What happens to the atoms of a substance in a physical change?

• Atoms get bigger

• Atoms change their arrangement and motion

• Atoms get smaller

• Atoms bond together differently

What happens to the atoms of a substance in a chemical change?

• Atoms get bigger

• Atoms change their arrangement and motion

• Atoms get smaller

• Atoms bond together differently

Which of these observations would likely be an indication of a chemical change?

• A change in odor when two substances are mixed

• A change in temperature when a hot substance is left standing in air

• A change in volume as a substance is heated

• The disappearance of a liquid as it boils

You mixed two liquids and a precipitate formed, what kind of change occured?

• Physical

• Chemical

What happens when sugar dissolves in water?

• Physical change because a new substance is formed

• Chemical change because a new substance is formed

• Physical change because the sugar is just getting smaller

• Chemical change because the sugar is just getting smaller

At higher temperatures...

• particles in an object have less energy

• particles in an object move faster

• a gas contracts

Melting is a type of ...

• Physical change

• Chemical change

Examples of physical change include

• melting, evaporating, condensing & freezing
• melting, burning & fire
• melting, freezing & burning
• melting, rusting & freezing

What type of matter occurs from 2 or more substances chemically combining?

• element

• compound

• mixture

• property

Why do solids have definite shapes and are incompressible?

• The particles are not rigidly held in place and can move past each other

• The particles are tightly packed with little empty space

• The particles are far apart with lots of empty space

• The particles are tightly packed with lots of empty space