cu2o. you heat 1.51 g of one of these copper oxides in the absence of air and obtain 1.21 g of cu. true or false: you must have had cuo.
1. What is the pH of a solution where 50.0 mL of 0.050 M NH3 is mixed with 12.0 mL of 0.10 M hydrobromic acid (HBr)? (Kb = 1.8 * 10-5)
Round your answer to two decimal places.
2. What is the pH at the ½ equivalence point? (Kb = 1.8 * 10-5)
1. The pH of the solution is 9.18, 2. pH at the half-equivalence point is 9.74.
1. When 50.0 mL of 0.050 M NH₃ is mixed with 12.0 mL of 0.10 M HBr, the moles of NH₃ and HBr are 0.0025 mol and 0.0012 mol respectively. Since HBr is a strong acid, it will react completely with NH₃ to form NH₄Br. The remaining NH₃ will undergo hydrolysis to form NH₄⁺ and OH⁻ ions.
The Kb expression for NH₃ is: Kb = [NH₄⁺][OH⁻]/[NH₃].
Rearranging this expression and solving for [OH⁻], we get [OH⁻] = √(Kb[NH₃]). Substituting the values, we get [OH⁻] = √(1.8 x 10⁻⁵ x (0.0025-0.0012)/(50+12) x 10⁻³) = 1.3 x 10⁻⁵ M.
The pOH of the solution is -log[OH⁻] = -log(1.3 x 10⁻⁵) = 4.89. The pH of the solution is 14 - pOH = 14 - 4.89 = 9.18.
2. The pH at the half-equivalence point is equal to the pKa of the conjugate acid of the base (NH₄⁺ in this case). The pKa can be calculated using the relationship pKa + pKb = pKw = 14. Substituting the value of pKb, we get pKa = 14 - pKb = 14 - (-log(1.8 x 10⁻⁵)) = 9.74. So, the pH at the half-equivalence point is 9.74.
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Boric acid is a triprotic acid that is used as an ant and roach killer. A 1.42-g sample of boric acid is neutralized
by 157 mL of 0.4388 M NaOH. Determine the molar mass (g/mol) for boric acid.
H2A+ 3 NaOH
NajA+ 3 H2O
The correct answer is The balanced chemical equation for the neutralization reaction between boric acid [tex](H2A)[/tex] and sodium hydroxide [tex](NaOH)[/tex]is:
[tex]H2A + 3 NaOH → Na3A + 3 H2O[/tex]
From the balanced equation, we can see that one mole of boric acid reacts with three moles of sodium hydroxide. Therefore, we need to find the number of moles of sodium hydroxide used to neutralize the given sample of boric acid, and then use the stoichiometry of the balanced equation to determine the number of moles of boric acid. The number of moles of NaOH used can be calculated as follows: moles of NaOH = (concentration of NaOH) x (volume of NaOH used) moles of NaOH = (0.4388 mol/L) x (0.157 L) moles of NaOH = 0.06886 mol According to the stoichiometry of the balanced equation, three moles of NaOH are required to neutralize one mole of boric acid. Therefore, the number of moles of boric acid can be calculated as: moles of H2A = (1/3) x (moles of NaOH) moles of H2A = (1/3) x (0.06886 mol) moles of H2A = 0.02295 mol The molar mass of boric acid can now be calculated using the formula: molar mass (g/mol) = (mass of sample) / [tex](moles of H2A)[/tex]Substituting the given values, we get: molar mass (g/mol) = (1.42 g) / (0.02295 mol) molar mass (g/mol) = 61.95 g/mol Therefore, the molar mass of boric acid is 61.95 g/mol.
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g 50.0 g of ice at -22.0 are added to 120.0 g of water at 7.0 in an insulated container. (a) what will be the temperature when thermal equilibrium is reached? (b) how mass of ice will be present when equilibrium is reached?
a) The temperature of the system when thermal equilibrium is reached will be 0°C.
b) 30 g of ice will be present when thermal equilibrium is reached.
mass of ice (m1) = 50.0 g
Temperature of ice (T1) = -22.0°C
Mass of water (m2) = 120.0 g
Temperature of water (T2) = 7.0°C
The energy required to melt the ice is given by the equation,
Q1 = m1 × Lf
Where, Lf is the latent heat of fusion of ice = 334 J/g
Q1 = 50.0 × 334Q1 = 16700 J
The energy required to heat the ice from -22°C to 0°C (Q2) is given by,
Q2 = m1 × c × (0-(-22))
Where, c is the specific heat capacity of ice = 2.06 J/g°C
Q2 = 50.0 × 2.06 × 22Q2 = 2266 J
The energy lost by water (Q3) is given by the equation,
Q3 = m2 × c × (7 - 0)
Where, c is the specific heat capacity of water = 4.184 J/g°C
Q3 = 120 × 4.184 × 7Q3 = 35244.48 J
Total energy gained (Q4) by ice and water is equal to the energy lost by the water.
Q4 = Q1 + Q2
Q4 = 16700 + 2266
Q4 = 18966 J
18966 = Q3 = m2 × c × (7-0)
18966 = 120 × 4.184 × 7
m2 = 18966/(120 × 4.184 × 7)
m2 = 3.03 g
At equilibrium, the mass of the remaining ice (m3) can be calculated as follows,
Q1 + Q2 = m3 × Lf + m3 × c × (0 - 0°C)
16700 + 2266 = m3 × 334 + m3 × 2.06 × (0 - (-22))
m3 = 30 g
Therefore, the temperature of the system when thermal equilibrium is reached will be 0°C, and the mass of the ice remaining at equilibrium will be 30 g.
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a 53 year-old known alcoholic presents with agitation, vomiting and altered mental status. his fingerstick glucose is 148. his serum ethanol level is undetectable and his head ct is normal. an abg shows a ph of 7.21, pco2 of 34, po2 of 98 on room air. his basic chemistry panel includes a sodium of 136, potassium 4.1, chloride 108, bicarbonate 14, bun 12, creatinine 1.1. what substance are you concerned that he may have ingested
Based on the patient's age, symptoms, and laboratory results, the substance that the patient may have ingested is methanol. It is because the patient presents with altered mental status, vomiting, and a pH of 7.21.The substance are you concerned that he may have ingested is methanol.
The patient's basic chemistry panel shows a low bicarbonate level, which is a sign of metabolic acidosis. Methanol poisoning can be confirmed by measuring the serum levels of methanol. Methanol is an organic solvent that is commonly found in antifreeze, fuel, and solvents, it can be ingested accidentally or intentionally. Methanol is rapidly absorbed and metabolized in the liver to formaldehyde and formic acid, which causes severe metabolic acidosis.
Methanol is an organic solvent that is present in several substances, such as antifreeze, fuel, and solvents. Methanol poisoning can cause metabolic acidosis, which is an abnormal condition that results from an increase in the body's acidic levels. A patient presenting with a pH of 7.21, low bicarbonate levels, altered mental status, and vomiting should be suspected of methanol poisoning. The low bicarbonate level is a sign of metabolic acidosis and methanol poisoning is diagnosed by measuring the serum levels of methanol. Treatment for methanol poisoning includes supportive care, hemodialysis, and administration of fomepizole, an antidote that inhibits the metabolism of methanol. If left untreated, methanol poisoning can lead to blindness, seizures, and even death.
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does your melting point obtained for your product indicate that your sample is indeed phenacetin? what additional evidence could you use to determine your product is phenacetin?
The melting point obtained for the product is an indication that the sample is phenacetin. To determine that the product is phenacetin, other supporting evidence may include elemental analysis and infrared spectroscopy
Melting point tests are utilized in the identification and characterization of organic compounds. The melting point of a sample is determined by heating it at a steady rate until it begins to liquefy, and the temperature at which it starts to melt is taken as the melting point of the sample. The melting point of a solid, including phenacetin, is usually given in reference books.
The fact that the sample has the same melting point as that given for phenacetin in reference books suggests that it is indeed phenacetin. To further confirm that the product is phenacetin, additional tests such as elemental analysis or infrared spectroscopy could be carried out. These tests can provide additional evidence to support the identification of the product.
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what will usually happen to the precipitated over time?
Answer:
Precipitation falls to the ground as snow and rain. It eventually evaporates and rises back into the atmosphere as a gas. In clouds, it turns back into liquid or solid water, and it falls to Earth again.
Explanation:
Answer:
Precipitation is the process of a compound coming out of solution. It is the opposite of dissolution or solvation. In dissolution, the solute particles separate from each other and are surrounded by solvent molecules. In precipitation, the solute particles find each other and form a solid together
Assume that 0.950g of KHT (potassium hydrogen tartrate) are dissolved in 25.00mL of solution.KHT -> K++ HT-a) calculate the solubility of KHT for these conditions in g KHT / L of solutionb) Calculate the solubility of KHT for these conditions in mol KHT / L of solutionc) Determine [K+] and [HT-] in this solution. If the temperature is Tp, a trace of solid is present and the reaction is at equilibrium. Determine Ksp at this temperature
a) Solubility (g KHT/L) = (0.950 g KHT) / (0.025 L) = 38 g KHT/L
b) Solubility (mol KHT/L) = (38 g KHT/L) / (188.18 g/mol) = 0.202 mol KHT/L
c) [K+] = [HT-] = 0.202 mol KHT/L
d) Ksp = (0.202)(0.202) = 0.0408
A more detailed explanation of the answer.
a) To calculate the solubility of KHT in g KHT/L of solution, follow these steps:
1. Convert the volume of the solution to liters: 25.00 mL = 0.025 L
2. Calculate the solubility by dividing the mass of KHT by the volume of the solution:
Solubility (g KHT/L) = (0.950 g KHT) / (0.025 L) = 38 g KHT/L
b) To calculate the solubility of KHT in mol KHT/L of solution, follow these steps:
1. Determine the molar mass of KHT (K = 39.10 g/mol, H = 1.01 g/mol, C = 12.01 g/mol, O = 16.00 g/mol):
Molar mass of KHT = K + 2*(C + H + 2*O) = 39.10 + 2*(12.01 + 1.01 + 2*16.00) = 188.18 g/mol
2. Convert the solubility from g KHT/L to mol KHT/L:
Solubility (mol KHT/L) = (38 g KHT/L) / (188.18 g/mol) = 0.202 mol KHT/L
c) To determine [K+] and [HT-] in this solution, follow these steps:
1. Since KHT dissociates into K+ and HT-, the concentrations of K+ and HT- will be equal to the solubility of KHT in mol KHT/L:
[K+] = [HT-] = 0.202 mol KHT/L
As there is a trace of solid present and the reaction is at equilibrium, we can determine the Ksp at this temperature by following these steps:
1. Write the balanced chemical equation for the dissociation of KHT: KHT (s) <-> K+ (aq) + HT- (aq)
2. Write the expression for the Ksp: Ksp = [K+][HT-]
3. Plug in the concentrations calculated earlier: Ksp = (0.202)(0.202) = 0.0408
So, at this temperature (Tp), the Ksp for KHT is 0.0408.
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a chemist has 30% and 50% solutions of acid available. how many liters of each solution should be mixed to obtain 57.5 liters of 38% acid solution?
The volume of 30% acid solution that we need is 34.5 liters and 23 liters of 50% solution should be mixed to obtain 57.5 liters of 38% acid solution.
Let's assume that the amount of the 30% solution that we need is x. Therefore, the amount of 50% solution that we need will be (57.5 - x).
The following is the method to determine the exact volume of each solution that is needed.
30% solution: x liters
50% solution: (57.5 - x) liters
38% solution: 57.5 liters
We will now apply the formula to find the exact amount of each solution that is needed.
Volume of Acid in 30% solution + Volume of Acid in 50% solution = Volume of Acid in 38% solution
0.3x + 0.5(57.5 - x) = 0.38(57.5)0.3x + 28.75 - 0.5x = 21.85-0.2x = -6.9x = 34.5
Therefore, the volume of 30% acid solution that we need is 34.5 liters, while the volume of 50% acid solution that we need is 57.5 - 34.5 = 23 liters.
Therefore, 34.5 liters of 30% solution and 23 liters of 50% solution should be mixed to obtain 57.5 liters of 38% acid solution.
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he three radioactive series that occur in nature end with what element? the three radioactive series that occur in nature end with what element? bi pb po hg u g
The three radioactive series that occur in nature end with three different elements. These elements are Bismuth (Bi), Lead (Pb), and Polonium (Po). The correct options are a, b, and c.
Bismuth (Bi) is the most stable element of the three and has a half-life of 19 billion years. Lead (Pb) is the next most stable, with a half-life of 22 million years. Polonium (Po) has the shortest half-life of the three, at only 138 days.
Radioactive decay is the process by which an unstable atom loses energy. During this process, the atom's nucleus splits into two or more parts, releasing gamma rays, subatomic particles, or alpha and beta particles. Radioactive decay also causes the atom to transmute into a different element.
When atoms of an unstable element undergo radioactive decay, they move along a decay chain, forming a series of different elements. The three radioactive series that occur in nature all start with Uranium and Thorium and end with Bismuth, Lead, and Polonium. These are known as the Uranium-238, Thorium-232, and Actinium-228 series, respectively.
In conclusion, the three radioactive series that occur in nature end with Bismuth (Bi), Lead (Pb), and Polonium (Po).
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) the student proposes to perform another titration using a 0.139 g sample of h2c2o4 , but this time using 0.00143 m kmno4(aq) in the buret. would this titrant concentration be a reasonable choice to use if the student followed the same procedure and used the same equipment as before? justify your response.
If the student followed the same procedure and used the same equipment as before, then 0.00143 M [tex]KMnO_{4}[/tex](aq) in the burette would not be a reasonable choice for a titrant concentration.
Thus, the correct answer is "No, it would not".
The reаson why 0.00143 M [tex]KMnO_{4}[/tex](аq) in the burette would not be а reаsonаble choice for а titrаnt concentrаtion is the molаrity of the [tex]KMnO_{4}[/tex] the solution in the burette must be increаsed to decreаse the volume of the solution required for oxidаtion. This is becаuse oxаlic аcid, which is а weаk orgаnic аcid, requires а strong oxidizing аgent such аs [tex]KMnO_{4}[/tex] to reаct.
It is importаnt to note thаt а minimum of 5-6 mL of [tex]KMnO_{4}[/tex] is required for the complete oxidаtion of 0.1 grаms of oxаlic аcid. Аs а result, if the concentrаtion of [tex]KMnO_{4}[/tex] is decreаsed, more [tex]KMnO_{4}[/tex] will be required to complete the oxidаtion of [tex]H_{2}C_{2}O_{4}[/tex]H2C2O4. Аs а result, а higher volume of the solution would be required to reаch the endpoint.
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7. the mass percent of phosphoric acid in cola has been reported to be 0.075y mass. how does your answer compare to this value (use percent difference to make this comparison)?
To compare your answer to the reported mass percent of phosphoric acid in cola (0.075y mass), use the percent difference formula:
Percent Difference = (|Your Value - Reported Value| / (Your Value + Reported Value) / 2) * 100
1. Insert the calculated mass percent of phosphoric acid in place of "Your Value" in the formula.
2. Substitute 0.075y mass for "Reported Value".
3. Calculate the absolute difference between your value and the reported value.
4. Divide the absolute difference by the average of your value and the reported value.
5. Multiply the result by 100 to get the percent difference.
By following these steps, compare the answer to the reported mass percent of phosphoric acid in cola using percent difference.
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write the balanced equation for the reaction in which aluminum is added to aqueous manganese(ii) sulfate. you do not need to include states of matter in your answer.