Rates Catalyst L4

Define 'Rate of Reaction'.

• The speed of a reaction.

• The temperature of a reaction.

• The pressure of a reaction.

• The volume of a reaction.

Reactions take place when particles collide with a certain amount of ________.

• energy

• mass

• volume

• pressure

What is a catalyst?

• A substance that increases the rate of a chemical reaction without getting used up itself.

• A substance that decreases the rate of a chemical reaction and is consumed in the process.

• A substance that is formed as a product in a chemical reaction.

• A substance that is used up in a chemical reaction to produce energy.

Which of the following factors affect the rate of reactions?

• Increased temperature

• Increased concentration

• Increased surface area

• Use of a catalyst

What do catalysts provide for reactions?

• Catalysts provide an alternative reaction pathway with a lower activation energy for reactions.

• Catalysts increase the temperature of the reaction.

• Catalysts are consumed in the reaction.

• Catalysts provide energy to the reactants.

One benefit of using catalysts in industry is:

• They increase the rate of chemical reactions.

• They decrease the rate of chemical reactions.

• They are consumed in the reaction.

• They increase the cost of production.

What is the role of catalysts in chemical reactions?

• They increase the rates of reactions without being chemically changed or used up.

• They decrease the rates of reactions.

• They are consumed in the reaction.

• They change the product of the reaction.

How much catalyst is needed to catalyse a huge amount of reactants?

• A large amount

• A small amount

• An equal amount

• None

What can chemically change the catalyst in industrial processes?

• Temperature changes

• Pressure changes

• Chemical impurities

• Mechanical forces

What are enzymes?