3rd Summative Examination in Physical Science 11

What do you call the amount of substance per unit volume?

• A. Concentration

• B. Density

• C. Surface area

• D. Temperature

How does a catalyst speed up a reaction?

• A. By raising the activation energy

• B. By lowering the activation energy

• C. By decreasing the collision probability

• D. By increasing the collision probability

What happens to a catalyst during a chemical reaction?

• A. It stays the same.

• B. It reacts with the reactants.

• C. It is present all throughout.

• D. It participates in the formation of products.

What do you call the minimum energy requirement needed for a chemical reaction to occur?

• A. Activation Energy

• B. Kinetic Energy

• C. Chemical Energy

• D. Potential Energy

According to collision theory, what should happen to the molecules of the reactants for a certain chemical reaction to occur?

• A. Colliding with one another

• B. Reacting with one another

• C. Clustering with one another

• D. Rearranging with one another

It is the maximum amount of product you would expect from a reaction based on the amount of limiting reagent.

• A. Theoretical yield

• B. Limiting Reactant

• C. Excess Reactant

• D. Product Difference

In the equation Mg + O2(g) → MgO, how many molecules of Mg on the reactant side do we need to make our equation balance?

• A. 1

• B. 2

• C. 3

• D. 4

What do you call the measure of the average kinetic energy of molecules?

• A. Mass

• B. Speed

• C. Surface Area

• D. Temperature

What is the calculation of the relationship of reactant and product in a chemical equation?

• A. Molality

• B. Stoichiometry

• C. Balancing Equation

• D. Percent Yield

It is the reactant that produces a lesser amount of product.

• A. Excess Reactant

• B. Percent Yield

• C. Limiting Reactant

• D. Co-Factor