Explaining the use of catalysts

Explaining the use of catalysts

Multiple Choice

What type of chemical reaction absorbs energy and requires energy for the reaction to occur?

• Endothermic

• Exotermic

• Exothermic

• Endotermic

Multiple Choice

Is this diagram endothermic or exothermic

• Endothermic

• Exotermic

• Exothermic

• Endote

Multiple Choice

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

• The solution at the end is acidic

• The reaction is reversible

• The reaction is exothermic

• The reaction is endothermic

Catalyst

• any substance that increases the rate of a reaction without itself being consumed.

• Examples: enzymes, metal or metal oxides (iron, platinum)

Reactant

Enzymes (catalyst)

Product

Sketch the energy level diagram for exothermic reactions

Catalyst/enzymes LOWERS THE ACTIVATION ENERGY

(the energy to start a reaction)

Elephant toothpaste experiment

https://youtu.be/p5qvi20J5IM

Identify the catalyst in this reaction.

Open Ended

Identify the catalyst in the video

Open Ended

What are the advantages of using catalyst?

Open Ended

How could we find out the rate of reaction/ how fast a reaction is?

To find out the rate of reaction

1. time how quickly a product is made

2. time how quickly a reactant is used up

Catalytic converters

remove harmful gases

Platinum and rhodium in the converter remove oxides of nitrogen and convert them into nitrogen gas and oxygen gas.

Multiple Choice

Which graph plotted in Fig 3.3.11b represents the reaction with a catalyst? (Page 91 in Student book)

• A

• B

Multiple Choice

What is the name given to a catalyst in the human body?

• Biology

• Catalyst

• Chemical

• Enzyme

Multiple Choice

A substance that increases the rate of a reaction without being used up during the reaction is called a

• catalyst

• product

• reactant

• solute

Multiple Choice

How does a catalyst work in speeding up a reaction?

• By lowering the activation energy or reaction

• by giving them more energy

• by making them more available