Chemistry, 02.02.2020 10:44 danielle2814

Question 1 (matching worth 3 points)
(07.07 mc)

match the action to the effect on the equilibrium position for the reaction n2(g) + 3h2(g) ⇌ 2nh3(g).

match term definition
removing ammonia a) no effect
removing hydrogen gas b) shift to the left
adding a catalyst c) shift to the right
question 2(multiple choice worth 3 points)
(07.07 mc)

nitrogen dioxide gas is dark brown in color and remains in equilibrium with dinitrogen tetroxide gas, which is colorless.

2no2(g) ⇌ n2o4(g)

when the light brown color equilibrium mixture was moved from room temperature to a lower temperature, the mixture turned lighter brown in color. which of the following conclusions about this equilibrium mixture is true?

this reaction is endothermic because the system shifted to the left on cooling.
this reaction is endothermic because the system shifted to the right on cooling.
this reaction is exothermic because the system shifted to the left on cooling.
this reaction is exothermic because the system shifted to the right on cooling.
question 3(multiple choice worth 3 points)
(07.07 lc)

according to le châtelier's principle, how will a decrease in concentration of a reactant affect the equilibrium system?

shift it toward the products
shift it toward the reactants
shift it toward the side with higher total mole concentration
shift it toward the side with lower total mole concentration
question 4(multiple choice worth 3 points)
(07.07 mc)

what change would shift the equilibrium system to the left?

a(g) + b(s) + energy ⇌ 3c(g)

adding more of gas c to the system
heating the system
increasing the volume
removing some of gas c from the system
question 5(multiple choice worth 3 points)
(07.07 mc)

a chemical equilibrium between gaseous reactants and products is shown.

n2(g) + 3h2(g) ⇌ 2nh3(g)

how will the reaction be affected if the pressure on the system is decreased?

it will shift toward the reactant side because the reactant side has one more mole of gas than the product side.
it will shift toward the product side as there are more oxygen atoms in the gas on the product side.
it will shift toward the reactant side as there is lower pressure on the reactant side.
it will shift toward the product side as there is higher pressure on the product side.
question 6 (true/false worth 2 points)
(07.07 lc)

according to le châtelier's principle, an increase in temperature will shift the equilibrium position toward the products in an endothermic reaction.

true
false
question 7(multiple choice worth 3 points)
(07.07 mc)

what stress would shift the equilibrium position of the following system to the right?

n2o3(g) ⇌ no(g) + no2(g); δh is negative

decreasing the concentration of n2o3
heating the system
adding a catalyst
increasing the concentration of no

Answers: 2

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Answers

Answer from: 25linm

Question 1: 1) Increasing the pressure C) Shift to the right

2) Removing hydrogen gas A) Shift to the left

3) Adding a catalyst B) No effect

Question 2: This reaction is exothermic because the system shifted to the right on cooling.

Question 3: Shift it toward the reactants.

Question 4: Adding more of gas C to the system.

Question 5: It will shift toward the reactant side because the reactant side has one more mole of gas than the product side.

Question 6: True.

Question 7: there is no suitable choice is provided.

We can shift the equilibrium toward the right via:

Increasing N2O3 concentration,

decreasing NO and/or NO2 concentration,

decreasing the pressure,

lowering the T (cooling the system).

Explanation:

Question 1: Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g).

MatchTermDefinition

Removing ammoniaA) No effect

Removing hydrogen gasB) Shift to the left

Adding a catalystC) Shift to the right

Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.

1) Increasing the pressure:

When there is an increase in pressure, the equilibrium will shift towards the side with fewer moles of gas of the reaction. And when there is a decrease in pressure, the equilibrium will shift towards the side with more moles of gas of the reaction.The reactants side (left) has 4.0 moles of gases and the products side (right) has 2.0 moles of gases.So, increasing the pressure will shift the reaction to the side with lower moles of gas (right side).

so, the right match is: C) Shift to the right.

2) Removing hydrogen gas:

Removing hydrogen gas will decrease the concentration of the products side, so the reaction will be shifted to the lift side to suppress the decrease in the concentration of hydrogen gas by removing.

so, the right match is: A) Shift to the left.

3) Adding a catalyst:

Catalyst increases the rate of the reaction without affecting the equilibrium position.Catalyst increases the rate via lowering the activation energy of the reaction.This can occur via passing the reaction in alternative pathway (changing the mechanism).The activation energy is the difference in potential energies between the reactants and transition state (for the forward reaction) and it is the difference in potential energies between the products and transition state (for the reverse reaction).in the presence of a catalyst, the activation energy is lowered by lowering the energy of the transition state, which is the rate-determining step, catalysts reduce the required energy of activation to allow a reaction to proceed and, in the case of a reversible reaction, reach equilibrium more rapidly.with adding a catalyst, both the forward and reverse reaction rates will speed up equally, which allowing the system to reach equilibrium faster.

so, the right match is: B) No effect.

Question 2: Nitrogen dioxide gas is dark brown in color and remains in equilibrium with dinitrogen tetroxide gas, which is colorless.

2NO2(g) ⇌ N2O4(g)

When the light brown color equilibrium mixture was moved from room temperature to a lower temperature, the mixture turned lighter brown in color. Which of the following conclusions about this equilibrium mixture is true?

Moving from room temperature to a lower temperature, means that the T is decreased.The mixture turned lighter brown in color, means that the reaction is shifted towards the products side.Moving towards the product side, means that we decreased the concentration of the product side, which ,means that the heat is evolved from the reaction and the reaction is exothermic.

So, the right choice is: This reaction is exothermic because the system shifted to the right on cooling.

Question 3: According to Le Châtelier's principle, how will a decrease in concentration of a reactant affect the equilibrium system?

A decrease in the reactants concentration will disturb the equilibrium position of the system. To attain the equilibrium again, the system will be shifted to the lift (reactants side) to increases the concentration of the reactants and attain the equilibrium again.

So, the right choice is: Shift it toward the reactants.

Note: The answer of Q 4, 5, 6 & 7 and all answers are in the attached word file.

Answer from: Quest

the answer is c.) 1575 j.

explanation:

Answer from: Quest

The answer is d- principle of faunal succession.

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Question 1 (matching worth 3 points)
(07.07 mc)

match the action to the effect on...

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