CIE Chemistry Paper-1: Specimen Questions 90 - 92 of 99

Question number: 90

MCQ▾

Question

As we move from left to right, what impact does it have on the atomic size of the elements.

Choices

Choice (4) Response
a.

Atomic size remains the same.

b.

The atomic size increases

c.

The atomic size decreases

d.

Atomic size variates

Answer

c.

Explanation

Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius.

Increase in size from left to right

Increase in size from left to right

Decrease in size from right to left

Question number: 91

MCQ▾

Question

How many isomers does butane have?

Choices

Choice (4) Response
a.

2

b.

3

c.

1

d.

4

Answer

a.

Explanation

Butane (C4H10) has two structural isomers.

Isomer 1 is the straight chain normal structure for butane (called n-butane).

Straight chain normal structure for butane

Straight chain normal structure for butane

Diagram for n-butane

Isomer 2 (called 2-methylpropane) is a different structure with a branched chain which has a carbon atom joined onto three other carbon atoms.

Carbon atom joined onto three other carbon atoms.

Carbon atom joined onto three other carbon atoms.

Understanding a different carbon join to other atoms

Question number: 92

MCQ▾

Question

In the following diagram, two nails are fixed on a cork and is placed in a beaker. The nails are connected to the two terminals of a battery through a bulb. When a substance X is poured in the beaker the bulb started to glow. What

 Solution X in Water connected to battery

Solution X in Water connected to battery

Two nails are fixed on a cork and is placed in a beaker, Find Substance X

Choices

Choice (4) Response
a.

Alcohol

b.

Hydrochloric acid

c.

Glucose

d. All of the above

Answer

b.

Explanation

Glowing of bulb indicates that there is a flow of current through the solution The electric current is carried through the solution by ions. Whereas alcohol and glucose does not conduct electricity.

Since the cation present in acids is H+, this suggests that acids produce hydrogen ions, H+ (aq), in solution, which are responsible for their acidic properties.

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