Chemical Calculations

Question 1

Atomic mass symbol

Answer 1

Ar

Question 2

Isotope

Answer 2

An atom with the same amount of protons but a different number of neutrons. Same atomic number but a different mass number.

Question 3

Mole

Answer 3

An amount of substance (6.02 x 10 ^ 13)

Question 4

Molecular mass symbol

Answer 4

Mr

Question 5

Molar mass

Answer 5

The mass of one mole of substance in grams per mole (gmol-1), symbol M

Question 6

Empirical formula

Answer 6

The lowest whole number ration of atoms in a compound

Question 7

Percentage composition

Answer 7

The percentage by mass of an element in a compound

Question 8

Hydrated

Answer 8

With water

Question 9

Atomic mass

Answer 9

The mass of an atom when compared to a C-12 atom

Question 10

Molecular mass

Answer 10

The sum of the atomic masses of the atoms in a compound or molecule

Question 11

Avogadro’s number

Answer 11

6.02 x 10^23 (one mole)

Question 12

Mass units and symbol

Answer 12

Mass - m, grams - g

Question 13

Mole units and symbol

Answer 13

Moles - n, mol

Question 14

Concentration units and symbol

Answer 14

Concentration - C, units gL-1, molL-1

Question 15

Aqueous solution

Answer 15

When water is the solvent

Question 16

Solution

Answer 16

When a solute dissolves into a solvent

Question 17

Solvent

Answer 17

The liquid that dissolves a solute

Question 18

Molecular formula

Answer 18

Total number of atoms in a compound

Question 19

Anhydrated

Answer 19

Without water

Question 20

Number of particles unit and symbol

Answer 20

Unit - particles, symbol - N

Question 21

Solute

Answer 21

The substance that dissolves in a solvent

Question 22

Concentration

Answer 22

How much solute dissolves in a solvent