What are the two main types of changes that substances can go through?

• Hot and cold

• Big and small

• Physical and chemical

• Fast and slow

What happens to a substance during a physical change?

• Its chemical bonds break and form new ones.

• Its molecules rearrange to make a new substance.

• Its appearance changes, but its basic makeup stays the same.

• It always turns into a gas.

If you crush graham crackers in your backpack, what kind of change is it?

• Chemical change

• Physical change

• State change

• Molecular change

When a popsicle melts on a hot day, what kind of change is happening?

• Chemical change, because it gets warm.

• Physical change, because it changes from solid to liquid.

• Chemical change, because it tastes different.

• Physical change, because it disappears.

Tearing a piece of paper into smaller pieces is an example of what type of change?

• Chemical change

• Molecular change

• Physical change

• Compositional change

What happens to molecules during a chemical change?

• They stay exactly the same.

• They link up in new ways to form different substances.

• They only change their shape.

• They become invisible.

When you bake a cake, the batter changes into a cake. What kind of change is this?

• Physical change

• State change

• Chemical change

• Appearance change

What can be a sign of a chemical change happening, if it's not from evaporation?

• A change in size

• Bubbles forming

• A change in shape

• The substance getting colder

Which of these can be a sign that a chemical change has happened?

• The object gets bigger.

• The object changes its texture.

• A new smell or taste is created.

• The object is painted a new color.

Which type of change is usually easier to undo or reverse?

• Chemical changes

• Physical changes

• Both are equally easy

• Neither can be reversed