IGCSE Chemistry: Specimen Questions with Answers 229 - 232 of 240

Question number: 229

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MCQ▾

Question

When a Chalk piece is added to Vinegar, it ________.

Choices

Choice (4) Response

a.

Remains the same

b.

Changes its colour to blue.

c.

Disintegrates

d.

Dissolves to from a solution

Answer

c.

Explanation

When a Chalk (calcium carbonate) piece is added to Vinegar (acetic acid), it disintegrates.

Question number: 230

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Short Answer Question▾

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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 number: 231

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The table shows some physical properties of the Group VII elements.

some physical properties of the Group VII elements

Some Physical Properties of the Group VII Elements

some physical properties of the Group VII elements

Suggest a value for the atomic radius of fluorine.

………………………………………………………………………………………………………….

Explanation

Atomic radius of fluorine is because it has electronegativity about .

Question number: 232

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Substances can be classified as:

Elements can be divided into:

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.