Common Entrance Chemistry – 30 Multiple choice questions

1. The word equation below shows the reaction between iron and copper sulphate solution

Iron + copper sulphate  →  ******** + iron sulphate What is the missing chemical from the equation?
2. Which of the following is true about air?
3. Pick a black solid from the list below
4. Sucrose is the chemical name for which common substance?
5. Name the PROCESS you would use to obtain a sample of SOLID SALT from some sea water
6. Name a chemical that decomposes to release carbon dioxide when it is heated
7. Citric acid would be found in which house-hold substance?
8. 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?
9. What type of acid is found in your stomach?
10. Some salt is dissolved in warm water.
What do we call the liquid remaining in the beaker?
11. Pick an element from the list shown
12. When crystals of copper sulphate are heated strongly in a test tube they
13. What is the test for oxygen gas?
14. 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.

Which pen has an ink made from 4 dyes mixed together?Chromatography_tank2
15. What is the chemical symbol for magnesium?
16. What gas is produced when zinc is added to dilute sulphuric acid?
17. Is Mercury metal a solid, liquid or gas?
(at normal room temperature)
18. flaskThe image represents what piece of apparatus?
19. Powdered wood charcoal (carbon) is mixed with copper oxide and heated strongly.
A red glow is seen to spread though the mixture. When the mixture has cooled a pink residue is seen.

Name the two products of this reaction.
20. Word equations for 4 different reactions are shown.
Which of them is an example of a displacement reaction?
21. What process would be used to obtain the solute from a solution?
22. When copper foil is heated with a roaring bunsen flame and it quickly turns black.
What is the name of the black chemical formed?
23. Which is the best way to get the salt back from some salty water
24. How can alcohol be obtained from wine?
25. What is the pH value of pure water?
26. Exactly enough sodium hydroxide solution is added to hydrochloric acid to make a neutral solution.
How can salt (sodium chloride crystals) be obtained from the resulting solution?
27. If a cup of tea is to kept warm it needs to be wrapped in what kind of material?
28. What colour is copper carbonate?
29. Some copper foil is heated in a sealed test tube until the copper stops changing colour. What gas is the copper reacting with?
30. Ca is the symbol for which chemical element