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Chemistry

Page 8

A basic postulate of the kinetic theory of gases is that the molecule of gases move in straight lines between collisions. This implies that

a.

Collisions are perfectly elastic

b.

Forces of repulsion exist

c.

Forces of repulsion and attraction are in equilibrium

d.

Collisions are inelastic

Which of the following sources of energy contributes to the green-house effect

a.

Natural gas

b.

Nuclear

c.

Wind

d.

Solar

Alluminium is used in the manufacture of aircraft because it:

a.

is hard and brittle

b.

is light and resists corrosion

c.

has high density and conducts electricity

d.

is malleable and ductile

Four elements W, X, Y and Z have atomic numbers 2, 6, 16 and 20 respectively. Which of these elements is a metal?

a.

X

b.

W

c.

Z

d.

Y

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