2.1.1

Question 1

define Relative Atomic Mass (Ar)

Answer 1

the weighted mean mass of an atom of an element, compared to 1/12th of the mass of an atom of carbon-12

Question 2

define relative isotopic mass

Answer 2

the mass of an isotope

Question 3

define empirical formula

Answer 3

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

Question 4

molecular formula

Answer 4

the number and type of atoms of each element in a molecule. it is the true number of each atom in the molecule

Question 5

water of crystallisation

Answer 5

water apart of the crystalline structure

Question 6

concentration units

Answer 6

g dm-3, mol dm-3

Question 7

what is a standard solution?

Answer 7

a solution of a known concentration - can be prepared by dissolving a known mass of solid in solvent and making it up to an exact volume

Question 8

limiting reagent

Answer 8

reactant that is not in excess

Question 9

what is the ideal gas constant R?

Answer 9

8.31

Question 10

how do you convert from degrees celsius to kelvin

Answer 10

+273