CIE Chemistry (US-0439): Specimen Questions with Answers 21 - 23 of 240

Question number: 21

Short Answer Question▾

Write in Short

  1. Iron from the blast furnace is impure. It contains 5 % of impurities, mainly carbon, sulfur, silicon and phosphorus. Almost all of this impure iron is converted into the alloy, mild steel.

    1. (i) State a use of mild steel.

[1 Marks]

Mild Steel is used for making pipe lines.

Images of mild steel uses

Images of Mild Steel Uses

Images of mild steel uses

Name and give a use of another iron-containing alloy.

name.

Explanation

Ferronickel is the alloy of iron and nickel

Question number: 22

MCQ▾

Question

Which element is a metal?

Choices

Choice (4) Response

a.

Image for element of Metal: Choice A

Image for Element of Metal: Choice A

Image for element of Metal

b.

Image for element of Metal: Choice B

Image for Element of Metal: Choice B

Image for element of Metal

c.

Image for element of Metal: Choice C

Image for Element of Metal: Choice C

Image for element of Metal

d.

Image for element of Metal: Choice D

Image for Element of Metal: Choice D

Image for element of Metal

Answer

b.

Explanation

Correct option is B i. e. charge on element ion is + ve and electrical conductivity is high because metal always donate the electron so charge comes on that and it has free electrons so it is also a good conductor of heat and electricity.

Question number: 23

Short Answer Question▾

Write in Short

Substances can be classified as:

Elements can be divided into:

Define each of the following terms:

Element (2 marks)

Explanation

Each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i. e. the number of protons in the nuclei of its atoms.