Common Entrance Revision: Includes more advanced questions
30 questions suitable for scholarship               KS3 Levels 5 and 6

1. When copper foil is heated with a roaring bunsen flame and it quickly turns black.
What is the name of the black chemical formed?
2. Heat from the sun reaches us by
3. What happens when a boy reaches puberty?

(puberty is the time when his body starts to change in appearance, sometime between 10 and 14 years old)
4. What type of acid is found in your stomach?
5. What do we call the line followed by a planet as it moves around the sun?
6. Peter has three coloured felt pens which he labelled A, B and C.
He used the apparatus below to separate the dyes used to make colours from each of the pens.

Chromatography_tank2What is the name of the process being carried out? 
7. The picture shows a submarine.
There are two forces acting on the submarine
represented by red arrows.

What is the name of the force labelled X?
8. Which of the energy changes below represents that which takes place in an electric motor?
9. Burning coal converts chemical energy into what kinds of energy (tick TWO boxes)
10. What is the hard outside part of the tooth made from?
11. circuit3Look at the circuit diagram and say which of these statements is true.
12. An animal carries out respiration in order to….
13. What atoms is diamond made out of?
14. Name the waste gas that we breath out
(produced during respiration)
15. The legs of a chair each have an area of 20cm2 .

The chair has  4 legs and a mass of 4kg.

If the chair had thinner legs (the area of each leg was less) what effects would this have?
16. What would be the product when water is added to anhydrous copper sulphate?
17. Which of the properties of metals listed below is not correct?
18. Why is it preferable for ice skates to have a very thin edge?
19. Why is the mineral Iron important in our diet?
20. A block measures 10cm x 8cm x 5cm
You are told that the block is made out of iron which has a density of 7g/cm³

What is the mass in kg?
21. The legs of a chair each have an area of 20cm2 .

The chair has  4 legs and a mass of 4kg.

What is the pressure of each leg on the ground?
22. Photosynthesis is how plants make food

Why does photosynthesis usually stop at night?

23. How many elements are present in the compound calcium carbonate?
Calcium carbonate has the formula CaCO3
24. How is hydrogen made in the laboratory?
25. About 20cm of magnesium ribbon is chopped up into 1cm lengths and placed in a crucible which is then weighed along with its lid.
The crucible is heated strongly and the lid gently raised avery few seconds.

When the reaction is over the crucible + contents + lid are all re-weighed

These are his results:
  • Mass of empty crucible + lid  = 51.2g
  • Mass of crucible + lid + magnesium (before heating) = 54.3g
  • Mass of crucible + lid + contents (after heating) = 54.7g

Did the magnesium gain mass, loose mass or not change in mass?
26. A change of electrical energy into kinetic (speed) energy could be produced by
27. What is the length  of time between fertilization and the birth of a human baby?
28. Substances can be obtained from the ground and purified in a variety of ways.

Which mineral can be extracted from the ground by pumping water into the ground which causes it to dissolve. The substance is then purified by letting the water evaporate.
29. Which part of a plant does pollen have to reach during pollination?
30. This question is about radiation of heat
A black object will be a …..