Chemical reactions and enzymes

Multiple Choice

Why are chemical reactions and enzymes important in living organisms?

• They help organisms obtain energy and build new molecules

• They only break down harmful substances

• They have no role in living organisms

• They only occur in non-living things

Open Ended

What is the difference between reactants and products in a chemical reaction?

Multiple Choice

Which type of chemical reaction can occur spontaneously?

• A reaction that releases energy

• A reaction that absorbs energy

• A reaction that requires a catalyst

• A reaction that produces light

Multiple Choice

How do enzymes affect the activation energy of a chemical reaction?

• They lower the activation energy

• They increase the activation energy

• They do not affect activation energy

• They stop the reaction completely

Open Ended

Do you have any questions about chemical reactions or enzymes, or would you like to learn more about a specific aspect of this topic?

Multiple Select

Select all statements that are true about enzymes:

• Enzymes speed up chemical reactions

• Enzymes are used up in reactions

• Enzymes lower activation energy

• Enzymes are specific to their substrates

Match

Match the following Enzyme Concepts

• Enzyme

• Active Site

• Substrate

• Protein

• It takes more/less energy to do work when enzymes are present....

A protein that Speeds Up Chemical Reactions

The Place where the Enzyme matches with the Substrate

Material enzyme is going to do work on

The biomolecule enzymes are made of

Less, work is done faster (More Helpers)

• A protein that Speeds Up Chemical Reactions

• The Place where the Enzyme matches with the Substrate

• Material enzyme is going to do work on

• The biomolecule enzymes are made of

• Less, work is done faster (More Helpers)

Labelling

Label the parts of the enzyme model

Drag labels to their correct position on the image

Active site

Substrate

Enzyme

Products

Labelling

Label the enzyme diagram

Drag labels to their correct position on the image

Enzyme

Active site

Substrate

Product

Multiple Choice

Which category of macromolecules do enzymes belong to?

• Carbohydrates

• Proteins

• Fats/Lipids

Multiple Choice

Enzymes are specific. This means that an enzyme only works with molecules that are....

• the right size and shape

• broken down already

• present in water

• too big for the body to handle

Multiple Choice

An enzyme speeds up a reaction by

• raising the activation energy

• lowering the activation energy

• releasing energy

• absorbing energy.

Multiple Choice

What happens to an enzyme when it is denatured?

• Activation energy is lowered

• It becomes stronger

• It loses its shape

• Activation energy is raised

Multiple Choice

A substance that is formed as the result of a chemical reaction is a __________________

• Product

• Reactant

• Starters

• Enders

Multiple Choice

What is the BEST definition of a chemical reaction?

• A change in matter that produces one or more NEW substances

• When two things combine and EXPLODE.

Multiple Choice

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Multiple Choice

How many Al atoms are in this compound?         4Al₂O₃

• 2
• 8
• 6
• 4

Multiple Choice

How many F atoms are in this compound?
6MgF₂ 

• 2
• 6
• 8
• 12

Multiple Choice

Look at the chemical equation.

Is it written correctly to show the Law of Conservation of Mass?

• Yes

• No

Multiple Choice

The left side of the equation below is called

• Products
• Reactants