CIE Chemistry (US-0439): Specimen Questions with Answers 13 - 16 of 240

Question number: 13

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Mono

b.

Di

c.

Tri

d.

Poly

Answer

d.

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 number: 14

Short Answer Question▾

Write in Short

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 number: 15

Short Answer Question▾

Write in Short

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. .

Question number: 16

Short Answer Question▾

Write in Short

Aluminum is used to make high voltage electricity cables.

details of four metals

Details of Four Metals

details of four metals

The table shows some properties of four metals which could be used for overhead power cables.

overhead power cables.

Overhead Power Cables.

overhead power cables.

  1. Give two reasons why aluminum is used for overhead power cables rather than copper.

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

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

Explanation

  1. Aluminum is used for overhead power cables rather than copper because aluminum has less electrical conductivity.

  2. Aluminum is used for overhead power cables rather than copper because Aluminum has less melting point.