O Level | IP Chemistry Tuition – Are you able to answer this Secondary Chemistry Tuition Question?

12 May O Level | IP Chemistry Tuition – Are you able to answer this Secondary Chemistry Tuition Question?

3 . Methane, CH4, is the major constituent of natural gas.

(a) Draw a dot-and cross-diagram to show how the outer shell electrons are arranged in

 

Legend
show hydrogen electrons as •show carbon electrons as x

 

(b) At a temperature of –5 °C and a pressure of 26 atmospheres, methane combines with water and forms an ice-like structure called methane hydrate. Large quantities of methane hydrate have been found underground.

(i) Describe the arrangement and motion of the particles in solid methane hydrate.

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(ii) The methane hydrate underground has not yet been extracted in large amounts. When it is extracted, large volumes of methane are released.

Suggest two reasons why methane hydrate decomposes when it is extracted.
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(iii) Describe how the presence of methane in the atmosphere may affect the environment.
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(c) A very small quantity of methane is present in the atmosphere.
State another source of this gas.
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(d) State one use of methane.
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(e) In the presence of light methane reacts with chlorine.

CH4 + Cl2 → CH3Cl + HCl ΔH = –99.5 kJ Draw an energy profile diagram for this reaction.

Show:
• the reactants and products,
• the activation energy,
• the enthalpy change.
chemistry_tuition_q
4. Structures of six organic compounds are shown.

chemistry_tuition_q
(a) Which two compounds have the same molecular formula?
……………………………………………….. and ……………………………………………….

(b) Which compound is butanoic acid?
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(c) Which compound contributes to ozone depletion in the upper atmosphere?
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(d) Name compound B.
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Miracle Learning Centre (O Level Chemistry Tuition/ IP Chemistry Tuition)
Did you answer the Secondary Chemistry Tuition Question correctly?

3.a. Covalent bond, 1 C, 4 H
Correct diagrams
Correct electrons
Correct legend

b.i.
Arrangement Motion
• Fix position / regular
• Closely packed • Vibrate

ii. Increase in temp + increase in pressure.
iii. Increase in Global Warming issue.
c. From cow dung / decomposition of plants / any other possible sources
d. CNG for car, fuel, cooking gas
e.
chemistry_tuition_q
4.a. A & B
b. D
c. E
d. butene

Learn from our Chemistry Tuition Question and Answer.
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(Specialist in Science and Maths) for Primary, Secondary and JC levels.
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