Chemical Kinetics and Equilibrium Questions I don\'t understand these concepts.

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Chemical Kinetics and Equilibrium Questions

I don't understand these concepts. Can someone explain why each right answer is correct? (5 Questions total)

4) For the reaction: CH4(g) + 2H20(g)<=> CO2(g) + 4H2(g) H°= +190 kJ raise the temperature to 1200 K:

A) the temperature increases.

C) the H° increases.

D) the reaction reacts to the right.

E) there is no change.

6) For a reaction, the reaction quotient, Qc> K, the reaction:

B) is exothermic

C) is at equilibrium

D) shifts to the left

E) is endothermic

10) For the reaction: CH4(g) + 2H2O(g) <=> CO2(g) +4H2(g) H° = +190 kJ when Pressure is decreased:

A) the H° increases.

B) the reaction reacts to the right.

D) the temperature increases.

E) there is no change.

12) For the reaction; N2(g) + 3H2(g) 2NH3(g), the equilibrium amount of NH3 will be increased by:

I. increasing the pressure

II. adding H2

III. removing N2

IV. decreasing the pressure

A) II, IV B) I, II, D) I, III E) III only

23) If increasing the concentration of A by 2 fold in a chemical reaction causes no increase in the rate of the reaction, then we may say:

A) the reaction rate is second order in [A]

C) the reaction rate is zero order in [A]

D) A is a catalyst

E) A is not involved in the reaction

Explanation / Answer

4) D is correct answer as the reaction is endothermic, increasing temperature will shift equilibrum towards right.

6)D is correct answer as no. Of moles of products is more than no.of moles of reactants.

10) B is correct answer as lechatleayers principal suggest that if no. Of moles of gaseous products is more than reactants, lowering pressure will shift equilibrum towards forward direction.

12) B is the correct answer, because no. Of moles of reactants is more than no.of moles of products so by increasing pressure will shift equilibrum towards forward direction as per lechatleayers principal.Further, addition of H2 will shift reaction towards forward direction as it is involved in the reactant side , increaxinc concentration of reactants also favours forward direction.

23) C is the correct answer because if changing concentra doesn't effect the rate of reaction, the rate with respect to that reactant is zero.

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