The quantity of energy required to convert 0.562 kg ice at -20.0°C to steam at 250°C is equal to 1885.4 KJ.
What is the specific heat capacity?The specific heat capacity can be described as the amount of energy needed to raise the temperature in one unit of material by one-degree celsius.
The addition or emission of heat from the system will the temperature of the substance will be changed:
Q = mCΔT
Given, the amount of ice, m = 0.562 Kg = 562 g
The change in the temperature = 100 -20 = 80°C
The specific heat capacity of the water, C = 4.18J/g°C
The specific heat capacity of the ice, C = 2.03 J/g°C
The phase transition from ice to steam:
H₁ = 562 × 2.03 × (0-(-20))
H₁ = 22,817 J = 22.8 KJ
The enthalpy of the fusion will be absorbed:
H₂ = n × H(fus)
The number of moles of water = 562/18 = 31.22 mol
H₂ = 31.22 × 6.02 kJ/mol
H₂ = 187.95 KJ
Phase transition from water at 0°C to water at 100°C:
H₃ = 562 × 4.18 × 100
H₃ = 234 KJ
The phase transition from water at 100°C to steam at 100°C:
H₄ = n × H(vap)
H₄ = 31.22 × 40.7 kJ/mol
H₄ = 1270.65 KJ
The heat to make steam at a temperature of 250°C:
H₅ = m × S×ΔT
H₅ = 562 × 2.02 ×150 = 170 KJ
The total energy needed to convert 0.562 kg ice at -20.0°C to steam at 250.0°C:
H = H₁ + H₂+ H₃+ H₄ +H₅
H = 1885.4 KJ
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Write down the colours of the precipitates formed by reaction of aqueous caustic soda with solutions of: copper, zinc and ferric salts.
Answer:
Metal Color
Cobalt Pink (when hydrated)
Copper Blue
Iron (II) Green pale
Iron (III) Reddish brown
How many moles are in 7.46 x 1025 particles of iron
Answer:
1 mole of iron =6.023×10^23 particles
1 particles of iron=1/6.023×10^23 mole
7.46×10^25 particles =1/6.023×10^23×7.46×10^25
=1.238×10^48 mole is a required answer.
A chemist prepares a solution of magnesium bromide by measuring out of into a volumetric flask and filling to the mark with distilled water. Calculate the molarity of anions in the chemist's solution.
The assumed or arbitrary molarity of anions in the chemist's solution is found out to be 2.17 M.
Since neither the mass of magnesium bromide and the volume of the volumetric flask are not given, one can assume arbitrary values and you could modify them whenever you want, thus, let 50.0g of magnesium bromide to be the measured out amount of solute and a 250-mL volumetric flask where the solution is prepared, so the final volume of the solution is 250 mL after the addition of distilled water. In this manner, the bromide anions moles, taking into account there are two bromide moles per magnesium bromide moles giving the value of 0.543 mols.
The molarity can be calculated as follows:
M= 0.543 mol Br-/0.250 L= 2.17 M
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The extended structure of sodium chloride (NaCl) is shown.
Which of the following describes the configuration of Layer 4 of the sodium chloride crystal?
OPTIONS
A
It will be identical in all of its characteristics to Layer 1.
B
It will contain 4 atoms of chlorine and 5 atoms of sodium.
C
It will have chlorine atoms in all four of its corners.
D
It will have sodium that are bonded only to other sodium atoms.
Sodium chloride crystal will contain 4 atoms of chlorine and 5 atoms of sodium. Therefore, option B is correct.
What is sodium chloride?In sodium chloride, each ion is usually surrounded by 6 ions of the opposite charge. The surrounding ions are positioned at the vertices of a regular octahedron.
In the language of close-packing, the larger chloride ions are arranged in a cubic array whereas the smaller sodium ions fill all the cubic gaps between them.
The basic structure is commonly known as the halite or rock-salt crystal structure. It can be represented as a face-centered cubic lattice with a two-atom basis or as two face centered cubic lattices. The one atom is located at lattice point, and the second atom is located halfway between lattice points along edge of the fcc unit cell.
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absorbance is directly proportional to ___________________________.
The concentration which determines how much radiation is absorbed, increases together with the absorbance.
One factor that influences a sample's absorbance is concentration (c). It would be reasonable to suppose that more radiation will be absorbed as the concentration rises, raising the absorbance. As a result, the relationship between concentration and absorbance is straightforward.
Another component is the path length (b). The absorbance rises as the length of the radiation beam and the number of molecules in its path do as well. As a result, the concentration is inversely related to the distance traveled. As you are undoubtedly already aware from earlier experiences, a particular chemical species absorbs some wavelengths of radiation but not others.
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The complete question as follows
Why is absorbance directly proportional to concentration?
The piston in the engine of a car converts the energy released by octane combustion into mechanical work that turns the crankshaft. Some of the energy is lost to the environment as heat. What are the appropriate signs on q and w for this process
Thermal energy is transformed into kinetic energy that is, the energy of a moving object in this example, the moving piston by the engine. So, the sign of heat is negative and work done is negative.
A complicated device known as a combustion engine consumes fuel to produce thermal energy, which is subsequently used to drive tasks. In a car, the engine is responsible for generating the kinetic energy needed to turn the wheels. An internal combustion engine is the type of combustion engine used in automobiles. Internal-combustion engines are those found in gasoline or diesel-powered automobiles. Such an engine obtains its power from the heat produced during the combustion of the working fluids that have not yet reacted, the oxidizer-fuel mixture. As the heat is released to convert into the kinetic energy the sign of heat is negative and the sign of work done by the internal combustion of vehicles is negative.
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The reaction in which H2O(l) is decomposed into H2(g) and O2(g) is thermodynamically unfavorable (ΔG°>0). However, an electrolytic cell, such as the one represented above, can be used to make the reaction occur. Which of the following identifies a flaw in the representation?
Answer:
B) The equation for the reaction is not correctly balanced.
Explanation:
The decomposition of the water molecule in the hydrogen and the oxygen atoms are carried by the electrolytic cell. The equation for the reaction given is unbalanced.
What is a decomposition reaction?The decomposition reaction is given as the reaction in which the compound is degraded into the constituent ions.
The electrolytic cell functions in the breakdown of water to hydrogen and oxygen with the application of the electric current.
The balanced equation for the decomposition of water is:
[tex]\rm 2\;H_2O(l)\;\rightarrow\;4\;H_2(g)\;+\;2\;O_2(g)[/tex]
The flaw in the given reaction is the decomposition is the unbalanced chemical equation.
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Select all of the following which are characteristics of metals.
Metals are poor conductors of heat and electricity.
Metallic elements tend to lose electrons to form cations.
Metals have luster.
Metals are mallceable.
Most metallic elements are solids at room temperature.
Answer: Metals are malleable. Most metallic elements are solids at room temperature.
Explanation:
Answer: all expect the first one
Explanation:
So they are luster, they are malleable they tend to lose electrons to form cation(positive ions) and they turn soild at room temperature
What is the formula for triphosphorus tetrasulfide?
Answer:
P3S4
Explanation:
hope this helps
4. How many molecules are in 32.6 grams of potassium oxide?
a. Go from grams to moles
b. Then moles to molecules
2.084*10^23 molecules are in 32.6 grams of potassium oxide.
What Is Molar mass ?A chemical's molar mass is its weight in grammes for one mole. A mole is a unit used to measure how many atoms, molecules, and ions are present in a substance. The number of molecules in a mole of any substance is 6.022 x 1023.
Although the terms "molecular mass" and "formula mass," which refer to molar mass specifically for molecular compounds, are frequently used interchangeably, their definitions vary according to the most reputable sources.
Molar mass of K2O is 94.196g
Given mass = 32.6g
1 mole of K2O = 94.196g
So, 32.6g will be 32.6/94.196g
i.e. 0.346moles
1 mole of K2O = 6.023*10^23molecules of
0.346moles will be 2.084*10^23 molecules
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What forces are acting on a meter stick?
Whenever the meter stick stood by itself, two forces were acting on it: some upward pressure of the fulcrum as well as the descending gravity force.
To demonstrate that the resultant force was zero when the metre stick has been in equilibrium, you must balance forces acting on it in the first section. To figure out the mass of the meter stick, you should balance the metre stick's weight against with a known weight inside the second section.
In the event that the ruler was balanced, the support which it is resting applies a force equal in strength to that of the weight's opposite force. Therefore, the ruler is being acted upon by its weight as well as the friction coefficient somewhere at support.
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How do you calculate grams to molecules?
What could occur if the feedback loop of the knee je rk reflex was cut off at any points along its path?
If the feedback loop of the knee reflex was cut off at any points along its path, then there will be no response of knee reflex.
What does it mean if you don't have a knee reflex?Its results in harm to any part of your reflex arc, which can be due to a basic knee-medicinal condition. Healthcare suppliers can disclose hyporeflexia by spouting your knee with a rubber hammer.
If your doctor taps on a band and there isn't a reflexive movement in the muscle, it's a sign of knee-health matter. Usually, absent reflexes are created by an issue with the nerves in the tendon and muscle. You may have other muscle symptoms along with areflexia, like weakness, or atrophy.
So we can conclude that A decline reflex reply can be related to peripheral knee-nervous system disorders.
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The half-life of titanium-44 is 60.0 y. A sample of titanium contains 0.600 g of titanium-44. How much remains after 100.0 y
The amount of titanium-44 remaining will be 1/4 of the original amount, or 0.150 g.
What is amount?Amount is a quantity or magnitude of something, typically money. For example, a person may refer to the "amount of money" they have saved, the "amount of time" it takes to do something, or the "amount of food" they have purchased. Amount can also refer to the total number of something, such as the "amount of people" who have attended an event or the "amount of work" that needs to be done.
The half-life of titanium-44 is 60.0 y, meaning that after every 60.0 y, the amount of titanium-44 will be halved.
0.600 g - 0.150 g = 0.450 g
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Can someone plz help me with this because I do not understand it ASP
Answer:
I'm not the best at chemistry but from what I remember you need to balance the equation and you need the arrows. It wants you to use double displacement and so thats the definition im assuming.
Explanation:
An example would be
Na2SO4 + SrCl2 --> 2 NaCl + SrSO4
This is a balanced equation.
https://en.intl.chemicalaid.com/tools/equationbalancer.php
This link will help you balance an equation.
Hopefully this helps I appologize if it doesn't.
Identify the phrases that generally apply to molecular compounds. A. Contains metals and nonmetals B. Are often fades or liquids C. Have low melting points D. Contain ionic bonds E. Use covalent bonding
Answer is option C) Have low melting points.
Explanation:
As is common knowledge, small molecules make up molecular compounds, and these small molecules are held together by an intermolecular force. The intermolecular tensions in this situation are incredibly weak and simple to overcome when breaking it. Therefore, molecular compounds have low melting and boiling points because of weak intermolecular interactions.
What are molecular compounds?Chemical substances known as molecular compounds assume the shape of distinct molecules. Examples include common substances like carbon dioxide and water. These substances differ significantly from ionic substances like sodium chloride. When metal atoms give up one or more of their electrons to nonmetal atoms, ionic compounds are created. The resultant cations and anions are drawn to one another electrostatically.
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решите пожалуйста срочно!!!
Answer:
what language is this
Bulgarian?
translate into English
H+ ions increase in concentration at lower pH values. Calculate how many more H+ ions there are in a solution at a pH = 2 than in a solution at a pH = 6. Find the concentration of H+ ions at a pH = 2 and at a pH = 6 in Table B. Then divide the concentration of H+ ions at a
pH = 2 by the of H+ ions at a pH = 6. Record your answer in Table C.
What is the concentration of H+ ions at a pH = 2?
mol/L
What is the concentration of H+ ions at a pH = 6?
mol/L
How many more H+ ions are there in a solution at a
pH = 2 than in a solution at a pH = 6?
need ASAP give
brainliest
The number of hydrogen ions, H⁺, that are there in a solution at a
the pH of 2 than in a solution at a pH of 6 is 1000 or 10⁴.
What is the pH of a solution?The pH of a solution is the negative logarithm in base 10 of the hydrogen ion concentration of the solution.
pH = - log [H⁺]
Hence, the hydrogen ion concentration of a solution whose pH is given is determined using the formula given below as follows:
[tex][H^{+}] = 10^{-pH}[/tex]
For the solution of pH of 2
[H⁺] = 10⁻²
[H⁺] = 0.01 M
For the solution of pH of 6
[H⁺] = 10⁻⁶
[H⁺] = 0.000001 M
The ratio of the hydrogen ion concentration of the solutions will be:
Ratio of hydrogen ions = 0.01 / 0.000001 M
Ratio of hydrogen ions = 10000 or 10⁴
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What element will lose electrons to form
An ion
Answer:
elements which are basic in nature or we can say that it is a metal so we conclude that it will loose electron or to form an ions
What coefficient for O2 demonstrates the law of conservation of mass?
CH (9) + _02(g) → CO2(g) + 2H2O(g)
Answer:
2
Explanation:
The coefficient for O is 2 and this is an example of a combustion reaction. With the help of the coefficient 2 infront of oxygen, this equation now demonstrates law of conservation of mass.
The coefficient for O₂ that demonstrates the law of conservation of mass is
2.
The law of conservation of mass states that mass can neither be created
nor destroyed but can be transformed from one form to another.
The mass of the reactant and the mass of the product should be equal.
Therefore, let's balance the equation
CH4 (g) + 0₂(g) → CO₂(g) + 2H₂O(g)
For the equation to be balanced the masses of each molecules on both
sides will be the same .
Therefore,
CH4 (g) + 20₂(g) → CO₂(g) + 2H₂O(g)
The coefficient of 2 for O₂ will balance the masses of oxygen on both
sides of the chemical equation.
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Determine the equilibrium constant Kc and the reaction quotient Qc for a reversible reaction.
Answer:
Explanation:
The equilibrium constant (Kc) is a measure of the relative concentrations of the reactants and products at equilibrium for a given chemical reaction. It is defined as the ratio of the product concentrations raised to their stoichiometric coefficients, to the reactant concentrations raised to their stoichiometric coefficients. For a general reversible reaction
aA + bB <=> cC + dD
The equilibrium constant is defined as:
Kc = [C]^c [D]^d / [A]^a [B]^b
where [X] represents the concentration of species X (in molarity units), and the superscripts on the concentrations represent the stoichiometric coefficients of the species in the balanced equation for the reaction.
The reaction quotient (Qc) is similar to the equilibrium constant, but it is calculated using the concentrations of the reactants and products at a given point in time, rather than at equilibrium. The reaction quotient is also defined as the ratio of the product concentrations raised to their stoichiometric coefficients, to the reactant concentrations raised to their stoichiometric coefficients, and is calculated using the same equation as Kc, but with the concentrations at a specific point in time, rather than at equilibrium.
Qc = [C]^c [D]^d / [A]^a [B]^b
It can be used to predict the direction of reaction depending on the sign of Qc, Kc.
If Qc < Kc, the reaction will shift in the direction of products.
If Qc > Kc, the reaction will shift in the direction of reactants
If Qc = Kc, the reaction is at equilibrium.
If you want to know more about equilibrium reaction you can check on Le Chatelier's principle.
Which is the correctly balanced chemical equation for the reaction of KOH and H2SO4?
A,B,C,or D?
Answer:
B
Explanation:
F app F fric F norm F grav Which statement best describes the forces shown in this picture? A. The force of friction and the gravitational force are balanced. B. The force of friction is less than the applied force. C. The normal force and the gravitational force are balanced. D. All four forces are acting on the student.
He is not falling nor about to fall which means he’s perfectly balanced. So this means the force in the photo and friction in this photo is in a balanced condition, balancing the boy.
How forces are balanced?In the given picture, the applied force and the force of friction are balanced. if two forces act in the direction to make the object in a balanced state.
If the forces are in a balanced state it does not change the motion of the object, and if it is in an unbalanced state, it causes to change in the state of the motion.
Therefore, the force of friction and the gravitational force are balanced is the correct option.
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The given question is incomplete, so the complete question image is attached in the image below.
In a typical IR spectrum, what name describes the units shown on the x-axis? a. wavenumber b. relative abundance c. %transmittance d. ppm e. intensity
In a typical IR spectrum, wavenumber name describes the units shown on the x-axis.
According to common understanding, IR includes wavelengths between the notional red edge of the visible spectrum, which is at a frequency of 430 THz, and 1 millimeter (300 GHz) (although the longer IR wavelengths are often designated rather as terahertz radiation ).The spatial frequency of a wave is measured in cycles per unit distance (common wavenumber) or radians per unit distance, and is also known as the wavenumber or repetency[1] (angular wavenumber).It is comparable to temporal frequency, which is determined by the quantity of radians or wave cycles per unit of time (ordinary frequency) (angular frequency).
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When heated, calcium carbonate forms calcium oxide and carbon
dioxide.
The equation for the reaction is:
CaCO3 + CaO + CO2
The relative atomic masses are Ar Ca = 40, C = 12,0 = 16
A student heated 25 g of calcium carbonate.
What mass of carbon dioxide was produced?
I
Mass of carbon dioxide =
(4 marks)
When calcium carbonate is heated, it breaks down into the components calcium oxide and carbon dioxide.
What do you mean by calcium carbonate?
Calcium carbonate is a chemical compound that has the formula CaCO3. It is a common mineral found in rocks as calcite and aragonite, and it is the main component of pearls and the shells of marine organisms, snails, and eggs. Calcium carbonate is a component of agricultural lime that is formed when calcium ions in hard water react with carbonate ions to form limescale. It's commonly used in medicine as a calcium supplement or an antacid, but too much of it can be dangerous.
25 g of calcium carbonate contains 25/100 x (40 + 12 + 3 x 16) = 25/100 x 88 = 22 g of calcium and 12 g of carbon.
Hence, mass of carbon dioxide produced is 12 g.
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A chemist determined by measurements that moles of silver participated in a chemical reaction. Calculate the mass of silver that participated in the chemical reaction.
A chemist determined that moles of silver participated in a chemical reaction using measurements. The mass of silver involved in the chemical reaction is 1.08 grams.
Moles of silver participated = 0.01
Molar mass of silver = 108 gram/mole
Weight of silver participated= mole* molar mass
= 0.01*108 gram
= 1.08 gram
A chemist (from the Greek chm(a) alchemy; replacing chymist from Medieval Latin alchemist) is a scientist who studies chemistry. Chemists investigate the structure and properties of matter. Chemists meticulously describe the properties of molecules and their constituent atoms in terms of quantities. Chemists carefully measure the proportions of substances, the rates of chemical reactions, and other chemical properties. Pharmacists are commonly referred to as chemists in Commonwealth English.
Chemists apply their knowledge to learn the composition and properties of new substances, as well as to reproduce and synthesize large quantities of useful naturally occurring substances and to create new artificial substances and processes.
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element q reacts with dilute acids but not with cold water . element r does not react with dilute acids . element s displaces p from its oxide . p reacts with cold water . arrange the four elements in order of their reactivity, starting with most reactive. please help, answer me the right answer
Answer:
s<p<q<r
Explanation:
Given
Element s displaces p from its oxide. Thus, s is more reactive that p
p reacts with cold water but element q cannot react with cold water. Thus,
p is more reactive than q
Element q is able to react with weak or dilute acids but element r in unable to react with weak or dilute acids. Thus, q is more reactive that r
The order of four elements on the basis of their reactivity in descending order is as follows
s<p<q<r
In regard to the E2 mechanism, rank the leaving groups in order of increasing reaction rate.
Slowest
Fastest
R-F R-I R-Cl R-Br
In the E2 mechanism, the rate of the reaction is affected by the strength of the bond between the leaving group and the carbon atom, as well as the stability of the resulting carbocation intermediate.
The order of the leaving groups in terms of increasing reaction rate would be:
Slowest: R-F
R-F is a relatively weak bond and the fluoride ion is a very poor leaving group, so the reaction rate would be slow.
R-Br
R-Cl
R-I
Fastest: R-I
R-I is a relatively strong bond and the iodide ion is a very good leaving group, so the reaction rate would be fastest.
R-Cl
R-Br
In short, the stability of the leaving group decreases as the atomic number of the atom increases, and the bond dissociation energy of the leaving group also decreases. So, it is Iodide>Chloride>Bromide>Fluoride.
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what is 10 times 10
Answer:
[tex]\huge{\textbf{\textsf{{\color{skyblue}{An}}{\blue{sw}}{\red{er}}{\color{red}{:}}}}}[/tex]
10 times 10
[tex]10 \times 10 \\ = 100[/tex]
100 is the correct answer.
Answer:
[tex]{\boxed{\boxed{\tt { ⎆ Answer :- }}}} \ [/tex]
⏩ [tex]10 \: \: times \: \: 10 \\ = 10 \times 10 \\ = 100[/tex]
ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
[tex] GuMiHo [/tex] ❦
Baed on the preure information in the data table, how are the preure of light and heavy particle related to the preure of the mixed particle?
Based on the pressure information in the data table, the pressure of light and heavy particle related to the pressure of the mixed particle having same pressure and same volume.
Why do heavy and light particles experience the same pressure?The lighter H₂ molecules will hit the walls more frequently and with less force because they move faster and collide with them more frequently. Because both light and heavy molecules hit the walls with roughly the same average kinetic energy at the same T, their pressure and consequent volume will be equal.
As the temperature increases, the particles gain energy and accelerate their motion. The movement of heavier particles is slower than that of lighter ones at the same temperature. Both the environment and the particles' mass affect their actual average speed.
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Complete question is" Based on the pressure information in the data table, how are the pressure of light and heavy particle related to the pressure of the mixed particle?".