Mr Rawlinson

1

2   a   heat supplied     b          heat removed  c          heat removed  d          heat removed

e   heat supplied

3   a   evaporation        b          fusion              c          condensation   d          solidification

4   The process of diffusion—brown gas has moved through the spaces in the cellophane; the same with colourless gas.

5   a   The window was cold, the air was hot. The water condensed on the cold surface.

b   The demister warmed the windows so they were not cold enough to cause condensation.

c   The air conditioner could have cooled the air and reduced the humidity.

6   a   The higher the temperature the more energy the water molecules have and therefore more of them are able to escape into the atmosphere.

b   The glass is capable of slowly moving down over the century (glass is a supercooled liquid).

c   Solids have a rigid, fixed pattern—quartz crystals are formed according to a strict pattern.

d   The particles of gold are possibly packed together more tightly than the aluminium; gold particles are heavier than aluminium particles.

e   Water vapour is clear and colourless as it is a gas; steam is condensed particles of liquid water mixed with water vapour.

7   a   half full  b          100%   c          i B       ii 40 mL

8   a   the mercury thermometer

b   The gas will expand more for a small change in temperature than will the liquid, giving a more sensitive reading.

c   The coloured water will move down.

d  The picture has not come out. It is of the thermometer with the mercury up to 78

9   a   diagram of a heating curve:

·         time on the horizontal (controlled variable)

·         temperature on the vertical (independent variable)

b   » 80^oC

c   The naphthalene would freeze once again.

10 a   The particles of A and B react together at the surface of the two crystals.

b   i The grinding of the particles would increase the surface area of the contact and so they 

       would react more quickly.

     ii When the two were dissolved in water and mixed, the reaction would occur almost

        immediately.

11 warmed up: cooled down,condensation: evaporation,supply: remove,contracted: expanded,loose: tight,hot: cold,solidifying: melting

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• Forces of Nature practice test answers

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