AnswersChemistry Credit Recovery BEnthalpy of Reaction

Enthalpy of Reaction — Unit test Answers

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Consider the chemical reaction in equilibrium. aA(aq) + bB(aq) cC(aq) + dD(aq) According to Le Chatelier’s principle, which statement correctly completes the table below? Change Effect on equilibrium constant (K) Increase in concentration of products Value of K does not change Increase in temperature Value of K also changes Increase in pressure ?

Question illustration
A
value of K does not change
B
value of K increases
C
value of K decreases
D
value of K oscillates
22
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Consider the reaction below.Which is most likely the effect to the forward reaction if there is an increase in pressure of the system?

Question illustration
A
The reactant surface area increases.
B
The reaction rate decreases.
C
The reaction is not affected at all.
D
The reaction stops completely.
23

According to Le Chatelier’s principle, what happens to the equilibrium constant (K) when the concentration of the reactants is doubled?

A
The value of the equilibrium constant (K) is doubled.
B
The value of the equilibrium constant (K) is halved.
C
The value of the equilibrium constant (K) remains the same.
D
The value of the equilibrium constant (K) changes unpredictably.
24

What is the definition of a common ion as it applies to Le Chatelier’s principle?

A
an ion that is found in a wide variety of compounds
B
an ion that is present in every sample of pure water
C
an ion that is found dissolved in most aqueous solutions that are widely used in labs
D
an ion that is present in an equilibrium system and a compound added to the system
25

Consider the following chemical equation in equilibrium. H2SO4(aq) 2H+ + SO42– What will happen to the chemical equilibrium if HCl is added to the system?

Question illustration
A
The chemical equilibrium will shift to the right.
B
The chemical equilibrium will be lost permanently.
C
The chemical equilibrium will not be affected.
D
The chemical equilibrium will shift to the left.

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