超星 - module 6 quiz and assignment

单选题

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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单选题

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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单选题

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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单选题