Post Test: Module 5 SCI10-Science 10 4Q KNHS
Quiz by Jerald U. Carilla
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- Q1
1. When will chemical reactions come to a stop?
Sufficient activation energy is present.
Not enough energy for the reaction.
More than 3 reactants collide frequently.
The amount of catalyst was consumed already.
30s - Q2
2. Why it is better to use a chicken broth cube cut into 4 equal parts rather than a whole cube in cooking?
The chicken broth cube cut into 4 equal parts could react faster in giving flavoring in cooking.
The chicken broth cube cut into 4 equal parts slows down the cooking process.
The whole cube provides flavoring in cooking at a faster rate.
The whole cube makes the reaction in cooking faster.
30s - Q3
3. Which one of the following statements concerning rates of reactions is TRUE?
The higher the activation energy barrier, the faster the reaction.
Adding a catalyst slows down the rate of reaction.
Increasing the concentration of a reactant may decrease the rate of a reaction.
More collisions among atoms and molecules, greater reaction occurs.
30s - Q4
4. Which of the following could explain the rotting of sliced apples when not being refrigerated?
Concentration
Surface area
Temperature
Catalyst
30s - Q5
5. When the concentration of reactant molecules is increased, the rate of reaction increases. Which of the following best describe this?
The rate constant increases.
The average kinetic energy of molecules decreases.
The activation energy increases.
The frequency of molecular collisions increases.
30s - Q6
6. Which is the best way to cook a kilo of whole beef shanks faster?
Cut the beef shanks into two parts.
Retain the original size of the beef shanks.
Use a low temperature while cooking beef shanks.
Use high temperature while cooking beef shanks.
30s - Q7
7. The higher the temperature is, the faster is the rate of reaction because …
molecules become larger.
more molecules collides with other molecules.
less molecule collides with other molecules.
molecules become smaller in size.
30s - Q8
8. Which concentration of ethyl alcohol is better to use for disinfection?
50%
70%
20%
30%
30s - Q9
9. Which of the following should be added in making bread to have a better dough?
baking soda
baking powder
flour
yeast
30s - Q10
10. Which of the following greatly affects chemical reaction in processing milk?
Concentration of the reactants
Catalyst
Surface area of the reactant
Temperature
30s