Question

According to the collision theory of chemical reactions, an increase in the number of effective reactant collisions per unit time will increase the rate of the reaction.

TRUE
FALSE


You can study reaction rates to answer which of the following questions?

Will the reaction go to completion?
Will the reaction occur?
How can the reaction be slowed down?
How many grams of product will be made?

Changing the concentration of one or more of reactants can affect the rate of a reaction.

TRUE
FALSE

If the surface area of reactants decreases:

The reaction rate is generally lower.
The reaction rate is generally higher.
The reaction rate is not affected.
The effect on reaction rate cannot be predicted.

Which of the following would increase the rate of a chemical reaction?

Reducing the temperature
Increasing volume
Using reactants in fine, powder form, rather than large, chunky form
Decreasing reactant concentration

In an energy diagram for an endothermic reaction, the products are higher in energy than the reactants.

TRUE
FALSE

A catalyst works by increasing the activation energy needed for a reaction.

TRUE
FALSE

Answer 1

1. true, more effective collisions per second. Faster reaction
2. How can the reaction be slowed down? (talking about how fast or slow the reaction is)
3. True
4. Rate lower if surface area decrease
5. Fine powder form
6. True
7. False
Image questions:
1. False
2. Energy of reactants higher than products.

Answer 2

Answer:

1. True

2. How can the reaction be slowed down?

3. True

4. The reaction rate is generally lower.

5. Using reactants in fine, powder form,

6. True

7. False

From the image:

1. False

2. Energy of combined reactants is higher than combined products.

Explanation:

1. The rate of reaction is govern by the number of effective reactant collisions per unit time. so if the collisions increases, the rate of reaction must increase.

2. 

Will the reaction go to completion?

Ans: The extent of reaction is studied in chemical equilibrium

Will the reaction occur?

Ans: the spontaneity of reaction is studied in thermodynamics

How many grams of product will be made?

This is stoichiometry of reaction.

3.  The rate of reaction changes with change in concentration of reactants if the reaction is not of zero order,

4. The higher surface are gives more surface molecules which increases reactivity so if we decrease surface area the reaction rate will decrease.

5. The higher surface are gives more surface molecules which increases reactivity so in fine powder form the reaction rate will be more.

6. For endothermic reaction there is absorption of heat, so the energy of products is more than the energy of reactants.

7. The catalyst gives an alternate path to reaction where activation energy is low.

From imageL

1. B is the arrow which shows lower activation energy and hence presence of catalyst.

2. It is well clear that energy of reactants is higher than products.