IGCSE Chemistry: Specimen Questions with Answers 6 - 8 of 240

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Question 6

Write in Short

Short Answer▾

Substances can be classified as:

Elements can be divided into:

Define each of the following terms:

Compound (2 Marks)

Explanation

A compound is a substance that results from a combination of two or more different chemical element՚s, in such a way that the atom s of the different elements are held together by chemical bonds that are difficult to break.

Question 7

Question

MCQ▾

The diagram shows an incomplete circuit.

Incomplete Circuit

Which substance causes the lamp to light when added to the glass tube?

Choices

Choice (4)

a.

Aqueous sodium chloride

b.

Aqueous sugar

c.

Solid sodium chloride

d.

Solid sugar

Answer

a.

Explanation

Correct Option is A means aqueous sodium chloride because when sodium chloride will be in solid form then it is a non – conductive and when it dissolve in water then it form ions. Sugar is non – electrolyte so it do not conduct electricity in aqueous form as well as solid form. As shown in figure that ions carry charge.

Aqueous Sodium Chloride Electrical Conductivity
Electrical Cable

Question 8

Write in Short

Short Answer▾

The structures of five atoms, A, B, C, D, and E, are shown below.

The Structures of Five Atoms

The structure of carbon can be written . Write the structure of atom D in a similar way.

Explanation

Correct Answer is because in carbon represent the mass number and C represent the atom of carbon similarly here A is the mass no. and D is the Atom. As shown in the figure given below:

Carbon-1212

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