IGCSE Chemistry: Specimen Questions with Answers 53 - 54 of 240

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Question 53

Question

MCQ▾

Which of the following hydrocarbon is an alkane?

Choices

Choice (4)

a.

b.

c.

d.

Answer

a.

Explanation

  • Alkanes are the simplest and least reactive hydrocarbon species containing only carbons and hydrogens
  • Alkane consists of hydrogen and carbon atoms arranged in a structure in which all the carbon-carbon bonds are single
  • Alkanes have the general chemical formula
  • The members of the series (in terms of number of carbon atoms) are named as follows:
  1. methane, CH4 – one carbon and four hydrogen
  2. ethane, C2H6 – two carbon and six hydrogen
  3. propane, C3H8 – three carbon and 8 hydrogen
  4. butane, C4H10 – four carbon and 10 hydrogen
  5. pentane, C5H12 – five carbon and 12 hydrogen
  6. hexane, C6H14 – six carbon and 14 hydrogen

Question 54

Write in Short

Short Answer▾

The table shows some physical properties of the Group VII elements.

Some Physical Properties of the Group VII Elements

Use the information in the table to explain why

chlorine is a gas at room temperature, …

Explanation

In there are covalent bonds between the atoms forming simple molecules. There are weak attractions between molecules of meaning little energy is needed to break these forces of attraction and therefore has a low boiling point. So the Force of attraction between them is very weak due to this it is gas.

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