Common Entrance Chemistry – 30 Multiple choice questions

1. 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 ?
 
 
 
 
2. 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 metallic element ?
 
 
 
 
3. What process would be used to obtain the solute from a solution?
 
 
 
 
4. Which single piece of apparatus would be the best to use if you wished to find the volume of glass in a glass stopper
 
 
 
 
5. How would you try to identify water vapour in the air?
 
 
 
 
 
6. Word equations for 4 different reactions are shown.
Which of them shows oxidation and reduction taking place?
 
 
 
 
7. 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
 

The lid is important in this experiment.
If the lid was not used how would this effect the results? 
 
 
 
8. apparatus3What is the purpose of the piece of apparatus shown?
 
 
 
 
 
9. If a gardener wished to make his soil less acid, which of the following would be the best to do?
 
 
 
 
10. If a cup of tea is to kept warm it needs to be wrapped in what kind of material?
 
 
 
11. Which of the gases below is sometimes put in balloons to make them float?
 
 
 
 
12. bunsen2b-1This diagram shows a Bunsen burner.

Which is the hottest part of the flame?
 
 
 
 
13. Burning magnesium will react with carbon dioxide to produce a white smoke and leave small black specks of carbon.

What would be the products of the reaction between magnesium and carbon dioxide gas?
 
 
 
 
14. Put the following processes into the correct order if you wished to obtain pure salt from rock salt
 
 
 
15. Which of these is a chemical change?
 
 
 
 
16. Which of the following is NOT a metal
 
 
 
 
17. An acid would have what pH number?
 
 
 
18. Name a non-metallic element that conducts electricity
 
 
 
 
19. The best way to remove sand from water is
 
 
 
 
20. What gas is produced when calcium carbonate is added to dilute hydrochloric acid?
 
 
 
 
21. Akt_anim3  Bkt_anim2Ckt_anim1The blue circles in these diagrams repesent the particles in a substance

Which diagram represents a gas?
 
 
 
22. Name the PROCESS you would use to obtain a sample of SOLID SALT from some sea water
 
 
 
 
23. What colour is magnesium oxide
 
 
 
 
24. Is Mercury metal a solid, liquid or gas?
(at normal room temperature)
 
 
 
25. Some plastic is bio readable.

What does biodegradable mean?
 
 
 
 
26. 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.

The reaction above is an example of oxidation and reduction.

During this reaction, which chemical is being oxidised and which is being reduced?
 
 
 
 
27. What is the pH value of pure water?
 
 
 
 
28. What is the name of the chemical which has the formula CH4 ?
 
 
 
 
29. Galvanised iron sheets are made of iron coated with a very thin layer of which metal?
 
 
 
 
30. If Magnesium hydroxide (indigestion powder) were added to vinegar which of the answers would best describe what would happen?
 
 
 
 

 

Anamaria Stefanie
Anamaria Stefanie

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