Factors Affecting the Rate of Chemical Reaction

Discarded iron materials and objects rust faster in ________________.

• Coastal Areas

• Riverbanks

• Landfills

• Deserts

An athlete sprains their ankle during a game. The coach immediately applies an ice pack to the injured area. Which of the following best explains the physiochemical reason behind this first-aid response?

• Inflammation is slower at low temperature.

• Inflammation is slower at high temperature.

• Inflammation is faster at low temperature.

• Inflammation is faster at high temperature.

In a chemical reaction, how quickly or slowly the reactants turns into products is called.

• Chemical Reaction

• Chemical Change

• Reaction Time

• Reaction Rate

A janitor uses a strong bleach solution to clean a dirty sink. He then tries a more diluted solution and observes that it takes longer to clean. What factor explains the difference in reaction rate?

• Higher concentration increases the size of the reactants.

• Lower concentration means fewer water molecules are available.

• A more concentrated solution has more reactant particles, increasing the frequency of collisions.

• Diluted solutions evaporate faster, reducing the rate of cleaning.

A student wants to speed up a chemical reaction in the lab. Which of the following would be the most effective strategy?

• Lower the temperature and use larger chunks of solid reactant.

• Increase the temperature, use a more concentrated solution, and grind the solid into a powder.

• Use less solvent to save materials.

• Let the reaction sit longer at room temperature.

When frying onions, the cook notices they brown more quickly when chopped finely compared to large slices. Which factor primarily causes this faster chemical change (caramelization)?

• Finely chopped onions have higher mass.

• Surface area increases with smaller cuts, speeding up the chemical reactions from heat.

• Larger onion slices lose flavor, affecting chemical reactions.

• The pan gets hotter with smaller onion pieces.

Which of the following will LOWER the rate of reaction?

• Adding an enzyme to the reaction

• Breaking a chunk of calcium into smaller pieces

• Lowering the temperature from 40°C to 10°C

• Increasing the amount of solute dissolved in a solution

Increasing what factor/s will cause the particles of the reactants to move more quickly so that they can collide with each other more frequently.

• Temperature

• Concentration

• Surface Area

• Catalysts