NS- Definitons

Question 1

Atoms

Answer 1

The smallest building block of all matter. It cannot be broken down further. It contains protons, electron and neutrons.

Question 2

Element

Answer 2

A material that consists of atoms of only one kind.

Question 3

Compound

Answer 3

A material that consists of two or more different element that have been chemically bonded. They can only be broken down by chemical means.

Question 4

Molecule

Answer 4

A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Question 5

Diatomic Molecule

Answer 5

Molecules that are composed of only two atoms of the same kind. They are gases. H, N, O, Br, Fl, Cl and I.

Question 6

Mixture

Answer 6

Two or more substances which have been combined such that each substance retains its own chemical identity. They can be separated by physical means.

Question 7

Pure Substance

Answer 7

Substances that are made of only one type of molecule.

Question 8

Impure Substance

Answer 8

A mixture of two or more kinds of molecules and has no definite composition and properties.