1-2: Classification of Matter

Question 1

Atom

Answer 1

The smallest part of matter that has the characteristics of an element. Atoms are made up of subatomic particles called protons, neutrons, and electrons.

Question 2

Element

Answer 2

A pure substance made up of only one type of atom.

Question 3

Monatomic element

Answer 3

Elements that are stable as single atoms

Question 4

Diatomic elements

Answer 4

Elements that, in nature, are found bonded together

Question 5

Molecule

Answer 5

A substance made up of two or more atoms that are chemically joined together. Can be made up of atoms from the same element or from different elements.

Question 6

Compound

Answer 6

A substance made up of two or more different elements that are chemically joined together in a fixed proportion. Separating the elements in a compound requires a chemical reaction.

Question 7

Pure Substance

Answer 7

A single kind of matter that cannot be separated into other kinds of matter by any physical means

Question 8

Mixtures

Answer 8

A substance made up of two or more different elements that are physically joined together in a variable proportion. Separating the elements in a mixture does not require a chemical reaction; physical means are used

Question 9

Homogenous Mixture

Answer 9

A mixture with the same composition throughout

Question 10

Heterogenous Mixture

Answer 10

A mixture with a variable composition

Question 11

Substance

Answer 11

A piece of matter with the same composition throughout