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- Q1
When will chemical reactions come to a stop?
Sufficient activation energy is present.
The amount of catalyst was consumed already.
Not enough energy for the reaction.
More than 3 reactants collide frequently.
30s - Q2
Why it is better to use a chicken broth cube cut into 4 equal parts rather than a whole cube in cooking?
The whole cube makes the reaction in cooking faster.
The chicken broth cube cut into 4 equal parts slows down the cooking process.
The chicken broth cube cut into 4 equal parts could react faster in giving flavoring in cooking.
The whole cube provides flavoring in cooking at a faster rate.
45s - Q3
Which one of the following statements concerning rates of reactions is TRUE?
More collisions among atoms and molecules, greater reaction occurs.
Adding a catalyst slows down the rate of reaction.
The higher the activation energy barrier, the faster the reaction.
Increasing the concentration of a reactant may decrease the rate of a reaction.
45s - Q4
Which of the following could explain the rotting of sliced apples when not being refrigerated?
Temperature
Surface area
Concentration
Catalyst
45s - Q5
When the concentration of reactant molecules is increased, the rate of reaction increases. Which of the following best describe this?
The activation energy increases.
The rate constant increases.
The average kinetic energy of molecules decreases.
The frequency of molecular collisions increases.
45s - Q6
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 high temperature while cooking beef shanks.
Use a low temperature while cooking beef shanks.
45s - Q7
The higher the temperature is, the faster is the rate of reaction because …
molecules become smaller in size.
less molecule collides with other molecules.
more molecules collides with other molecules.
molecules become larger.
45s - Q8
Which concentration of ethyl alcohol is better to use for disinfection?
70%
50%
30%
20%
45s - Q9
Which of the following should be added in making bread to have a better dough?
baking soda
flour
yeast
baking powder
45s - Q10
Which of the following greatly affects chemical reaction in processing milk?
Surface area of the reactant
Catalyst
Concentration of the reactants
Temperature
45s