Question 1

1. When will chemical reactions come to a stop?

Accepted Answer

Not enough energy for the reaction.

Answer

Sufficient activation energy is present.

Answer

More than 3 reactants collide frequently.

Answer

The amount of catalyst was consumed already.

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

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

Answer

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

Answer

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

Answer

The whole cube makes the reaction in cooking faster.

Question 3

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

Accepted Answer

More collisions among atoms and molecules, greater reaction occurs.

Answer

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

Answer

Adding a catalyst slows down the rate of reaction.

Answer

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

Temperature

Answer

Concentration

Answer

Surface area

Answer

Catalyst

Question 5

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

Accepted Answer

The frequency of molecular collisions increases.

Answer

The rate constant increases.

Answer

The average kinetic energy of molecules decreases.

Answer

The activation energy increases.

Question 6

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

Accepted Answer

Cut the beef shanks into two parts.

Answer

Retain the original size of the beef shanks.

Answer

Use a low temperature while cooking beef shanks.

Answer

Use high temperature while cooking beef shanks.

Question 7

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

Accepted Answer

more molecules collides with other molecules.

Answer

molecules become larger.

Answer

less molecule collides with other molecules.

Answer

molecules become smaller in size.

Question 8

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

Accepted Answer

70%

Answer

50%

Answer

20%

Answer

30%

Question 9

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

Accepted Answer

yeast

Answer

baking soda

Answer

baking powder

Answer

flour

Question 10

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

Accepted Answer

Temperature

Answer

Concentration of the reactants

Answer

Catalyst

Answer

Surface area of the reactant

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