Question 1

1. When will chemical reactions come to a stop?

Accepted Answer

A. Not enough energy for the reaction.

Answer

B. The amount of catalyst was consumed already.

Answer

C. More than 3 reactants collide frequently.

Answer

D. Sufficient activation energy is present.

Question 2

2. Why it is better to use a chicken broth cube cut into 4 equal parts rather than a whole cube in cooking?

Accepted Answer

D. The chicken broth cube cut into 4 equal parts could react faster in giving flavoring in cooking

Answer

A. The whole cube makes the reaction in cooking faster.

Answer

B. The whole cube provides flavoring in cooking at a faster rate.

Answer

C. The chicken broth cube cut into 4 equal parts slows down the cooking process.

Question 3

3. Which one of the following statements concerning rates of reactions is TRUE?

Accepted Answer

C. More collisions among atoms and molecules, greater reaction occurs.

Answer

B. The higher the activation energy barrier, the faster the reaction.

Answer

A. Adding a catalyst slows down the rate of reaction.

Answer

D. Increasing the concentration of a reactant may decrease the rate of a reaction.

Question 4

4. Which of the following could explain the rotting of sliced apples when not being refrigerated?

Accepted Answer

D. Temperature

Answer

A. Catalyst

Answer

C. Surface Area

Answer

B. Concentration

Question 5

5. When the concentration of reactant molecules is increased, the rate of reaction increases. Which of the following best describes this?

Accepted Answer

C. The frequency of molecular collisions increases.

Answer

D. The average kinetic energy of molecules decreases.

Answer

B. The activation energy increases.

Answer

A. The rate constant increases.

Question 6

6. Which is the best way to cook a kilo of whole beef shanks faster?

Accepted Answer

D. Use high temperature while cooking beef shanks.

Answer

B. Retainthe original size of the beef shanks.

Answer

C. Use a low temperature while cooking beef shanks.

Answer

A. Cut the beef shanks into two parts.

Question 7

7. The higher the temperature is, the faster is the rate of reaction because …

Accepted Answer

A. more molecule collides with other molecules.

Answer

C. molecules become smaller in size.

Answer

D. molecules become larger.

Answer

B. less molecule collides with other molecules

Question 8

8. Which concentration of ethyl alcohol is better to use for disinfection?

Accepted Answer

D. 70%

Answer

A. 20%

Answer

C. 50%

Answer

B. 30%

Question 9

9. Which of the following should be added in making bread to have a better dough?

Accepted Answer

A. baking powder

Answer

C. Flour

Answer

D. yeast

Answer

B. baking soda

Question 10

10. Which of the following greatly affects chemical reaction in processing milk?

Accepted Answer

B. Concentration of the reactants

Answer

A. Catalyst

Answer

C. Surface area of the reactant

Answer

D. Temperature

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