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- @Pressure is measured in:
- Pa
- N
- m/s
-
- @Pressure is measured in Pascals (Pa), but what else could it be measured in
- N/m²
- N/kg
- kg/m
-
- @Iron boils at 3000°C and melts at 1245°C. What state is it in at 700°C?
- 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 12°C and 20°C. From this, what can be said about the speeds of the air molecules in each room?
- They travel faster in the 20°C 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 15cm³ of ice. When it has completely melted, what will be the volume of water?
- Less than 15cm³
- Still 15cm³
- More than 15cm³
-
- @Bromine boils at 58°C and melts at -7°C. At what temperature should it be kept if a liquid is required?
- 0°C
- 60°C
- 273°C
-
- @A beaker holds 50cm³ of water. It is heated until all the water has boiled away. What is the volume of steam produced?
- Much more than 50cm³
- Slightly more than 50cm³
- 50cm³, 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 64°C and boils at 760°C. 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