Thermal expansion
1 Write the following in
order of increasing expansion: liquid, gas, solid.
2 Write down three
examples of the expansion of a solids.
3 Give two reasons why
mercury is used in thermometers.
4 Why is alcohol used in
some thermometers?
5
(a)What is a bi-metallic strip?
Aluminium expands more than
copper.
(b) what wil happen when it is put in a
freezer?
6 What happens to the volume of a sample of
water when it is frozen?
7 What would you expect
the temperature at the bottom of a pond to be if the water at the top of the
pond had frozen?
8 (a) a metal washer is
heated. What happens to the hole in the centre of the washer?
(b) What would happen
if the piston and cylinder in a car engine were made of metals that expanded by
different amounts when heated?
9 What would be the
approximate increase in length of a 100 cm long iron rod if it is heated by 500C?
10 Glass is a poor
conductor of heat. Why will a hot, thick glass beaker break if put gently but
quickly into cold water? Suggest why this does not happen if the beaker is made
of:
(a) aluminium;
(b) Pyrex glass.
11 The air in a closed
cylinder at a pressure of 50 000 Pa and at 27 oC is heated to 2270C.
What is its new pressure?
12 The absolute temperature
of the gas in a closed cylinder is reduced to ½ of the original value. What
happens to its pressure?
13 A fixed mass of gas has
a volume of 4 m3 at 270C and at a pressure of 150 000 Pa.
The pressure is now reduced to 100 000 Pa and the volume is decreased at the
same time to 0.5 m3.
What is the final temperature of the gas?
14 If
the temperature of a gas is raised, what happens to the pressure of the gas if
its volume stays the same?
15 What is meant by
absolute zero?
16 What is the value of
absolute zero?
17 What is:
(a)
00C in K; (b) 100o in K?
18 If 4litres of gas at 27oC are
heated to 1270C at a constant pressure, what will be the new volume
of the gas?
19 What happens to the pressure of the air in a
car tyre during a long journey on a hot day?
20
Draw a graph to show:
(a)
how the volume of a gas changes if it is heated at a constant pressure
(b)
how the pressure of a gas changes if it is heated at constant volume
(c)
how the pressure of a gas changes if it is expanded at a constant temperature
