Chemical Reactions

What is a chemical reaction?

• An explosion.

• A process in which new substances are formed.

• When you mix chemicals together.

• A chemical liquid.

What is the difference between a physical and chemical change?

• In physical changes, new substances are formed.

• In chemical changes, substances change their state of matter.

• In chemical changes, new substances are formed.

• There is no difference.

What is an example of a property?

• Baking soda.

• A chemical.

• A molecule.

• Flammability.

What are reactants?

• Substances that undergo a change during a reaction.

• Substances that are the final products of a reaction.

• Substances that are flammable.

• Substances that remain the same during a reaction.

What are products?

• Substances that stay the same during a chemical reaction.

• Substances that undergo a chemical change during a reaction.

• Substances that are formed at the end of a chemical reaction.

• Substances that physically change during a reaction.

How do you know a chemical reaction has happened?

• If a substance stays the same.

• If no new substances have formed.

• If a substance changes its state of matter.

• If a new substance is formed and it has different properties.

What is the difference between an atom and a molecule?

• Atoms are big and molecules are small.

• Atoms are single particles, and molecules are a group of atoms.

• Molecules are single particles, and atoms are a group of molecules.

• Atoms are circle shaped, and molecules are square shaped.

What happens to atoms in a chemical reaction?

• The total number of atoms does not change.

• The total number of atoms increases.

• The total number of atoms decreases.

• The atoms change shape and colour.

What stays the same during a chemical reaction?

• The substances being reacted together.

• The total number of atoms.

• The temperature of the chemical reaction.

• Nothing stays the same.

What is an example of a chemical change?

• Making jelly.

• Baking a cake.

• Mixing cordial.

• Melting ice.