Definitions

Question 1

Isotopes

Answer 1

Atoms with the same number of protons but a different number of neutrons.

Question 2

Relative isotopic mass

Answer 2

The mass of an isotope relative to 1/12th of the mass of an atom of carbon-12.

Question 3

Relative atomic mass

Answer 3

The weighed mean mass of an atom relative to the mass of an atom of carbon-12.

Question 4

Acids

Answer 4

Proton donors

Question 5

Bases

Answer 5

Proton acceptors

Question 6

Alkalis

Answer 6

Soluble bases that release `OH ions

Question 7

A salt

Answer 7

A chemical compound formed from an acid, when an H+ ion from the acid has been replaced by a metal ion or another positive ion, such as the ammonium ion, NH^4.

Question 8

Relative atomic mass (Ar)

Answer 8

Average mass of one atom of an element
÷
1/12th the mass of a C-12 atom

Question 9

Relative Molecular Mass (Mr)

Answer 9

Average mass of one molecule
÷
1/12th the mass of a C-12 atom

Question 10

Avogadro constant

Answer 10

The number of atoms in 12g of C-12.

6.022 x 10^23

Question 11

Empirical Formula of a compound

Answer 11

The simplest whole number ratio of atoms of each element.

Question 12

Molecular formula of a compound

Answer 12

The actual number of atoms of each element.