Quantitative Chemistry

Question 1

Atomic number:

Answer 1

The number of protons in the nucleus of an atom.

Question 2

Mass number:

Answer 2

The number of protons and neutrons in the nucleus of an atom.

Question 3

Isotopes:

Answer 3

Atoms of the same element with different numbers of neutrons in the nucleus of an atom.

Question 4

Relative atomic mass:

Answer 4

The average mass based on the percentage abundance of each isotope as they occur in nature.

Question 5

Mole:

Answer 5

The amount of substance expressed in grams which contains as many elementary particles as there is in 12 g of carbon-12 isotope.

Question 6

Molar mass

Answer 6

The mass in grams in one mole of that substance

Question 7

Molar volume

Answer 7

The volume occupied by 1 mole of any gas at standard temperatue and pressure.

Question 8

Solute

Answer 8

The substance that is dissolved in the solvent to form a solution

Question 9

Solvent:

Answer 9

The substance in which the solute is dissolved in forming a solution.

Question 10

Aqueous solution

Answer 10

When the solvent is water

Question 11

Dissociation:

Answer 11

When the cations and anions are removed from the ionic lattice when a solid dissolves in water to form an aqueous solution

Question 12

Ionisation

Answer 12

When a covalent compound dissolves in water, the covalent molecules break up to for ions in the solution.

Question 13

Gaseous solutions

Answer 13

When the gases occupy the entire volume of the container.

Question 14

Concentration

Answer 14

The number of moles of solute per unit volume of solution

Question 15

Standard solution

Answer 15

A solution of known concentration

Question 16

Theoretical yeild:

Answer 16

Refers to the maximum amount of product which can be produced based in a chemical reaction

Question 17

Actual yeild:

Answer 17

Refers to the the actual amount of product which can be produced based in a chemical reaction

Question 18

Percentage yeild:

Answer 18

The percentage of the yield which actually occurred out of the theoretical yield.

Question 19

Diatomic molecules:

Answer 19

Molecules which contain two atoms which are covalently bonded togeather