IGCSE Chemistry: Specimen Questions with Answers 13 - 15 of 240

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Question 13

Question

MCQ▾

molecule is made of four atoms of phosphorous. So it՚s a ________ atomic molecule.

Choices

Choice (4)

a.

Tri

b.

Poly

c.

Di

d.

Mono

Answer

b.

Explanation

A molecule of an element which consists of more than three atoms of that element is called ‘polyatomic’ molecule.

molecule is made of four atoms of phosphorous. So it՚s a polyatomic molecule.

Question 14

Write in Short

Short Answer▾

Impure water needs to be treated if it is to be used in the home.

Is the bonding in water covalent or ionic? Give a reason for your answer.

Explanation

The Configuration of the Water Molecule. A molecule of water is composed of two atoms of hydrogen and one atom of oxygen. … So, oxygen shares one of its outer electrons with each of two hydrogen atoms, and each of the two hydrogen atoms shares it՚s one and only electron with oxygen. This is called a covalent bond.

Question 15

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Write in Short

Short Answer▾

Which physical property is used to distinguish between metals and non-metals? It is possessed by all metals but by only one non-metal (1 Marks)

Explanation

Boiling point is the physical property.

Tungsten (metal) selenium (non-metal) are the elements with highest boiling point. .

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