Physical Science Chapter 21

Macroscopic

can be seen

Microscopic

can only been seen with a microscope

Chemical and physical changes are similar in that they both involve

changes in physical appearance

Leaves produce oxygen

chemical

sick person develops fever

chemical

tropical coral reef dies

chemical

When atoms of different elements bond together they form a

compound

Compared to chemical changes, physical changes typically involve

less energy and reversibility

Chemistry is the study of

matter

a computer is turned on

physical

Matter in gaseous phase occupies much more _____ than solids and liquids.

volume

What is the difference between an element and a chemical compound?

An element consists of only one type of atom

How is a physical change different from a chemical change?

The chemical identity of a substance is not altered during a physical change.

When two different elements combine to form a compound, the resulting properties of the compound are

not necessarily anything like those of the elements

To say a chemical equation is balanced means the

number of atoms for each element of reactant is equal to the number of atoms for each element as a product.

A cloud grows dark (physical or chemical)

physical

food coloring is added to water

physical

Submicroscopic

realm of atoms and molecules, too small to be seen with a microscope

During a chemical reaction old atoms

stick around switching partners