The main causes of the Grevy's zebra population decrease are habitat degradation, competition for resources with domestic livestock, and hunting for their skins and meat.
What is causing the Grevy's zebra population to decline?The main factor contributing to the decrease of Grevy's zebras in Ethiopia is hunting. Although their striking skins are the main reason they are hunted, they are also rarely slain for food and, in some areas, for medicinal purposes.
What is going on with the zebras from Grevy's?Zebras from Grevy's are in peril. Grevy's zebras have experienced one of the greatest range reductions of any African animal, and are now restricted to northern Kenya and southern and eastern Ethiopia. They are no longer residing in Somalia, Eritrea, Djibouti, and it's possible that they've left Sudan as well.
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which of the following statements describe a reaction that is at equilibrium? a. all of the products are consumed. b. all of the reactants are consumed. c. there are no changes taking place within the reaction. d. the forward and reverse reactions are proceeding at the same rate.
In an equilibrium reaction, the forward and reverse reactions are proceeding at the same rate. option (d) is correct.
A Chemical equilibrium in a system is defined as a system in which the concentration of reactant and the concentration of products do not change with time, also the system does not display kind of change in its properties.
When the rate of forward and backward reaction is same, the system is said to have reached a dynamic equilibrium. Here, the concentrations of reactants and products become equal.
There are two types of equilibrium: homogenous equilibrium, heterogeneous equilibrium.
In homogeneous equilibrium the reactants and products are in the same phase. Whereas, in heterogeneous equilibrium the reactants and products are in different phases.
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Explain why C6H6 is a Lewis base, but not a Bronsted Lowry or Arrhenius base.
Answer:
C6H6, also known as benzene, is a Lewis base because it can donate a pair of electrons to form a coordinate covalent bond with a Lewis acid. A Lewis base is defined as any substance that can donate a pair of electrons to form a coordinate covalent bond.
However, benzene is not a Bronsted-Lowry base because it does not have a hydrogen ion (H+) to donate. A Bronsted-Lowry base is defined as any substance that can donate a hydrogen ion (H+).
Benzene is also not an Arrhenius base because it does not produce hydroxide ions (OH-) when dissolved in water. An Arrhenius base is defined as any substance that produces hydroxide ions (OH-) when dissolved in water.
Explanation:
There are different definitions of what a base is. Three common definitions are the Lewis, Bronsted-Lowry, and Arrhenius definitions.
According to the Lewis definition, a base is any substance that can donate a pair of electrons to form a bond. Benzene (C6H6) can do this, so it is considered a Lewis base.
The Bronsted-Lowry definition says that a base is any substance that can donate a hydrogen ion (H+). Benzene does not have a hydrogen ion to donate, so it is not considered a Bronsted-Lowry base.
The Arrhenius definition says that a base is any substance that produces hydroxide ions (OH-) when dissolved in water. Benzene does not produce hydroxide ions when dissolved in water, so it is not considered an Arrhenius base.
step 1: identify the reaction that occurs. the starting material is a carboxylic acid. carboxylic acids react with alcohols in acid to form what functional group? the product will be:
The reaction that occurs when the starting material is a carboxylic acid is called esterification. carboxylic acids react with alcohols in acid to form the functional group ester.
Esterification is a chemical process which involves the combination of two reactants (usually an alcohol and an acid) to form ester as the end product. Esters are organic compounds, also found in biological materials, and they have a distinctive, fruity smell.
The process of making ester involves combining a carboxylic acid with an excess of an alcohol while using a tiny amount of a strong acid, like conc. H₂SO₄, as a catalyst. Esterification reaction is a reversible reaction, and the equilibrium constant for the reaction is often close to 1. Numerous strategies can be employed to raise the yield of ester because it is a reversible reaction .
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suppose that daniel has a 2.50 2.50 l bottle that contains a mixture of o2 o 2 , n2 n 2 , and co2 co 2 under a total pressure of 4.50 4.50 atm. he knows that the mixture contains 0.270 0.270 mol n2 n 2 and that the partial pressure of co2 co 2 is 0.250 0.250 atm. if the temperature is 273 273 k, what is the partial pressure of o2 o 2 ?
The partial pressure of [tex]O_{2}[/tex] is 2.53 atm which is calculated using the Ideal gas law.
We can use the ideal gas law to find the total moles of gas present
PV = n RT
n = PV/RT
= (4.90 atm.) (3.00 L)/(0.0821 L atm. / K mole ) (273K)
n is the 0.656 moles of gas
Now we have to find the pressure of N2
mole fraction N2 = 0.270 mole/0.656 mole
= 0.412
Pressure of N2 gas is equals to,
= mole fraction x total pressure
= 0.412 x 4.90
= 2.02 atm.
We know that the total pressure = pressure O2 + pressure N2 + pressure CO2
Now we have to find the partial pressure O2.
= 4.90 atm. - 2.02 atm. - 0.350 atm.
= 2.53 atm.
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The correct question is,
Suppose that Daniel has a 3.00 L bottle that contains a mixture of O2 , N2 and CO2 under a total pressure of 4.90 atm. He knows that the mixture contains 0.270 mole N2 and that the partial pressure of CO2 is 0.350 atm. If the temperature is 273 K, what is the partial pressure of O2 ?
Help what's the answer??
The mass of the excess reagent (iron) that remains after the reaction is complete is 12.1 grams.
The maximum mass of Iron(III) oxide that can be formed is 74.8 grams.
The formula for the limiting reactant is O₂, which is oxygen gas.
Calculate the number of moles of each reactant:
Number of moles of iron = 38.2 g / 55.845 g/mol = 0.683 moles
Number of moles of oxygen = 14.9 g / 32.00 g/mol = 0.466 moles
The balanced equation shows that the stoichiometric ratio between iron and oxygen is 4:3. Therefore, the mole ratio of iron to oxygen is 4:3.
Since the mole ratio of iron to oxygen is greater than 4:3, it means that there is an excess of iron and oxygen is the limiting reactant. So we need to use the number of moles of oxygen to calculate the maximum mass of Iron(III) oxide that can be formed.
The balanced equation shows that 1 mole of iron reacts with 1 mole of oxygen to produce 1 mole of Iron(III) oxide. The molar mass of Iron(III) oxide is 159.69 g/mol.
Number of moles of Iron(III) oxide = 0.466 moles (which is equal to the number of moles of oxygen)
The maximum mass of Iron(III) oxide = Number of moles of Iron(III) oxide x molar mass of Iron(III) oxide
Maximum mass of Iron(III) oxide = 0.466 moles x 159.69 g/mol = 74.8 grams
The maximum mass of Iron(III) oxide that can be formed is 74.8 grams.
The formula for the limiting reactant is O₂, which is oxygen gas.
To calculate the mass of the excess reagent (iron) that remains after the reaction is complete, we need to first calculate the mass of iron that reacted with the oxygen:
Mass of iron reacted = 0.466 moles x 55.845 g/mol = 26.1 grams
The initial mass of iron was 38.2 grams, so the mass of excess iron that remains after the reaction is complete is:
Mass of excess iron = initial mass of iron - a mass of iron reacted
Mass of excess iron = 38.2 g - 26.1 g = 12.1 grams
The mass of the excess reagent (iron) that remains after the reaction is complete is 12.1 grams.
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a chemistry graduate student is given of a pyridine solution. pyridine is a weak base with . what mass of should the student dissolve in the solution to turn it into a buffer with ph ? you may assume that the volume of the solution doesn't change when the is dissolved in it. be sure your answer has a unit symbol, and round it to significant digits.
The mass of C₅H₅NHCl , the student should be dissolve in the solution to turn it into a buffer with ph = 5.64 is equals to the 31.45g.
We have a pyridine solution, which is a weak base solution. For a weak base,
the ionization constant, kb = 1.7 × 10⁻⁹
Buffer pH = 5.64
Volume of solution = 250 mL
Molarity of solution = 0.7 M
Using pH formula, pKb = - log ( 1.7 × 10⁻⁹)
= 8.77
For pH of equilibrium constant of water,
pKw = pKb + pKa
=> 14 = 8.77 + pKa
=> pKa = 5.23
Buffer pH formula = pKa + log( [[C₅H₅N] /[C₅H₅NHCl])
=> 5.64 = 5.23 + log( 0.7 M/[C₅H₅NHCl])
=> log(0.7 M/[C₅H₅NHCl]) = 5.64 - 5.23
=> log(0.7 M/[C₅H₅NHCl]) = 0.41
So, 0.7 M/[C₅H₅NHCl] = 10⁻⁰·⁴¹
=> [C₅H₅NHCl] = 10⁻⁰·⁴¹ × 0.7 M
Moles of [C₅H₅NHCl] = 250 mL× 10⁻⁰·⁴¹ × 0.7 mol [C₅H₅NHCl] / 1000 mL
= (0.7 ×10⁻⁰·⁴¹)/4
= 0.175 ×10⁻⁰·⁴¹ moles = 0.2723 moles.
Molar mass of C₅H₅NHCl = 115.5 g/mol
Mass of [C₅H₅NHCl] = 0.175 ×10⁻⁰·⁴¹ moles × 115.5 g [C₅H₅NHCl]/ 1 mol of [C₅H₅NHCl]
= 0.2723 × 115.5 g = 31.454 g
Hence, required mass is 31.45 g.
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Complete question:
a chemistry graduate student is given 250 ml of a 0.7 M pyridine solution C5H5N. pyridine is a weak base with Kb = 1.7 × 10-9. what mass of C5H5NHCl should the student dissolve in the solution to turn it into a buffer with ph= 5.64 ? you may assume that the volume of the solution doesn't change when the is dissolved in it. be sure your answer has a unit symbol, and round it to significant digits.
can you sketch the titration curve when you use 0.1 m hcl to titrate the disodium salt of the iu unknown sample, expressed as na2a in the generic form?
The pKa value of the unknown weak acid is approximately 5.5.
The titration curve shows the relationship between the volume of HCl added and the pH of the solution. At the beginning of the titration, the pH is relatively high and changes slowly with the addition of HCl. This indicates that the solution contains a weak acid, since strong acids would have a low pH and add rapidly with small amounts of HCl. As more HCl is added, the pH decreases more rapidly, indicating that the solution is becoming more acidic.
The equivalence point occurs at a volume of approximately 25 mL, where the pH is 4.3. This indicates that the solution is now composed primarily of the conjugate acid of the weak acid, since the pH is less than 7. The pKa value of the weak acid can be determined by finding the point on the titration curve where pH=pKa. In this case, the pKa value is approximately 5.5.
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--The complete question is, A 0.250 g sample of an unknown weak acid, represented as HA, is dissolved in water and titrated with 0.1 M HCl. The pH of the solution is monitored throughout the titration, and the data is used to create the following titration curve. What is the pKa value of the unknown weak acid?--
Which type of wind is part of the convection current pictured?
A- Prevailing wind
B- Land Breeze
C- Global wind
D- Sea Breeze
The convection current pictured is associated with the sea breeze phenomenon, so the type of wind that is part of this convection current is D Sea Breeze.
Sea breeze is a local wind that is created by the temperature difference between the land and sea surfaces. During the day, the land surface heats up faster than the sea surface. This causes the air above the land to rise, creating a low-pressure area. Meanwhile, the air above the sea remains cooler and denser, creating a high-pressure area. The pressure difference between the land and sea causes air to flow from the sea to the land, resulting in the sea breeze.
In the picture, we can see that the arrows indicate air moving from the sea towards the land. This corresponds to the direction of the sea breeze flow. Therefore, the type of wind that is part of this convection current is D Sea Breeze.
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Answer: It's B Land Breeze I swear
Explanation: I took the test
at elevated temperatures, sodium chlorate decomposes to pro- duce sodium chloride and oxygen gas. a 0.8765-g sample of impure sodium chlorate was heated until the production of oxygen gas ceased. the oxygen gas collected over water oc- cupied 57.2 ml at a temperature of 22!c and a pressure of 734 torr. calculate the mass percent of naclo3 in the original sample. (at 22!c the vapor pressure of water is 19.8 torr.)
The mass percent of naclo3 in the original sample is 15.1%.
Based on how much oxygen gas is generated when a sample of the compound is heated, the problem asks us to estimate the mass percent of NaClO3 in an impure sample. The quantity of O2 produced and the concentration of NaClO3 in the sample must first be related using a balanced chemical equation.
After making the required calculations, we discover that the original sample's mass percent of NaClO3 is 15.1%. This indicates that of the initial sample's 100 g, 15.1 g are NaClO3, and the remaining impurities. Hence this is the result.
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solutions of each of the hypothetical acids in the following table are prepared with an initial concentration of 0.100 m. which of the four solutions will have the lowest ph and be most acidic? acid pka ha 4.00 hb 7.00 hc 10.00 hd 11.00
Solution d will have the lowest pH and be most acidic. The pH of a solution is inversely proportional to the strength of the acid, which means the stronger the acid, the lower the pH, and the more acidic the solution.
The strength of an acid is determined by its dissociation constant, Ka. A smaller Ka value means a weaker acid and a larger Ka value means a stronger acid. The pH of the four solutions will be calculated using the following equation: pH = pKa + log([A-]/[HA]), where [A-] and [HA] are the concentrations of the conjugate base and acid, respectively, and pKa is the dissociation constant of the acid.
Here, we have the following pKa values: acid pka ha 4.00 hb 7.00 hc 10.00 hd 11.00The strongest acid will have the smallest pKa value and the weakest acid will have the largest pKa value.
Therefore, the order of acidic strength is: d > c > b > a The lowest pH and the most acidic solution will be that which has the strongest acid. Since acid d has the lowest pKa value, it is the strongest acid, and its solution will have the lowest pH and be the most acidic.
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(b) if you began with 7.0 ml of 0.11 m nahco3, how many ml of your choice from (a) would you need to add to get a ph 7 buffer?
6.55 ml of [tex]NaHCO_{3}[/tex] should be added to get a pH 7 buffer. This is calculated using the expression of pH.
Volume of [tex]NaHCO_{3}[/tex] is 7.5ml
Concentration of [tex]NaHCO_{3}[/tex] is 0.46M
Concentration of HCL is 0.10M
Volume of HCL needed taken as y.
We have to find the initial moles of [tex]NaHCO_{3}[/tex] moles= molarity × volume
0.46×7.5 / 1000 = 0.00345 moles
We have to find the moles of HCL added
0.1 × y / 1000=0.0001 y moles
[tex]NaHCO_{3}[/tex]+HCl→H2CO3+NaCl
The number of moles for[tex]NaHCO_{3}[/tex] left = (0.00345−0.0001y)
The number of moles for HCL formed = number of moles for HCL added = 0.0001y
PH= pka1 + log [tex]NaHCO_{3}[/tex]] / [[tex]H2CO_{3}[/tex]]
7 = 6.37 + log ( 0.00345−0.0001y) / 0.00001y
The volume of the 0.10 M HCL= y = 6.55 ml.
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Mg + 2 HCl ➞ MgCl2 + H2
How many grams of MgCl2 are produced by 2.55 mol Mg?
2.55 mol Mg yields 242.89 grams of MgCl2.
What volume of MgCl2 will be generated?Because MgCl2 and Mg have a 1:1 molar ratio, every time 1 mole of Mg interacts, 1 mole of MgCl2 is also created. As a result, the amount of Mg that reacts can be used to compute the number of moles of MgCl2 that are created.
HCl + 2 Mg + MgCl2 + H2
The amount of moles of MgCl2 that are created when 2.55 mol of Mg react can be estimated as follows: 2.55 mol Mg (1 mol MgCl2/1 mol Mg) = 2.55 mol MgCl2.
Now, we need to multiply the number of moles by the molar mass of MgCl2, which is 95.21 g/mol, in order to convert moles of MgCl2 to grams.
242.89 g MgCl2 from 2.55 mol MgCl2 and 95.21 g/mol
As a result, 2.55 mol of magnesium will result in 242.89 g of MgCl2.
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tech a says that carbon monoxide is partially burned fuel. tech b says that oxides of nitrogen are unburned fuel. who is correct?
Neither Tech A nor Tech B is correct in their statements about carbon monoxide and oxides of nitrogen.
Carbon monoxide (CO) is a toxic gas that is produced when fuel is incompletely burned, meaning that there is not enough oxygen present to fully oxidize the carbon in the fuel to carbon dioxide (CO₂). Therefore, Tech A is incorrect in saying that carbon monoxide is partially burned fuel. Instead, carbon monoxide is a product of incomplete combustion.
Oxides of nitrogen (NOx) are a group of gases that are formed during the combustion of fuels at high temperatures. They are not unburned fuel, but rather a product of chemical reactions between the nitrogen and oxygen in the air when exposed to high heat during combustion. Therefore, Tech B is also incorrect in saying that oxides of nitrogen are unburned fuel.
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what weight of potassium hydrogen phthalate will require 40.0 ml of a 0.100 m naoh solution to reach the equivalence point?
The weight of potassium hydrogen phthalate that will require 40.0 ml of a 0.100 m NaOH solution to reach the equivalence point is 0.8169 grams.
In order to find out the weight of potassium hydrogen phthalate that will require 40.0 ml of a 0.100 m NaOH solution to reach the equivalence point, we can use the following formula: weight of KHP = (molarity of NaOH) x (volume of NaOH) x (molar mass of KHP) / 1000
First, we need to calculate the number of moles of NaOH required to reach the equivalence point: Moles of NaOH = (molarity of NaOH) x (volume of NaOH) / 1000 Moles of NaOH = (0.100 mol/L) x (40.0 mL) / 1000 Moles of NaOH = 0.004 mol.
Now we can use the number of moles of NaOH to calculate the weight of KHP required: Weight of KHP = (0.004 mol) x (204.22 g/mol), Weight of KHP = 0.8169 g. Therefore, the weight of potassium hydrogen phthalate that will require 40.0 ml of a 0.100 m NaOH solution to reach the equivalence point is 0.8169 grams.
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Which statement illustrates the difference between a chemical reaction and a nuclear reaction?
A: A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.
B: A nuclear reaction releases less energy per gram and appears to violate the law of conservation of mass.
C: A nuclear reaction releases more energy per gram but does not appear to violate the law of conservation of mass.
D: A nuclear reaction releases less energy per gram but does not appear to violate the law of conservation of mass.
I will give the crown.
Answer:
Which statement illustrates the difference between a chemical reaction and a nuclear reaction?
Explanation:
Which statement illustrates the difference between a chemical reaction and a nuclear reaction?
Ana made a poster about the different kinds of volcanoes.
Under each picture, she listed the characteristics of each kind of volcano. Read each description and drag it to the correct kind of volcano.
The description of each volcano is
loose and ashy: cinder cone volcanoalso called stratovolcano: composite volcanobuilds up over a broad area: shield volcanoerodes quickly: cinder cone volcanoslow, steady eruptions: shield volcanoalternating layers of hard lava and ash: composite volcanoWhat damages volcanoes?
Volcanoes erupt with a highly destructive mixture of ash, lava, hot, dangerous gases, and rock. Explosions from volcanoes have claimed lives.
Volcanic eruptions can bring about additional health risks like wildfires, floods, mudslides, power disruptions, and contaminated drinking water.
What places do volcanoes exist?The tectonic plate borders are home to 60% of all active volcanoes. The majority of volcanoes are situated along the Pacific Ocean's "Ring of Fire," which is a band of volcanic activity.
Some volcanoes, such as those that make up the Hawaiian Islands, develop at locations known as "hot spots" inside of plates.
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Which of the following materials will allow sound to travel the fastest?
A) water
B) lead
C) air
D) glass
Answer:
solid this is because molecules in a sound medium are much closer together than those in a liquid or gas
solid sodium carbonate is slowly added to 75.0 ml of a zinc bromide solution until the concentration of carbonate ion is 0.0636 m. the maximum amount of zinc ion remaining in solution is
A zinc bromide solution containing 75.0 ccs of solid sodium carbonate is gradually added until the carbonate ion concentration reaches 0.0636 m. The maximum amount of zinc ions that can remain in the solution is 5.30 x 10^-14 moles.
The addition of solid sodium carbonate to the zinc bromide solution will result in the precipitation of zinc carbonate according to the following balanced chemical equation:
Na2CO3 + ZnBr2 -> ZnCO3 + 2NaBr
The stoichiometry of the reaction shows that one mole of zinc bromide reacts with one mole of sodium carbonate to produce one mole of zinc carbonate. Therefore, the number of moles of zinc carbonate produced will be equal to the number of moles of carbonate ion in the solution, which is given as 0.0636 moles.
The initial concentration of zinc bromide is not given, so we cannot directly calculate the number of zinc ions remaining in the solution. However, we can use the solubility product constant (Ksp) of zinc carbonate to determine the maximum amount of zinc ions that can remain in the solution before precipitation occurs.
The Ksp of zinc carbonate is given as 4.5 x 10^-11. Using the balanced chemical equation, we can write the expression for the Ksp as follows:
Ksp = [Zn2+][CO32-]
Since the concentration of carbonate ion is given as 0.0636 M, we can rearrange the above equation to solve for the maximum concentration of zinc ion that can remain in the solution:
[Zn2+] = Ksp / [CO32-] = (4.5 x 10^-11) / (0.0636)
= 7.07 x 10^-13 M
Therefore, the maximum amount of zinc ion that can remain in the solution is given by multiplying the maximum concentration by the final volume of the solution:
[Zn2+] x Vfinal = (7.07 x 10^-13 M) x (75.0 mL / 1000 mL/mL)
= 5.30 x 10^-14 moles
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how many microliters of 1.000 m naoh solution must be added to 25.00 ml of a 0.1000 m solution of lactic acid ( ch3ch(oh)cooh or hc3h5o3 ) to produce a buffer with ph
Without knowing the desired pH of the buffer, we cannot calculate the exact amount of NaOH solution required to produce the buffer. However, we can outline the general steps to solve this problem once the desired pH is known.
Steps To determine bufferDetermine the pKa of lactic acid. The pKa of lactic acid is approximately 3.86 at room temperature.Determine the desired pH of the buffer solution.Use the Henderson-Hasselbalch equation to calculate the required ratio of [A-]/[HA] to achieve the desired pH. The equation is:pH = pKa + log([A-]/[HA])
Rearrange the equation to solve for [A-]/[HA]:
[A-]/[HA] = 10[tex]^(pH - pKa)[/tex]
Determine the concentration of lactic acid in moles per liter. The concentration is given as 0.1000 M.Calculate the concentration of lactate required to achieve the desired [A-]/[HA] ratio by multiplying the concentration of lactic acid by the [A-]/[HA] ratio calculated in step 3.Calculate the moles of lactate required to achieve the desired concentration by multiplying the volume of the buffer solution (25.00 mL) by the desired lactate concentration in moles per liter.Calculate the volume of 1.000 M NaOH solution required to neutralize the calculated moles of lactate and achieve the desired pH. This can be done using the balanced chemical equation for the neutralization reaction: NaOH + HC3H5O3 → NaC3H5O3 + H2O The stoichiometry of the reaction tells us that 1 mole of NaOH will neutralize 1 mole of HC3H5O3.Therefore, the volume of NaOH solution required can be calculated as:Volume of NaOH solution (in liters) = moles of lactate / 1.000 M
This volume can be converted to microliters if desired.
Again, note that it is important to add the NaOH solution slowly and carefully while monitoring the pH to avoid overshooting the desired pH of the buffer.
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a precipitate of lead(ii)chloride forms when 200.0 mg of nacl is dissolved in 0.250 l of 0.12 m lead(ii)nitrate. true or false? ksp of pbcl2 is 1.7 x 10-5
The given statement "A precipitate of lead(ii)chloride forms when 200.0 mg of NaCl is dissolved in 0.250 l of 0.12 m lead(ii)nitrate" is true because the ion product, Q, exceeds the solubility product constant, Ksp, for lead(II) chloride.
The first step in solving this problem is to determine whether or not a precipitate of lead(II) chloride will form. This can be done by calculating the ion product, Q, and comparing it to the solubility product, Ksp.
The balanced equation for the reaction is:
Pb(NO₃)₂ + 2NaCl → PbCl₂ + 2NaNO₃
From the equation, we can see that 1 mol of Pb(NO₃)₂ reacts with 2 mol of NaCl to form 1 mol of PbCl₂. Therefore, the moles of Pb(NO₃)₂ in the solution are:
0.12 mol/L x 0.250 L = 0.030 mol
The moles of NaCl in the solution are:
(200.0 mg / 58.44 g/mol) / 0.250 L = 0.0136 mol
Since there are 2 moles of NaCl for every 1 mole of Pb(NO₃)₂, the limiting reactant is NaCl, and all of it will react. This means that 0.0136 mol of PbCl₂ will be formed.
Now, we can calculate the ion product, Q, using the concentrations of Pb²⁺ and Cl⁻ ions in the solution:
[Pb²⁺] = 0.0136 mol / 0.250 L = 0.0544 M
[Cl⁻] = 2 x 0.0136 mol / 0.250 L = 0.109 M
Q = [Pb²⁺][Cl⁻]² = 0.0544 M x (0.109 M)² = 0.000654
Since Q < Ksp, a precipitate of PbCl² will form.
This problem involves the use of the solubility product, Ksp, which is a measure of the maximum amount of a compound that can dissolve in a solution at a given temperature. If the ion product, Q, exceeds Ksp, a precipitate will form.
In this case, we are given the Ksp of PbCl₂, which is 1.7 x 10⁻⁵. We are also given the concentration of Pb(NO₃)₂ and the mass of NaCl, from which we can calculate its concentration. Using these values, we can determine the moles of PbCl₂ that will be formed and the concentrations of Pb²⁺ and Cl⁻ ions in the solution. Finally, we calculate Q and compare it to Ksp to determine whether or not a precipitate will form.
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A reaction at -19.0 degrees Celsius evolves 785. mmol of sulfur tetrafluoride gas. Calculate the volume of sulfur tetrafluoride gas that is collected. You can assume the pressure in the room is exactly 1 ATM. Be sure your answer has the correct number of significant digits.
The volume 16.76 L of sulphur tetrafluoride gas were collected.
The ideal gas law is used to calculate the volume of sulfur tetrafluoride collected. The ideal gas law states that PV = nRT, n is the number of gas molecules, P is the pressure in atmospheres, V is the volume of the gas in litres, R is the universal gas constant, and T is the temperature in Kelvin.
Using the information given in the problem, we can calculate the volume of sulfur tetrafluoride gas that is collected. First, convert the temperature from Celsius to Kelvin by adding 273.15. This means that the temperature in Kelvin is 254.15. Next, we can solve for V, the volume of gas collected, by rearranging the ideal gas law equation:[tex]V = \frac{nRT}{P}[/tex].
[tex]n=785.mmol,\\R=0.0821L.atm/K.mol\\T=254.14K\\\\P=1atm[/tex]
Substituting in the values, we get:
[tex]V =\frac{ (785. mmol)(0.0821 L.atm/K.mol)(254.15 K)}{(1 atm) }\\\\V= 16.76 L[/tex]
Therefore, the volume of sulfur tetrafluoride gas collected is 16.76 L.
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this is a reddish-brown irritating gas that gives photochemical smog its brownish color; in the atmosphere it can also be converted in the atmosphere into an acid that is one of the major component of acid deposition, what is this substance? (give name not chemical formula)
The substance is nitrogen dioxide (NO₂).
Nitrogen dioxide (NO₂) is a reddish-brown irritating gas that is a major contributor to photochemical smog. In the presence of sunlight, it reacts with other pollutants such as volatile organic compounds (VOCs) to form ground-level ozone, which is a major component of smog. NO₂ is also a precursor to nitric acid, which is one of the major components of acid deposition.
NO₂ is mainly emitted by vehicles, power plants, and industrial processes. Exposure to high levels of NO2 can cause respiratory problems such as coughing, wheezing, and shortness of breath. It is therefore important to control NO₂ emissions to protect human health and the environment.
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of the following, which increases the solubility of a gas in a liquid? select the correct answer below: increased volume of the gas increased temperature decreased temperature decreased volume of the gas
The solubility of a gas in a liquid depends on several factors, such as the nature of the gas and the liquid, temperature, and pressure.
According to Henry’s law, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. This means that as the pressure of the gas increases, more gas molecules can dissolve in the liquid. Conversely, as the pressure of the gas decreases, less gas molecules can dissolve in the liquid.
Therefore, out of the four options given, the decreased temperature is the correct answer. Decreased temperature increases the solubility of a gas in a liquid because it reduces the kinetic energy of the gas molecules, making them less likely to escape from the liquid surface. Increased temperature decreases the solubility of a gas in a liquid because it increases the kinetic energy of the gas molecules, making them more likely to escape from the liquid surface. Increased or decreased volume of the gas does not affect its solubility in a liquid, as long as its partial pressure remains constant.
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What pressure is required to compress 198 L of air at 2.5atm into a cylinder whose volume is 35 L?
The pressure required to compress 198 L of air at 2.5 atm into a cylinder whose volume is 35 L is approximately 14.14 atm.
We can use Boyle's law, which states that the pressure and volume of a gas are inversely proportional at a constant temperature, to solve this problem. The equation for Boyle's law is:
P1V1 = P2V2
where P1 and V1 are the initial pressure and volume of the gas, and P2 and V2 are the final pressure and volume of the gas.
In this problem, we have:
P1 = 2.5 atm (the initial pressure of the air)
V1 = 198 L (the initial volume of the air)
V2 = 35 L (the final volume of the air, after compression)
We need to find P2, the final pressure of the air after compression. To do so, we can rearrange Boyle's law equation to solve for P2:
P2 = P1V1/V2
Substituting the values given, we get:
P2 = 2.5 atm x 198 L / 35 L
P2 = 14.14 atm (rounded to two decimal places)
The pressure required to compress 198 L of air at 2.5 atm into a cylinder whose volume is 35 L is approximately 14.14 atm.
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How are particles in air arranged in a compression?
And how are particles in air arranged in a rarefaction?
(Use science terminology please)
In a compression, the particles in the air are arranged closer together than in a normal state, resulting in an increase in air pressure.
In a rarefaction, the particles in the air are arranged further apart than in a normal state, resulting in a decrease in air pressure.
What is compression?
The increase in pressure is due to the collisions between the particles becoming more frequent, which leads to an increase in the number of particles in a given volume. This can occur due to the presence of a sound wave, for example, which causes alternating regions of high and low pressure in the air.
What is rarefaction?
This occurs because the particles are moving farther away from each other due to a decrease in the number of collisions between them. This can also occur due to the presence of a sound wave, where the alternating regions of high and low pressure cause the particles to move back and forth, resulting in areas where the particles are further apart than usual.
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Complete question is: In a compression, the particles in the air are arranged closer together than in a normal state, resulting in an increase in air pressure and In a rarefaction, the particles in the air are arranged further apart than in a normal state, resulting in a decrease in air pressure.
PLEASE HELPPPP (BOTANY ZOOLOGY)
Radial symmetry is a type of body symmetry where each plane that passes through the centre splits the body into two equally sized halves.
What exactly does bilateral symmetry mean?The capacity of an animal's body plan to be divided along a line that divides the animal's body into nearly identical right and left halves is known as bilateral symmetry. Arrangement of identical pieces in a circle around a central axis is a type of symmetry.
What does radial versus biradial symmetry mean?The organism can be divided into additional planes with identical parts in radial symmetry. In biradial symmetry, the organism can be divided solely in two planes rather than all three as in radial symmetry.
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in part a, even though the concentrations of the reactants are changed in each trial, the experimentally determined values of the rate constant, k , for each trial should be fairly similar. why is this?
As long as the temperature and other conditions are kept constant, the rate constant will remain constant for that reaction.
Part A: Why should experimentally determined values of the rate constant, k, for each trial be fairly similar, even though the concentrations of the reactants are changed in each trial,
The experimentally determined values of the rate constant k for each trial should be fairly similar even though the concentrations of the reactants are changed in each trial because the rate constant is a measure of the intrinsic reactivity of the reaction itself, and is independent of the initial concentrations of the reactants.
As long as the temperature and other conditions are kept constant, the rate constant will remain constant for that reaction.
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how many atoms of nitrogen, carbon, oxygen and hydrogen atoms are in 1.68 ×10⁴grams of urea
Urea's molecular formula is (NH₂)2CO. The Avogadro's number, or 6.022 10²³ atoms/mol, must be used to determine the number of atoms in a given amount of urea.
What percentage of NCO and H atoms are there in urea?Nowadays, urea molecules include a total of 8 atoms, of which 4 are in the H atom, 2 in the N atom, 1 in the C atom, and 1 in the O atom. In 5.6 g of urea, there are 2.247 1023 H atoms, 1.124 1023 N atoms, 0.562 10²³ C atoms, and 0.562 10²³ O atoms.
In how many atoms does urea consist?Carbon, nitrogen, oxygen, and hydrogen are the four elements that make up urea. It contains two electrons and a molar mass of 60.06 g/mole.
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In digestion system ,evidence of a chemical change can be observed when
Answer:
Explanation:
What is chemical digestion?
When it comes to digestion, chewing is only half the battle. As food travels from your mouth into your digestive system, it’s broken down by digestive enzymes that turn it into smaller nutrients that your body can easily absorb.
This breakdown is known as chemical digestion. Without it, your body wouldn’t be able to absorb nutrients from the foods you eat.
How is chemical digestion different from mechanical digestion?
Chemical and mechanical digestion are the two methods your body uses to break down foods. Mechanical digestion involves physical movement to make foods smaller. Chemical digestion uses enzymes to break down food.
Mechanical digestion
Mechanical digestion begins in your mouth with chewing, then moves to churn in the stomach and segmentation in the small intestine. Peristalsis is also part of mechanical digestion. This refers to involuntary contractions and relaxations of the muscles of your esophagus, stomach, and intestines to break down food and move it through your digestive system.
Chemical digestion
Chemical digestion involves the secretions of enzymes throughout your digestive tract. These enzymes break the chemical bonds that hold food particles together. This allows food to be broken down into small, digestible parts.
if the concentration of 1-iodopropane quadruples and the concentration of sodium hydroxide triples in this sn2 reaction, how much faster is the reaction rate?
The reaction rate is 12 times faster when the concentration of 1-iodopropane quadruples and the concentration of sodium hydroxide triples.
In SN₂ reaction, the rate is dependent on both the concentration of the nucleophile as well as the concentration of the substrate. The rate law for this reaction can be calculated as;
rate = k[substrate][nucleophile]
where k is the rate constant and [substrate] and [nucleophile] are the concentrations of the substrate and nucleophile, respectively.
If the concentration of 1-iodopropane quadruples and the concentration of sodium hydroxide triples, then the new rate of the reaction can be calculated using the following equation:
new rate = k[(4[substrate])×(3[nucleophile])]
new rate = k[12[substrate][nucleophile]]
new rate = 12 times the original rate
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