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For full credit please respond by Monday 5/29 at 11:59pm

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Which of the following correctly describes a system at equilibrium?

1 point

All reactions stop at equilibrium.

Reactions continue to occur, but there are no detectable changes in the concentration.

Reactions continue to occur and concentrations can increase or decrease.

Reactions continue to occur, decreasing all concentrations.

Clear selection

Which of the following is required for a reaction to reach equilibrium?

1 point

The reaction must be reversible.

The reaction must have only one reactant.

The products and reactants must be equal in concentration.

The forward reaction.

Clear selection

Consider an initial concentration of 5 moles of A and 2 moles of B for the reaction A <-> B. If 40% of molecule A reacts each minute, and 25% of molecule B reacts each minute, calculate the concentration of A after one minute.

3 points

2 moles

.5 moles

3 moles

1.5 moles

3.5 moles

4 moles

5.5 moles

Clear selection

In general, increasing temperature causes the rate of most chemical reactions to:

1 point

increase

decrease

have no change

vary unpredictably

Clear selection

What would decrease the rate of most chemical reactions?

1 point

Increasing temperature.

Adding a catalyst.

Increasing particle size.

Increasing concentration.

Clear selection

Catalysts alter the rate of a chemical reaction by:

1 point

Increasing the number of collisions between reactants

Increasing the kinetic energy of each reactant

Lowering the activation energy barrier

Being consumed by the reaction.

Clear selection

True or False. Increasing the concentration of particles in a system reduces the rate of collision and the rate of the reaction.

1 point

True

False

Clear selection

Which of the following scenarios would result in an decrease of the reaction rate?

1 point

Cooling the system

Decreasing the particle size

Adding a catalyst

Adding additional molecules.

Clear selection

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