Factors Affecting Reaction Rates

The video tutorial explores factors affecting the speed of chemical reactions, including surface area, temperature, concentration, and catalysts. It explains how increasing surface area and temperature can accelerate reactions, while lowering them can slow reactions. The role of concentration in increasing collision frequency and the function of catalysts in providing alternative pathways with lower activation energy are also discussed.

Why do we store food in the refrigerator?

• To increase the temperature

• To change the taste of the food

• To slow down chemical reactions

• To speed up chemical reactions

What happens when you cut food into smaller pieces before cooking?

• It cooks more slowly

• It cooks at the same rate

• It cooks more quickly

• It doesn't cook at all

How does increasing the surface area of a reactant affect the reaction rate?

• It stops the reaction

• It decreases the reaction rate

• It has no effect on the reaction rate

• It increases the reaction rate

Why does a steel wool rust faster than a nail?

• Because it is heavier

• Because it has a larger surface area

• Because it is made of a different material

• Because it is exposed to less oxygen

What is the effect of increasing temperature on the reaction rate?

• It stops the reaction

• It decreases the reaction rate

• It has no effect on the reaction rate

• It increases the reaction rate

Why do we use a pressure cooker to cook food faster?

• It changes the taste of the food

• It decreases the pressure

• It increases the temperature

• It decreases the temperature

What happens to the reaction rate when the concentration of reactants is increased?

• It decreases

• It stops

• It remains the same

• It increases

What is the role of a catalyst in a chemical reaction?

• It decreases the reaction rate

• It has no effect on the reaction rate

• It increases the reaction rate

• It stops the reaction

Which enzyme in saliva helps in the hydrolysis of starch?

• Lipase

• Amylase

• Cellulase

• Protease

Why are catalysts important in the chemical industry?

• They slow down reactions

• They change the products of reactions

• They make reactions more expensive

• They make some reactions feasible by increasing their rates