Rate Of Reaction(General Knowledge > General Science ) Questions and answers for exam Preparation

Question 1. What criteria must be met for reactant collisions to result in a successful product?

The reactants must collide with each other
The reactants must collide with enough energy and be in the right positions
The reactants must have enough energy to form the activated complex
None of these

Explanation:-

Answer: Option B. -> The reactants must collide with enough energy and be in the right positions

Question 2. Smaller particle size allows for a _________ surface area to be exposed for the reaction

larger
smaller
rectangular
spherical

Explanation:-

Answer: Option A. -> larger

Question 3. Products will form faster if____________

the particle size of the reactants are larger.
temperature is decreased.
concentration of the reactants are increased.
the reaction is not stirred.

Explanation:-

Answer: Option C. -> concentration of the reactants are increased.

Question 4. Pick the TWO (2) options that will INCREASE the rate of a reaction

Adding Heat
Adding Catalyst
Removing Catalyst
Both A & B

Explanation:-

Answer: Option D. -> Both A & B

Question 5. The following equation shows the reaction between calcium carbonate, CaCO3 and hydrochloric acid, HCl:CaCO3(aq) + 2HCl(aq) → CaCl2(aq) + CO2 (g) + H2O(l)Which of the following is the suitable method to measure the rate of reaction?

Change in the temperature of the solution with time
Change in the volume of carbon dioxide gas with time
Change in the mass of water with time
Change in the concentration of hydrochloric acid with time

Explanation:-

Answer: Option B. -> Change in the volume of carbon dioxide gas with time

Question 6. To slow down a chemical reaction you will do one of the following:

Place the reactants in hot water
Place the products in ice bath
Place the reactants in an ice bath
Keep stirring the reactants with a stirring rod

Explanation:-

Answer: Option C. -> Place the reactants in an ice bath