Defenitions

Question 1

Relative atomic mass

Answer 1

The mean mass of one atom of an element compared to 1/12 the mass of an atom of 12C

Question 2

Relative molecular mass

Answer 2

The sum of the mean masses of atoms in formula compared to 1/12 the mass of an atom of 12C

Question 3

Empirical formula

Answer 3

Simplest ratio of atoms of each element

Question 4

Molecular formula

Answer 4

Actual number of atoms of each element in a compound

Question 5

Avogadros constant

Answer 5

The number of particles that is equal to the number of atoms in 12g of 12C (1 mole of 12C)

Question 6

Mole

Answer 6

Mass of substance containing the same number of particles as there are atoms in 12g of 12C

Question 7

Atom economy

Answer 7

The measure of the amount of starting reactants that end up as useful products

Question 8

Percentage yield

Answer 8

The ratio of actual yield of product compared to theoretical yield

Question 9

Limiting reactant

Answer 9

React that is completely used up and therefore limits the amount of product formed

Question 10

Phenolphtolein

Answer 10

Alkali - pink
Acid - colourless

Question 11

Methyl orange

Answer 11

acid - red
neutral - orange
alkali - yellow