Test 1

Question 1

Mixture

Answer 1

When 2 or more substances are combined but not chemically joined

Question 2

Molecule

Answer 2

When 1 or more atoms of the same or different type are chemically bonded together.

Question 3

Atom

Answer 3

The smallest particle of a chemical element that can exist.

Question 4

Particle

Answer 4

A minute portion of matter.

Question 5

Proton

Answer 5

A stable subatomic particle occurring in all atom nuclei with a positive electric charge equal in magnitude to that of an electron.

Question 6

Neutron

Answer 6

A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

Question 7

Electron

Answer 7

A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

Question 8

Chemical reaction

Answer 8

Something that can’t be reversed.

Question 9

Physical change

Answer 9

Something that can be reversed