EXAM VI (QUIZ REVIEW)

What will happen when additional reactant is added to a system at equilibrium?

a) more products will form

At chemical equilibrium. which of the following is always true of the concentration of reactants and products?

a) they are constant

The statement “Equilibrium lies to the right” meant that at equilibrium

a)product concentrations are much greater than reactant concentrations.

When equilibrium lies to the right, Keq is

c) much greater than 1

What is equilibrium constant for the general equation aA + bB ⇄  cC +dD?

 K =\[C\]c\[D\]d/\[A\]a\[B\]b, 

A heterogeneous equilibrium is one in which the substances are

d) in different states

Chemical equilibrium exists when

d) two opposing processes occur at the same right

Refer to Figure 16-2. What is the equilibrium constant for the system?

d) \[AB\]/ \[A\] \[B\]

How would a reduction in volume of the container in the figure above affect the concentration of AB, assuming the other conditions are kept constant?

A) \[AB\] would increase.

How would an increase in temperature affect the concentration of AB, assuming the other conditions are kept constant?

b) \[AB\] would decrease

In the figure is the forward reaction exothermic and endothermic?

b) the forward is endothermic

In the figure is the reverse reactions exothermic or endothermic?

c) the reverse exothermic

What is the value of  ΔH for the reverse reaction in the figure?

c) -200 KJ

Where would the kilojoules of heat be placed for the reversed thermochemical reaction in the figure?

a) with products

What is the activation energy for the forward reaction in the figure?

d) +300 KJ

What is happening to the enthalpy of `the` ice in diagram 3?

b) there is an increase in entalphy

What is happening to the enthalpy of the liquid substance in diagram 1?

d) There is an increase in enthalpy

What is happening to the enthalpy of the liquid substance in diagram 3?

c) there is a decrease in enthalpy

If 335g water at 22.5 C loses 9750 J of heat, what is the final temperature of the water.

c) 18.5 C

The temperature of a sample of water increases from 25.0 C to 50.0 C as it absorbs 50.0 calories of energy. What is the mass of the sample.

2\.0 g

According to the collision theory

d) both molecular orientation and energy level must be right for a reaction to occur

What is the general relationship between concentration and reaction rate?

a) the higher concentration, the higher the reaction rate

The symbol used to represent concentration is

d. \[ \]

Activation energy equals the

b) difference between the peak energy and the energy of the reactants

the symbol used to represent “change in” is

c)  **Δ**

What is the general relationship between temperature and reaction rate?

a) The higher the temperature, the higher the reaction rate

Chemical kinetics is mainly concerned with

a) reaction rate

reaction rate is the change in

d) concentration per unit time

In order for molecules to react with one another, they must

c) collide

What factors account for the fact that powdered sugar dissolve more quickly than granulated sugar under the same conditions?

d) surface are