Chemical Reaction Rate Quiz

Which of the following statements best describes Collision Theory?

• Atoms or molecules must collide with sufficient amount of energy in order to react.

• Catalyst can be recovered unchanged at the end of the process

• Increasing the concentration of a reactant increases the rate of reaction.

• Smaller pieces have a greater surface area, thus, providing much greater contact among the reactants and effecting more collisions.

How will you increase the rate of a chemical reaction?

• add catalyst

• decrease the concentration of reactants

• decrease the temperature of reactants

• increase the surface area of reactants

The amount of energy required to break the bonds between the reacting molecules is known as _______.

• Activated Complex

• Activation Energy

• Collision Theory

• Law of Conservation of Mass

One of the factors that affect the rate of chemical reaction is concentration of solution. Describe this factor.

• It is the measure of the number of particles of solute in a given volume of solution.

• It is located at the peak of the energy diagram for a reaction.

• It is the amount of energy needed for molecules to react.

• It is needed to break the bonds of the reactants to form new products or new substances.

How will crushing a solid into a powder increase reaction rate?

• The activation energy barrier will be lowered.

• The orientation of colliding particles will be improved.

• The particles will collide with more energy.

• The powdered form has more surface area.

The rate of reaction increases as the temperature increases. Which of the following statements provides the best explanation for this?

• At higher temperature, the particles have more energy, move faster and collide more often.

• At lower temperature, the particles do not collide with each other.

• Higher temperature has higher activation energy.

• Increasing the temperature increases the number of particles, so they collide more often.

When a lit match touches the wick of a candle, it begins to burn. When the match is removed, the candle continues to burn. The match ____________.

• behaves as a catalyst

• increases the concentration

• lowers the activation energy barrier

• supplies the activation energy

Perishable goods that are not properly stored show signs of spoilage in less than a day. Which of the following is not a possible cause of this spoilage?

• amount of goods

• change in temperature

• oxygen in air

• presence of microorganisms

Filipino farmers use different natural ripening agents such as the use of kalburo, leaves of kakawate and acacia leaves. This practice intends to address the need for the availability of fruits all the time. What factor affecting the rate of reactions influences this situation?

• catalyst

• concentration of reactants

• particle size

• temperature

To remove clothes stains faster, one either uses higher amounts of calamansi extract or laundry bleach. What factor influences this situation?

• concentration of the reactants

• presence of catalyst

• size of the reactants

• temperature