Moles and Equations

Question 1

Mole

Answer 1

The amount of any substance containing as many particles as there are carbon atoms in exactly 12g of Carbon 12

Question 2

Amount of substance

Answer 2

The quantity whose unit is the mole

Question 3

Avogadro’s constant

Answer 3

The number of atoms per mole of the carbon-12 isotope

Question 4

Molar mass

Answer 4

The mass per mole of a substance

Question 5

Empirical formula

Answer 5

The simplest whole number ratio of atoms of each element in a compound
Inapplicable to giant compounds

Question 6

Molecular formula

Answer 6

The actual number of atoms of each element in a molecule

Question 7

Molecule

Answer 7

A small group of atoms held together by covalent bonds

Question 8

Molar volume

Answer 8

The volume per mole of gas

*one mole of any substance occupies 24dm^3

Question 9

Anhydrous

Answer 9

A molecule that contains no water molecules

Question 10

Hydrated

Answer 10

A molecule that contains water molecules

Question 11

Water of crystallization

Answer 11

Water molecules that form an essential part of the crystalline structure of a compound

Question 12

Process of carrying out a titration

Answer 12

• Using a pipette, add a measured volume of one solution to a conical flask
• The other solution is put in a burette
• A indicator is added to show when the neutralization is complete
• Add the solution in the burette drop by drop until the indicator changes colour

Question 13

Methyl orange

Answer 13

Colour in acid: red
Colour in base: yellow
Colour at the end of titration: orange

Question 14

Bromothymol blue

Answer 14

Colour in acid: yellow
Colour in base: blue
Colour at the end of titration: green

Question 15

Phenolphthalein

Answer 15

Colour in acid: colourless
Colour in base: pink
Colour at the end of titration: pale pink

Question 16

Examples of acids

Answer 16

Sulfuric acid
Hydrochloric acid
Nitric acid

Question 17

Examples of bases

Answer 17

Metal oxides and hydroxides

Ammonia

Question 18

Examples of alkalis

Answer 18

Sodium hydroxide
Potassium hydroxide
Ammonia

Question 19

Amphoteric

Answer 19

Has both acidic and basic properties e.g. amino acids have an amino group and a carboxyl group

Question 20

Solute

Answer 20

The solid that goes into a solution

Question 21

Solvent

Answer 21

The liquid that makes up the solution

Question 22

Solution

Answer 22

The mixture of a solute and a solvent

Question 23

Standard solution

Answer 23

A solution of known concentration

Question 24

Species

Answer 24

Any type of particle that takes place in a chemical reaction

Question 25

Stoichiometry

Answer 25

The molar relationship between the relative quantities of substances taking part in a reaction