Reactions: Chemical Reaction Rates

The video tutorial explains how various factors affect the rate of chemical reactions. It begins with an example of frying an egg to illustrate a chemical reaction. The tutorial then explores how temperature, concentration, and surface area can influence reaction rates, using examples like glow sticks, gas combustion, and fire. Finally, it discusses the role of catalysts and enzymes in speeding up reactions without being consumed.

What happens to the reaction rate when the temperature is increased?

• It remains the same.

• It increases.

• It stops completely.

• It decreases.

How does the concentration of reactants affect the rate of a chemical reaction?

• Lower concentration increases the reaction rate.

• Concentration has no effect on reaction rate.

• Higher concentration increases the reaction rate.

• Higher concentration decreases the reaction rate.

Which scenario will result in a faster reaction: a large piece of wood or many small pieces?

• Both will burn at the same rate.

• Many small pieces.

• Neither will burn.

• A large piece of wood.

What role do catalysts play in chemical reactions?

• They have no effect on the reaction rate.

• They increase the reaction rate without being consumed.

• They are consumed by the reaction.

• They slow down the reaction.

Why do enzymes in our body allow reactions to occur quickly?

• They reduce the surface area.

• They increase the concentration of reactants.

• They decrease the temperature.

• They act as catalysts to speed up reactions.