IGCSE Chemistry: Specimen Questions with Answers 67 - 69 of 240

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Question 67

Write in Short

Short Answer▾

Alkenes and simpler alkanes are made from long-chain alkanes by cracking. Complete the following equation for the cracking of the alkane .

Explanation

Question 68

Question

MCQ▾

Organic compounds may have names ending in -ane, -ene, -ol or -oic acid.

How many of these endings indicate the compounds contain double bonds in their molecules?

Choices

Choice (4)

a.

1

b.

2

c.

3

d.

4

Answer

a.

Explanation

Correct option is A i.e.. 1 because only – ene represents double bond and – ane represents single bond and – ol or – oic acid is the functional group.

Question 69

Question

MCQ▾

Which substance does not require oxygen in order to produce energy?

Choices

Choice (4)

a.

Coal

b.

Hydrogen

c.

Natural gas

d.

Answer

d.

Explanation

Correct option is D i.e.. because uranium do not require oxygen to produce energy in a nuclear reactor the uranium fuel is assembled in such a way that a controlled fission chain reaction can be achieved. The heat created by splitting the atoms is then used to make steam which spins a turbine to drive a generator, producing electricity. And when we try to produce energy from coal, hydrogen, and natural gas it require oxygen.

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