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Keywords: Relative Atomic Mass, Relative Formula Mass, Moles, Empirical Formula, Percentage Mass
Element Ar Element Ar Element Ar BALANCING EQUATIONS
aluminium Al 27 hydrogen H 1 phosphorus P 31 a) ....Mg + ....CO2 ....MgO + ....C
bromine Br 80 iodine I 127 potassium K 39 b) ....Fe + ....Cl2 ....FeCl3
calcium Ca 40 iron Fe 56 silver Ag 108 c) ....N2 + ....H2 ....NH3
carbon C 12 magnesium Mg 24 sodium Na 23 d) ....Al + ....O2 ....Al2O3
chlorine Cl 35.5 manganese Mn 55 sulfur S 32 e) ....NH3 + ....CuO ....Cu + ....N2 + ....H2O
copper Cu 63.5 nitrogen N 14 tin Sn 118.7
fluorine F 19 oxygen O 16 zinc Zn 65 NEUTRALISATION ­ Name the acid and write the salt formula
Cover up the unknown variable
a) HCl + NaOH ______ + H2O
in your triangle to discover the b) H2SO4 + 2 NH4OH ________ + 2 H2O
formula needed to work it out. E.
g., if you need to work out moles; c) Na2CO3 + 2 HNO3 ________ + H2O + CO2
moles = mass ÷ Mr
d) Ca(OH)2 + H2SO4 ________ + 2 H2O
CALCULATE THE RELATIVE FORMULA MASS (Mr) using the above table :
a) CaCl2 f) KCl BORN-HABER PROCESS
b) CO2 g) KOH N2 + 3H2 2NH3
c) MgSO4 h) CaCO3 a) What is a reversible reaction? What symbol represents this reaction?
d) MgO i) KClO3 b) What is the Born-Haber process used to make?
e) Al2O3 j) HO c) What are the optimum conditions for this process?
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d) What catalyst is used in this process?
CALCULATING THE NUMBER OF MOLES or THE MASS OF A COMPOUND e) Explain how temperature affects the position of equilibrium.
f) Explain how pressure affects the position of equilibrium
In each case calculate the number of In each case calculate the mass in grams of
moles of material in the given mass. material in the given number of moles. g) Give a major use of the product (s).
a) 9.00 g of H2O a) 2 moles of H2O h) Give one major environmental drawback of this use.
b) 88.0 g of CO2 b) 3 moles of CO2
c) 1.70 g of NH3 c) 2.8 moles of NH3
d) 230 g of C2H5OH d) 0.50 moles of C2H5OH
e) 560 g of C2H4 e) 1.2 moles of C2H4
CALCULATING EMPIRICAL FORMULAE (use Ar from the top table)
a) Find the empirical formula for a compound consisting of 63% Mn and 37% O
b) Vitamin C contains three elements: carbon, hydrogen, and oxygen. Analysis of
200g of pure vitamin C indicates that the elements are present in the following
masses:
C = 81.8g, H = 9.2g, O = 109g
c) The mineral Cassiterite is a compound of tin and oxygen. Chemical analysis of
Cassiterite shows that the mass percentages of tin and oxygen are 78.8%
and 21.2%, respectively. Determine the formula of this compound.
Keywords: Reaction, Ph, Acid, Alkali, Salt, Precipitate Exothermic, Endothermic, Temperature, Concentration, Surface Area, Catalyst…read more

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