IGCSE Chemistry: Specimen Questions with Answers 131 - 134 of 240

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Question 131

Write in Short

Short Answer▾

State the name given to a chemical reaction which releases energy.

Explanation

as complete combustion of fossil fuel named as octane.

Question 132

Write in Short

Short Answer▾

Aluminum and gallium are in Group III of the Periodic Table.

When it is a gas, gallium(III) chloride has the structure shown below.
Gas, Gallium (III) Chloride Structure

Write the molecular formula for gallium (III) chloride.

… (1)

Explanation

Gallium chloride molecular if GaCl3 and its reaction is given below. It can also prepared by

Question 133

Write in Short

Short Answer▾

Substances can be classified as:

Elements can be divided into:

Define each of the following terms:

Mixture (1 Marks)

Explanation

A Mixture is a consist of two or more different elements and/or compounds - physically intermingled

Question 134

Question

MCQ▾

Ant stings hurt because of the methanoic acid produced by the ant.

Which substance could, most safely, be used to neutralize the acid?

Choices

Choice (4)

a.

Substance of Choice A

b.

Substance: Choice B

c.

Substance: Choice C

d.

Substance: Choice D

Answer

d.

Explanation

Correct Option is D i.e.. oven cleaner of pH because methanoic acid (formic acid) because mothanoic acid can only neutralize by substance which have . Baking soda is not correct because it can not completely neutralize it completely.

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