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Chemistry µGCSE:
States (iGCSE)
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10 minutes maximum! (can you do it in 5?)  

Q1-3. The diagram shows particles of a substance in three states of matter.

X Y Z

Yelod - CC 3.0

1. Which of the following statements is true about diagrams X, Y and Z?
  • A.   ‘X’ shows a gas and  ‘Y’ shows a liquid
  • B.   ‘X’ shows a gas and  ‘Z’ shows a solid
  • C.   ‘Z’ shows a gas and  ‘X’ shows a liquid
  • D.   ‘Z’ shows a liquid and  ‘Y’ shows a solid

2. Which of these diagrams shows the particles with the most and the least energy?

  Most energy Least energy
A X Z
B X Y
C Y X
D Y Z

3. Which change occurs during freezing?

  • A.   Z to Y
  • B.   X to Y
  • C.   Y to Z
  • D.   X to Z

4. The particles vibrate about a fixed position in a ….

  • A.   gas
  • B.   liquid
  • C.   solid
  • D.   solution

5. In which substance are the particles close together and slowly moving past each other?

  • A. steam
  • B. water
  • C. ice  
  • D. oxygen
6. The particles in molten wax are arranged differently compared to solid wax. The particles in molten wax are …….
  • A. closer together and moving faster.
  • B. closer together and moving slower.
  • C. further apart and moving faster.
  • D. further apart and moving slower.

Q7+8: These questions concern changes of state.

What is the name of the interconversion when ……

 
7. ...molten iron changes to solid iron.
8. ...steam changes to water.

 

9. A crystal of copper sulfate was placed in a beaker of water. After some time the crystal had disappeared and the water had turned blue.

Which two processes had taken place?

  • A.   melting and evaporation
  • B.   melting and diffusion
  • C.   dissolving and evaporation
  • D.   dissolving and diffusion

10. A gas jar of air is placed on top of a gas jar of brown bromine gas as in figure 1. The glass disc was removed and after 15 minutes both jars are full of pale brown gas as in figure 2:

bromine diffusion demo

Which statement best explains why the bromine and air mix together as shown?

  • A.   Air molecules sink and bromine molecules rise
  • B.   Air and bromine molecules move around randomly
  • C.   Air is less dense than bromine
  • D.   Air is denser than bromine