@CaCO  CaO + CO What mass of CaCO must be heated to produce 560g of CaO?
1000g
680g
100g

@The emperical formula of a compound is CH. What else needs to be known to find its molecular formula?
Relative molecular mass
Percentage compostion of the compound
The volume occupied by 1 mole of the compound at room temperature

@What is the mass of two moles of nitric acid (HNO)?
63g
31g
91g

@A volume of ethane (CH) has a mass of 30g. What is the mass of an equal volume of propene (CH) at the same temperature
42g
28g
20g

@Which one of the following is the molecular formula of a hydrocarbon which contains less than 80% by mass of carbon?
CH
CH
CH

@The Avagadro constant is the number of:
Atoms in 40g of potassium
Atoms in 2g of helium
Molecules in 16g of oxygen

@50cm of CO was burnt in 50cm of O. What is the composition of the gas after the reaction?
50cm of CO and 25cm of O
50cm of CO only
100cm of CO

@What is the mass of each element present in one mole of calcium chloride (CaCl)
Calcium, 40g and Chlorine, 71g
Calcium, 20g and Chlorine, 35.5g
Calcium, 80g and Chlorine, 35.5g

@Which one of the following would occupy the smallest volume at room temperature and pressure?
16g of chlorine gas
16g of methane
16g of carbon dioxide

@What is the mass of three moles of sulphuric acid (HSO)?
294g
98g
50g

@What is the relative molecular mass of water (HO)?
18
16
20

@What is the relative molecular mass of iron II sulphide?
88
56
32

@What is the relative molecular mass of chlorine gas?
71.0
35.5
72.0

@The relative molecular mass of aluminium sulphate Al(SO)?
342
192
248

@The relative molecular mass of ammonium chloride NHCl?
53.5
50.5
60.0

@The relative molecular mass of NaCl is:
58.5
117.0
57.5

@The relative molecular mass of NaNO is:
85
53
71

@What is the relative molecular mass of lead nitrate Pb(NO)?
331
314
269

@The relative molecular mass of CHOH is:
46
45
62

@The relative molecular mass of CuSO.5HO is:
249.5
159.5
177.5

@Zn + ?HCl  ZnCl + H What is the missing number needed to balance this equation?
2
1
3

@AlCl + ?NaOH  Al(OH) + 3NaCl What is the missing number needed to balance the equation?
3
1
2

@2Fe + 3Cl  ?FeCl The number needed to balance the equation is:
2
1
3

@?NH + 3CuO  3HO + 3Cu + N The number needed to balance the equation is:
2
1
3

@2Mg + ?CO  2MgO + C The number needed to balance the equation is:
1
2
3

@NaCl + HSO  ?NaHSO + HCl The number needed to balance the equation is:
1
2
4

@CHO  ?CHOH + 2CO The number needed to balance the equation is:
2
1
3

@?HO  2HO + O The number needed to balance the equation is:
2
1
4

@Cl + ?NaOH  NaCl + NaOCl + HO The missing number to balance the equation is:                                                            
2
1
4