10 chemistry questions

Common Entrance Chemistry – 10 Multiple choice questions
Answer all 10 questions and then press ‘Submit’
Your score and any corrections will then be shown
(Different questions each time the quiz is run)

1. Some copper foil is heated in a sealed test tube until the copper stops changing colour. What gas remains in the test tube?

2. bunsen1bThis diagram shows a Bunsen burner.
The flame is yellow and smoky.

Is the air hole open or closed?

3. Limestone and chalk are made of which chemical compound?

4. What would be the product when water is added to anhydrous copper sulphate?

5. 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? 

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. Name the PROCESS you would use to obtain a sample of SOLID SALT from some sea water

8. Galvanised iron sheets are made of iron coated with a very thin layer of which metal?

9. What colour is magnesium oxide

10. In a solution of salty water, the salt is called the