Physical and chemical changes

What is a liquid?

Select 2 features.

• Particles are close together

• Particles can slide past each other

• Particles cannot move

• Particles are in a regular arrangement

What is a gas?

Select 2 features

• Particles can vibrate

• Particles are in an irregular arrangement

• Particles are very close together

• Particles are far apart from each other.

Select two examples of a physical change

• Ice melting

• A match burning

• Iron rusting

• Tearing up paper

Select two examples of a chemical change

• A burger being cooked

• ice melting

• A match burned

• breaking glass

Select two features of a chemical change

• A chemical change is hard to reverse

• A chemical change is easy to reverse.

• A chemical change creates a new material

• A chemical change does not create a new material

True or false?

A physical change does not create a new material

• True

• False

How do we know when a substance is more reactive?

Select two

• More heat is produced

• More bubbles of gas are produced more quickly

• Less heat is produced

• Less bubbles are produced and they appear more slowly

What is an independent variable?

• The thing you observe

• The thing we change

• The thing we keep the same

What are control variables?

• The thing you observe

• The thing you change

• The things you keep the same to make sure it is a fair test

What is a solid?

Select 2 features

• Particles are moving constantly in all directions

• Particles are very close together

• Particles cannot move but can vibrate

• Particles are far apart