IGCSE Chemistry: Specimen Questions with Answers 89 - 93 of 240

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Question 89

Question

MCQ▾

Number of valence electrons in group is ________.

Choices

Choice (4)

a.

1

b.

2

c.

3

d.

4

Answer

c.

Explanation

Correct option is C because number of valence electron is equal to the group number.

Question 90

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Write in Short

Short Answer▾

Classify each of the following as either an element, compound or mixture

Brass (1 Marks)

Explanation

Brass is a mixture of the elements of copper and zinc. Bronze is a mixture of copper and tin. Water is a compound of the elements hydrogen and oxygen.

Question 91

Question

MCQ▾

Bases are ________ in nature.

Choices

Choice (4)

a.

rigid

b.

rough

c.

slippery

d.

elastic

Answer

c.

Explanation

Bases are “slippery” in nature. When you rub soap in your hand, your hands turn slippery. This is because soaps comprises of bases.

Question 92

Write in Short

Short Answer▾

Describe a test, other than measuring pH, which can be carried out on both acid solutions to confirm the explanation given in (b)(i) for the different pH values of the two acids.

Complete the following equations for reactions of these two acids.

Explanation

Question 93

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Write in Short

Short Answer▾

carbon dioxide

Explanation

A compound made up of molecules containing one carbon atom and two oxygen atoms is an carbon di oxide. Carbon dioxide is normally found as a gas that is breathed out by animals and absorbed by green plants.

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