Physical & Chemical Changes

According to the information in the passages, what types of changes made to matter is permanent?

• physical changes

• chemical changes

• liquid changes

• scientific changes

Using information from both passages, which of the following examples describes a chemical change to wood? (Look at the "Chemical Clues" chart)

• chopping wood into smaller logs

• planting new trees

• burning wood in a fire place

• a bird using twigs to build a nest in a tree

How are physical changes and chemical changes ALIKE?

• both changes are irreversible

• both changes can be undone

• both changes are only performed by scientists

• both changes happen to things made of matter

Using the information in the table, what is a clue that helps people know biscuit dough goes through a chemical change?

• the color changes

• there is light created

• the dough produces heat

• the dough stays the same

According to information in "Physical Changes" what is matter made of?

• different chemical and colors

• tiny particles called atoms

• heat and odor

• water and soil

When water goes through a physical change and turns into gas, what is another term used to describe the water when it is a gas?

• water vapor

• solid

• gasoline

• liquid

Why is butter melting a physical change?

• it never melted

• butter is still butter (even after it melts)

• it is not a physical change

• it changes into a gas

According to the text "Chemical Changes" what causes rust and a change in color on iron?

• Rust is caused when two objects are rubbed together very quickly.

• Rust is caused when the iron turns sour and begins to smell.

• Rust is caused when iron reacts with water and oxygen.

• Rust is caused when iron reacts with smoke and heat.