Worksheet 15 b 1)When a reaction is at equilibrium, a) it has no products b) the

Question

Worksheet 15 b 1)When a reaction is at equilibrium, a) it has no products b) the rate of the forward reaction is equal to the rate of its reverse. c) it occurs very quickly using up all of the d) it produces the same amount of product as reactant 2) The equation: C(S)g)CO) has the following equilibrium constant expression. a) b) c) d) ICO [O,1 CO 3) in which reaction bel low are reactant concentrations greater than product concentrations? 10 KHO-2.5 x 10 Keq =[E][Hs01-6.6 x 10 HI] HF] 4) Why might increasing the concentration of a set of reactants increase the rate of reaction? a. You have increased the chances that any two reactant molecules will collide and react. b. You have increased the ratio of reactants to products c. The concentration of reactants is unrelated to the rate of reaction. d. The rate of reaction depends only on the mass of the atoms and therefore increases as you increase the mass of the reactants. None of the above e. 5) Which of the following energy diagrams represents the reaction that would proceed the fastest? lal tbl lc) 6) For the equilibrium reaction shown, determine if the reverse reaction will occur until equilibrium is reestablished: 2502(g)+O+lg) 2S0 (g) (answer yes or no) a. [SO,J is decreased c. [SO3] is decreased b. [SO:] is increased d. [O:l is increased

Explanation / Answer

1) When a reaction is at equilibrium,

b. the rate of the forward reaction is equal to the rate of reverse

The equilibrium is when their is not further change in either reactant or the product concentration.

2) For the given reaction, the equilibrium constant expression would be,

b. Keq = [CO2]/[O2]

solids and aqueous solutions do not form part of equilibrium constant expression.

3) The reaction wherein the concentration of reactants is higher than the concentration of products is,

b. The equilibrium constant for this reaction is less than 1, that is denominator with reactant concentrations is greater the numerator product concentrations.

4) Increasing the reaction temperatures also increases the rate of the reaction, this is due to the fact that,

a. You have increased the chanes that any to reactant moelcules may collide

Supplying heat increses average kinetic energy of the reactant molecules so they collide with greater probability.

5) The reaction diagram showing fastest reaction would be,

b.

Here no formation of transition state occurs, reactant goes directly to form more stable products.

6) for the equilibrium reaction, the effect of following on reversibility to form reactants until equillibrium is reestablished according to the LeChaterllier's principle,

a. [SO2] is decreased : Yes

b. [SO2] is increased : No

c. [SO3] is decreased : No

d. [O2] is increased : No

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