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Form 4 Paper 2 Term 1 2021 Chemistry Exam Set 36 [PDF]

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Question 1

The grid below represents part of the periodic table. Study it and answer the questions that follow. The letters do not represent the actual symbols of the elements.

    1. Which letter represents an element that is least reactive
    2. Why are elements D and E referred to as alkaline earth metals
  2. How does the atomic radius of F and H compare?
  3. Select two letters representing a pair of elements that would react most explosively.
  4. Write an equation showing how element D forms its ions
  5. Write the formulae of :
    1. Bromide of D
    2. Sulphate of C
  6. What type of bonding exist between
    1. E and J
    2. G and J
  7. Explain why the melting point of J is higher than that of I
  8. When 1.15g of C were reacted with water, 600cm3 of gas was produced. Determine the reactive atomic mass of C. (Molar gas volume = 24 000cm3)
Answer
    1. K
    2. Because elements D and E are found in group II of the periodic table are found widely in the earth's crust.
  2. F has a larger atomic radius than H because across the periodic there is increase of effective nuclear charge due to increase in the number of protons.
  3. Elements C and I
  4. D(g) → D2+(g) + 2e-
    1. Bromide of D - DBr2
    2. Sulphate of C - C2SO4
    1. E and J - Ionic bond
    2. G and J - Covalent bond
  7. The M.P of J is higher than that of I because as you move down the group the molecular mass increases with the size hence the bigger the molecule the higher the number of Van der wall forces.

Question 2

The flow chart below outlines the manufacture of several important fertilizer. Use it to answer the questions that follow:

    1. Identify substance A,B,C,D,E and F
      • A
      • B
      • C
      • D
      • E
      • F
    2. From which industrial process can sulphur be obtained?
    3. State the condition necessary for conversion of sulphur (IV) oxide to sulphur (VI) oxide in the contact process.
    4. State one source of hydrogen used in the haber process.

      1. Name substances X and Y
      2. Give one source of substance X used in the process above
      3. What is the purpose of substance Y in the process above?
      4. Write an equation from the reaction producing hydrogen chloride gas in the above process.
Answer
      • A - Ammonia
      • B - Ammonium sulphate
      • C - Ammonium Nitrare
      • D - Calcium nitrare
      • E - Nitric (v) oxide
      • F - Sulfur trioxide
    2. Sulfur can be obtained as a byproduct in the copper refining process or through the distillation of natural gas.
    3. Presence of a catalyst(Vanadium (v) Oxide)
      Temperature: Approximately 450°C to 500°C
      About 1 to 2 atmospheres
    4. Natural gas, which is primarily Methane.
      1. X - Hydrogen gas
        Y - Glass beads
      2. Hydrogen gas is obtained from electrolysis of acidified water or obtained from cracking of alkanes.
      3. Glass beads increase surface area for the dissolving of hydrogen chloride gas. Glass beads control the absorption of HCl gas so that it can dissolve in water.
      4. Cl2(g) + H2 → 2HCl(g)
Question 3

Give the names of the following compounds.
  1. CH3 CH2 CH2 CH2 OH
  2. CH3COOCH2CH3
Answer
  1. Butan-1-ol
  2. Ethyletharioate
Question 4

One of the two formulae in the above question represents a sweet smelling compound. Give the names of the two organic compounds that can be used to prepare this compound in the laboratory.
Answer
Ethanoic acid and Ethanol.
Question 5

Ethane and Ethene react with Bromine according to the following equations given below:
  1. C2H6(s) + Br2(g) → C2H5Br(l) + HBr(g)
  2. C2H4 + Br2(g) → C2H4Br2(l)
Name the type of bromination reaction taking place in:
Answer
  1. Substitution
  2. Addition
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