Summative test

Why is refrigeration used to preserve food?

• Refrigeration increases the activation energy of spoilage reactions.

• Refrigeration increases the concentration of reactants involved in spoilage.

• Refrigeration decreases the collision frequency of molecules involved in spoilage.

• Refrigeration increases the surface area of food, promoting spoilage.

How does increasing the surface area of a solid reactant speed up a reaction, such as in combustion?

• It increases the activation energy required.

• It decreases the number of reactant collisions.

• It increases the frequency of reactant collisions.

• It lowers the temperature of the reaction.

Why is it important to control the temperature when producing certain materials, like plastics?

• Temperature has no effect on reaction rates in material production.

• High temperatures always speed up reactions, regardless of the material.

• Precise temperature control ensures the desired reaction rate and product formation.

• Lower temperatures always slow down reactions, leading to better quality materials.

How does a fire extinguisher work to control fire?

• It removes oxygen from the reaction, starving the fire.

• It increases the concentration of oxygen, fueling the fire.

• It increases the surface area of the fuel, promoting combustion.

• It raises the temperature, accelerating combustion.

Why are catalysts used in many industrial processes?

• Catalysts increase the activation energy of the reaction.

• Catalysts increase the reaction rate without being consumed.

• Catalysts decrease the concentration of reactants.

• Catalysts increase the temperature of the reaction.

How does the use of inhibitors help prevent corrosion?

• Inhibitors increase the concentration of reactants.

• Inhibitors increase the rate of oxidation

• Inhibitors slow down the corrosion reaction.

• Inhibitors increase the surface area available for corrosion.

Why is it crucial to monitor and control the concentration of reactants in many chemical processes?

• Concentration has no significant impact on reaction rates.

• Higher concentrations always lead to faster reactions, regardless of the process.

• Precise concentration control ensures the desired reaction rate and product yield.

• Lower concentrations always lead to slower reactions, which is always desirable.

Why are certain chemical reactions carried out at low temperatures?

• Low temperatures can slow down unwanted side reactions.

• Low temperatures always speed up reactions.

• Low temperatures increase the activation energy.

• Low temperatures increase the concentration of reactants.

How does proper ventilation help reduce indoor air pollution from chemical reactions?

• Ventilation increases the concentration of pollutants.

• Ventilation decreases the concentration of reactants involved in the pollution-causing reactions..

• Ventilation increases the temperature, accelerating pollution-causing reactions.

• Ventilation has no effect on the rate of chemical reactions.

How does using a pressure cooker speed up the cooking process?

• It decreases the concentration of reactants.

• It decreases the collision frequency of molecules.

• It increases the pressure, increasing the collision frequency of molecules.

• It lowers the temperature of the cooking process.