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

1. How many elements are present in the compound calcium carbonate?
Calcium carbonate has the formula CaCO3
2. A spring is 10cm long.
When 3 newtons are hung from it the sprng becomes 16cm.

springs1What extension is caused by the load of 3N?
3. What is meant by a ‘Primary Producer’?
4. The diagram shows a roller coaster car moving downwards quite fast.

Which force is making the car speed up (X or Y)?
5. Scurvy, an illness that used to occur a lot in sailors taking long sea voyages, is cause by
6. 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

What mass of oxygen did the magnesium react with? 
7. Why might we add iodine solution to a slice of food in the laboratory
8. What chemical change will happen to copper foil when it is heated?
9. When crystals of copper sulphate are heated strongly in a test tube they
10. SALTY WATER is best described as….
11. A block measures 10cm x 8cm x 5cm
It has a mass of 2kg

What is the volume of the block (in cm³)?

12. Pick an alkaline oxide from the list
13. Akt_anim3  Bkt_anim2Ckt_anim1The blue circles in these diagrams repesent the particles in a substance

Which diagram represents a gas?
14. Which of the substances listed below is the odd one out?
15. Which is the largest out of

16. Why does a plant have root hairs on the root
17. Name a chemical that decomposes to release carbon dioxide when it is heated
18. This diagram shows a block of iron and a block of wood which have been added to a beaker of water.
Which would have the greatest density the water, wood or iron?
19. Lettuce —-> slug ——> thrush ——-> fox

The third organism in any food chain will always be a
20. Antibiotics kill which type of organism?(tick all that apply)
21. air

Look at the diagram above.

100 cm3 of air is put in one of the syringes. When the copper is heated it reacts with the oxygen in the air inside the syringe.

The syringe plungers are moved in and out so that all of the air is passed over the hot copper. When there is no further change the apparatus is allowed to cool (to allow the heated air to contract.Some copper remains unreacted because there is no oxygen left in the syringe.The gas remaining in the syringe is mostly nitrogen.ResultsVolume of air in syringe at start = 100cm3
Volume of air in syringe after heating = 79 cm3
 What volume of air was used up by the copper?
22. What percentage of the air is oxygen (approximately)?
23. Pick the correct sentence from those given to best  describe the term below:

24. An alloy of Copper and tin is called
25. After a girl reaches puberty, how often will her body release an egg?
26. Pick an acidic oxide from the list
27. Some copper foil is heated in a sealed test tube until the copper stops changing colour.
What colour does the copper become?
28. Which of these is a chemical change?
29. The diagram below shows a light ray passing through a glass block.

light3-300x278This digram represents which physical process?
30. 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.