1. Which of the following will decrease the rate of the reaction? Select one: (n

Question

1. Which of the following will decrease the rate of the reaction?

Select one: (no explanations needed)

A. Decrease the concentration of the reactants

B. Decrease the activation energy

C. Add a catalyst

D. Increase the temperature

2. Sulfur reacts with oxygen to produce sulfur dioxide, but only if the high activation energy is supplied. Which condition will lower the activation energy the most?

Select one:

A. using a catalyst

B. stirring the mixture

C. activation energy cannot be lowered

D. heating the mixture

3. Ice has a __________ entropy than that of liquid water.

Select one:

a. the same

b. lower

c. ice is a solid and has no entropy

d. higher

4. Which of the following is NOT a condition used by the Haber-Bosch process to create ammonia?

Select one:

a. low temperature

b. continual removal of product

c. high pressure

d. high temperature

5. In an exergonic process, the system:

Select one:

a. gains energy

b. no energy at all

c. loses energy

d. either gains or loses energy

6. Molecular Collision theory states 3 conditions. Which of the following is NOT a condition of Molecular Collision theory?

Select one:

a. a catalyst must be used to create collisions

b. collisions must have proper orientation of the molecules to react

c. collisions have to have sufficient energy when colliding to react

d. molecules must have collisions

7. If kinetic energy increases, will collisions increase?

Select one:

a. Yes

b. No

c. Kinetic energy and collisions are not related

Explanation / Answer

1) answer : A.) Decrease the concentration of the reactants

explanation: rate of the reaction directly proportional to concentration of reactants. if reactants concentration increases rate increases. reactant concentration decreases rate also decreases.

2) answer: A.) using a catalyst

explanation: the main purpose of catalyst which reduce the activation energy . the catalyst the chemical substace which decrease the activation energy

3) answer : b. lower

explanation: ice is solid . the randomness of H2O molecules in ice are negligble compared to water so ice has lesser entropy

4) answer : d. high temperature

explanation:    haber process exothermic process exothermic reaction favours at lower temperatures only .so d) is wrong one

5) answer : c. loses energy

6) answer : a. a catalyst must be used to create collisions

7) answer : a) Yes

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