IGCSE Chemistry: Specimen Questions with Answers 16 - 18 of 240

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Question 16

Write in Short

Short Answer▾

Aluminum is used to make high voltage electricity cables.

Details of Four Metals

The table shows some properties of four metals which could be used for overhead power cables.

Overhead Power Cables
Give two reasons why aluminum is used for overhead power cables rather than copper.

Explanation

  1. Aluminum is used for overhead power cables rather than copper because aluminum has less electrical conductivity.
  2. Aluminum is used for overhead power cables rather than copper because Aluminum has less melting point.

Question 17

Question

MCQ▾

The vertical columns in a periodic table are called ________.

Choices

Choice (4)

a.

Rows

b.

Group

c.

All of the above

d.

Question does not provide sufficient data or is vague

Answer

b.

Explanation

Correct option is B because the vertical columns in a periodic table are called group.

In the periodic table of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families.

Vertical Columns of Elements

Question 18

Question

MCQ▾

Hydrocarbons are essentially made of ________.

Choices

Choice (4)

a.

Hydrogen and Cadmium

b.

Hydrogen and Calcium

c.

Hydrogen and Carbon

d.

Question does not provide sufficient data or is vague

Answer

c.

Explanation

Hydrocarbons are essentially made of hydrogen and carbon.

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