题目内容

A chemical system is considered to have reached equilibrium when:

A. the frequency of collisions between the reactant molecules is equalto the frequency of collisions between the product molecules.
B. the rate of production of each of the product species is equal to therate of consumption of each of the product species by the reversereaction.
C. the activation energy of the forward reaction is equal to theactivation energy of the reverse reaction.
D. the sum of the concentrations of each of the reactant species isequal to the sum of the concentrations of each of the productspecies.

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Given the reaction at equilibrium: CO(g) + 2H2(g) ⇌ CH3OH(g) + heatWhich change will shift the equilibrium to favour the products?

A. adding a catalyst
B. adding more H2(g)
C. decreasing the pressure
D. increasing the temperature

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Predict the effect of increasing the volume of the reaction vessel onthe amount of reactants and products in the following:2CH4(g) ⇌ C2H2(g) + 3H2(g)

A. increased products, decreased reactants,
B. decreased products, increased reactants
C. decreased reactants and products
D. increased products; no change in reactant

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For the reaction 2H2S(g) ⇌2H2(g) + S2(g)at a particular temperature,K = 1.6 x 10-2What is the value of K for:½ S2(g) + H2(g) ⇌ H2S(g)

A. 2.62 x 10-4
B. 1.26
C. 7.9
D. 3.8 x 103
E. 61.7

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For the equilibrium system,2SO2 (g) + O2 (g) ⇌ 2SO3 (g), the result ofremoving someSO3(g) from the system is that:

A. more SO3(g) is produced to replace that which is removed
B. Kc decreases
C. more SO2 (g) and O2 (g) are produced
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