@Heat is another form of:
Energy
Work
Power

@A liquid is heated until its molecules move very much faster, and the distance between them becomes very large. This process could describe:
Boiling
Melting
Condensation

@Which of the following has the highest temperature?
Filament of a light bulb
A swimming pool full of warm water
The water in a boiling kettle

@The heat needed to change a solid to a liquid is called:
Latent heat
Energy
Fusion

@A burn from steam is worse than a burn from boiling water because:
The temperature of steam can be more than 100C
Steam is a gas
Steam molecules move more slowly

@When a puddle of water slowly disappears over a period of time is called:
Evaporation
Sublimation
Diffusion

@A container has a liquid in it. Which one of the following will NOT speed up evaporation?
Having more liquid in the container
Heating the liquid
Blowing across the liquid

@When a liquid evaporates, what other effect might you notice?
The liquid left behind is cooler
The liquid left behind expands
The liquid left behind is not changed in any way

@Liquids cool after evaporation because:
only slower moelcules with less energy are left behind
all the molecules left behind speed up
the molecules left behind get smaller

@An electric motor wastes 20% of the energy supplied by producing heat. How efficient is the motor?
80%
120%
20%

@Adding salt to boiling water does what to its boiling point?
Raises it
Lowers it a little
Lowers it a lot

@On a high mountain water boils at a temperature:
below 100C
above 100C
at 212C

@In winter, water pipes sometimes burst because:
Ice expands when it forms
Ice is cold
The substance the pipes are made of shrinks and cracks

@Ice is taken from a fridge and heated. Its temperature is constantly checked. What do the readings show?
The temperature remains around 0C until all the ice is melted, and then rises
The temperature immediately, and steadily, rises
The temperature quickly rises to 4C and then remains constant until all the ice has melted

@A fridge works on the principle of:
Evaporation
Convection
Sublimation

@What effect does pressure have on the boiling point of a liquid?
Increasing pressure causes it to rise
None at all
Lowering the pressure raises the boiling point