Unit1Topic7 - Quantitative

Question 1

RAM

Answer 1

Relative atomic mass of an atom is the mass of the atom compared with that of the carbon-12 isotope, which has a mass of exactly 12

Question 2

RFM/RMM

Answer 2

Relative formula mass/relative molecular mass can be found by adding together all the atomic masses of all the atoms in the formula of the element or compound

Question 3

Moles

Answer 3

The RFM of a substance in grams is known as one mole of that substance

Question 4

% of an element in a compound

Answer 4

Mass of element in one mole of the compound/ mass of one mole of the compound x 100

Question 5

% yield

Answer 5

Actual mass / theoretical mass x 100

Question 6

Possible reasons why yield is less that 100%

Answer 6

Side reactions

Impossible to separate the product fully out of the reaction mixture

Question 7

Empirical formula

Answer 7

Is the simplest whole number ratio of atoms of each element present in a compound

Question 8

Molecular formula

Answer 8

Shows the actual number of atoms of each element in a molecule

Question 9

Hydrated

Answer 9

Crystalline and containing water molecules

Question 10

Anhydrous

Answer 10

A substance containing no water molecules

Question 11

Water of crystallisation

Answer 11

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

Question 12

How can water of crystallisation be removed?

Answer 12

By heating to a constant mass to ensure all water molecules have been removed