1. (a) Identify the reactants and products of equation (6).
$\ce{Vegetable~Oil~_{(l)} + H_{2~(g)} ->[{60ºC}][{Ni~Catalyst}] Vanaspathi~Ghee_{(s)} }$ ... ... (6)
→ The reactants are Vegetable Oil and Hydrogen while the product is Vanaspathi Ghee.
1 Mark
1. (b) Write down the steps in balancing the equation:
$\ce{N_{2(g)} + H_{2~(g)} \ce{<=>} NH_{3(g)} }$
  1. First, let’s write the equation as shown below:
    N2 + H2 ⟶ NH3
  2. Write the number of atoms in the unbalanced equation:
    Element No. of atoms in reactants No. of atoms in products
    N 2 1
    H 2 3
    Total 4 4
  3. Now, equalise the number of nitrogen atoms of products by using a factor of 2:
    Element No. of atoms in reactants No. of atoms in products
    N 2 1 × 2 = 2
    H 2 3 × 2 = 6
    Total 4 8
  4. Now, the equation becomes:
    N2 + H2 ⟶ 2NH3
  5. Now, equalise the number of hydrogen atoms of reactants by using a factor of 3:
    Element No. of atoms in reactants No. of atoms in products
    N 2 2
    H 2 × 3 = 6 6
    Total 8 8
  6. Now, the equation becomes:
    N2 + 3H2 ⟶ 2NH3
  7. Count the number of atoms of each element on each side. We find that the number of atoms is same on each side. Hence, this is a balanced equation.
  8. Indicate the physical states of reactants and products and write the final balanced equation as:
    $\ce{N_{2(g)} + H_{2~(g)} \ce{<=>} NH_{3(g)} }$
    2 Marks
2. Write down a balanced chemical equation for the following reaction:
Calcium chloride + Sulphuric acid ⟶ Calcium sulphate + Hydrogen chloride
↣ CaCl2 + H2SO4 ⟶ CaSO4 + 2HCl
1 Mark
3a. Write down the physical states of reactants and products in following reactions:
SO2 + 2H2S ⟶ 3S + 2H2O
→ The physical states are as follows:
Substance Physical State
SO2 Gaseous
H2S Gaseous
S Solid
H2O Liquid
2 Marks
3b. Write down the physical states of reactants and products in following reactions:
2Ag + 2HCl ⟶ 2AgCl + H2
→ The physical states are as follows:
Substance Physical State
Ag Solid
HCl Liquid
AgCl Solid
H2 Gaseous
2 Marks
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This page was last modified on
26 August 2019 at 00:58

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