Common Entrance Chemistry – 30 Multiple choice questions

1. What is the chemical symbol for iron?
 
 
 
 
2. Pick a chemical that will not change in mass when heated
 
 
 
 
3. You have four substances which you label A, B, C and D.
One is a mixture, one a metallic element one a non-metallic element and one a compound.

They have the following properties:
AA yellow, crumbly solid that burns to form a single colourless gas which turns universal indicator red
BA grey, malleable solid that burns to form a single white alkaline oxide
CA colourless liquid. The liquid is warmed in a shallow dish and after a few minutes a white residue is seen
DA green solid that decomposes when heated to form a colourless gas and leave a black powder
Which of the substances is likely to be a non-metallic element ?
 
 
 
 
4. Which of the below is not an example of a chemical change?
 
 
 
 
5. When a bunsen burner is lit, should the air-hole be open or closed?
 
 
6. Pick an neutral oxide from the list
 
 
 
 
7. Which of the following is true about air?
 
 
 
 
8. This diagram shows the water cycle
water cycle3Where does the energy come from that drives the water cycle?
 
 
 
 
9. I know that air is a GAS because (pick all that apply)
 
 
 
 
10. What is the test for carbon dioxide gas?
 
 
 
 
11. What is the name of the chemical which has the formula CH4 ?
 
 
 
 
12. What happens to sugar when you stir it into a cup of tea?
 
 
 
 
13. What is the test for carbon dioxide gas?
 
 
 
 
14. Flour is INSOLUBLE in water. When flour is shaken with water what will it form?
 
 
 
 
15. Sucrose is the chemical name for which common substance?
 
 
 
 
16. What is the pH value of pure water?
 
 
 
 
17. When clothes dry the water is
 
 
 
 
18. You have four substances which you label A, B, C and D.
One is a mixture, one a metallic element one a non-metallic element and one a compound.

They have the following properties:
AA yellow, crumbly solid that burns to form a single, colourless gas which turns universal indicator red.
BA grey, malleable solid that burns to form a single, white, alkaline oxide.
CA colourless liquid. The liquid is warmed in a shallow dish and after a few minutes a white residue is seen.
DA green solid that decomposes when heated to form a colourless gas and leave a black powder.
Which of the substances is likely to be a compound ?
 
 
 
 
19. Which of the gases below does not burn?
 
 
 
20. Word equations for 4 different reactions are shown.
Which of them is an example of a displacement reaction?
 
 
 
 
21. Name the two products when magnesium reacts with zinc oxide
 
 
 
 
22. Pencils are sometimes called ‘Lead pencils’ even though the lead has been replaced by which substance?
 
 
 
 
23. A liquid with a pH of 9 would be described as …..
 
 
 
 
24. Complete the word equation:
Hydrochloric acid + sodium hydroxide      ?
 
 
 
 
25. apparatus3What is the purpose of the piece of apparatus shown?
 
 
 
 
 
26. A liquid with a pH of 6 would be described as …..
 
 
 
 
27. What process would you  use to remove the flour from a suspension of flour in water?
 
 
 
 
28. 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?
 
 
 
 
29. Jane has two bowls on her bench.
One contains fine brown sugar. The other contains sand.
To find out which was which she stirred each into some warm water. Which will dissolve?
 
 
 
 
30. What process would be best used to obtain pure water from sea water?