IGCSE Chemistry: Specimen Questions with Answers 106 - 108 of 240

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Question 106

Question

MCQ▾

Before the theory proposed by Newton, what was the idea regarding bonding of atoms?

Choices

Choice (4)

a.

2 atoms collide and form a bond

b.

Atoms have hooks to which they get attached and form a bond

c.

2 atoms overlap with each other to form a bond

d.

None of the above

Answer

b.

Explanation

Before the theory proposed by Newton, the idea regarding bonding of atoms was that the atoms have hooks to which they get attached and form a bond. The scientists in those days probably got influenced by the hand of the pirates where a hook was attached to one of their hands.

The Atoms Have Hooks

Question 107

Question

MCQ▾

The functional group present in alcohols is:

Choices

Choice (4)

a.

COOH

b.

OH2

c.

OH

d.

CHO

Answer

c.

Explanation

Correct option is C. Functional group is an atom or a group of atoms which defines the structure and the chemical and physical properties of a particular family of the organic compounds.

Alcohols have functional group.

Primary alcohol

OH Functional Group

Question 108

Edit

Write in Short

Short Answer▾

One of the factors which determine the reaction rate of solids is particle size.

An explosion is a very fast exothermic reaction. This causes a large and sudden increase in temperature.

Explain each of the following in terms of collisions between reacting particles.

Why is the reaction between finely powdered aluminum and air very fast?

Explanation

Because it is Highly flammable. Ignites spontaneously in air. Reacts with water to generate flammable gaseous hydrogen and heat.

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