@Pressure is measured in:
Pa
N
m/s

@Pressure is measured in Pascals (Pa), but what else could it be measured in
N/m
N/kg
kg/m

@Iron boils at 3000C and melts at 1245C. What state is it in at 700C?
Solid
Liquid
Gas

@The diagram shows a piston inside a cylinder. As the piston moves down then the trapped air inside:
#pre1
Heats up
Cools down
Stays at the same temperature

@The temperatures inside two rooms are 12C and 20C. From this, what can be said about the speeds of the air molecules in each room?
They travel faster in the 20C room
There is not enough information to make a comment
Since both contain air molecules then they must be travelling at the same speed

@A test tube contains 15cm of ice. When it has completely melted, what will be the volume of water?
Less than 15cm
Still 15cm
More than 15cm

@Bromine boils at 58C and melts at -7C. At what temperature should it be kept if a liquid is required?
0C
60C
273C
  
@A beaker holds 50cm of water. It is heated until all the water has boiled away. What is the volume of steam produced?
Much more than 50cm
Slightly more than 50cm
50cm, as before

@If you try and squeeze a solid, such as stone, you have little effect. This is because:
repulsive forces within the substance act
hydrogen bonding takes place
molecules of the substance 'flow' over each other, absorbing the force

@An unpleasant smell can spread quickly throughout a large room by:
diffusion
evaporation
radiation

@In which substance is diffusion quickest?
Gas
Solid
Liquid

@Potassium melts at 64C and boils at 760C. At room temperature it will be:
Solid
Liquid
Gas 

@Two, thin, tubes are placed in water as shown. After a few days, what will be seen?
#capil
The water in the smaller tube will have risen more than the larger tube
No change
Water in the larger tube will have risen much more than the smaller one

What can be said about the air molecules inside a fridge, compared to those in the room?
They are moving more slowly
They are colder
They are smaller

@How are the air molecules inside a hot oven different to those in the kitchen?
They are moving faster
They are larger
They are warmer

@Smoke particles, viewed under a microscope, appear to 'wobble'. This is because they are:
being hit by smaller invisible particles
vibrating because they are warm
a gas, and all gases do this naturally

@How many electrons does this neutral atom have?
#atom1
Three
Two
Five

@How many protons does this neutral atom have?
#atom1
Three
Two
Five

@What is the atomic number of this neutral atom?
#atom1
Three
Five
Two

@How would an isotope of this neutral atom be different?
#atom1
It would have a different number of neutrons
The numbers of protons and electrons would be different
The atomic number would be increased by one

@The nucleon (mass) number of this neutral atom is:
#atom1
the total number of protons and neutrons added together
exactly equal to the number of electrons
only depends on the number of neutrons in the nucleus