1. Define the following terms
a) Unified atomic mass
b) Relative atomic mass
c) Relative isotopic mass
d) Relative molecular mass
e) Relative formula mass
Mole
2. Write the formulae of the following compounds giving the constituent
anions and cations
Compound Name
Formula
Cation
Anion
lithium fluoride
sodium chloride
calcium chloride
iron(II) oxide
aluminum sulfide
iron(III) sulfate
Ammonium nitrate
Lead II carbonate
Ammonium carbonate
Iron III chloride
3. a) Distinguish between empirical formula and molecular formula
a) 15g of sodium reacted with 0.8g of sulphur. Calculate the empirical
formula of sodium sulphide.
b) 1.35g of aluminium was heated in oxygen until there was no further
gain in weight. The white oxide ash formed weighed 2.55g. Deduce
the empirical formula of aluminium oxide.
4. write the ionic equations of the following equations
a. HNO3(aq) + NaOH(aq) → NaNO3(aq) + H2O(l)
b. HCl(aq) + KOH(aq) → KCl(aq) + H2O(l)
c. H2SO4(aq) + Mg(OH)2(aq) →MgSO4(aq) + 2H2O(l)
d. NH4OH(aq) + HCl(aq) → NH4Cl(aq) + H2O(l)
e. H2CO3(aq) + 2NH3(aq) → (NH4)2CO3(aq)
f. Pb(NO3)2(aq) + 2LiCl(aq) → PbCl2(s) + 2LiNO3(aq)
g. Ba(NO3)2(aq) + MgSO4(aq) → BaSO4(s) + Mg(NO3)2(aq)
h. AgNO3(aq) + NaBr(aq) → AgBr(s) + NaNO3(aq)
i. 2AgNO3(aq) + MgI2(aq) → 2AgI(s) + Mg(NO3)2(aq)
j. CuSO4(aq) + 2NaOH(aq) → Cu(OH)2(s) + Na2SO4(aq)
END
REFERENCES
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