HELP

Question / Answer / Mark
1 / a / It contains different types of molecules. / 1
b / 5 / 1
c / 1 / 1
d / 6 / 1
e / Oxygen, nitrogen and helium. / 3
f / i / 2 / 1
ii / Water and carbon dioxide. / 2
Total for Help / 10

CORE

Question / Answer / Mark
2 / a / The mixtures are:
cough medicine, hair shampoo, sea salt, exhaled air, tap water.
The pure substances are:
zinc oxide, salt (sodium chloride), carbon dioxide, distilled water. / 5
All correct = 5 marks. Deduct 1 mark for each misplaced item to a maximum of 5.
b / C somewhere before E.
E somewhere before A.
A somewhere before B.
B somewhere before D. / 1
1
1
1
Total for Core / 9

EXTENSION

Question / Answer / Mark
3 / a / Citric acid or lemon juice. / 1
b / Bits of orange flesh. / 1
c / i / It was soluble in the juice. / 1
ii / 1650 mg / 1
d / i / It might be water / 1
ii / It contains hydrogen and oxygen in the same ratio as water/it has the same fixed composition as water. / 1
e / Do chromatography
by spotting the juice onto chromatography paper
standing it in a solvent
and allowing the solvent to spread up the paper. / 1
1
1
1
f / i / The water
after distillation / 1
1
ii / It had a fixed boiling point/it had a fixed composition. / 1
g / It is the main component of the juice. / 1
Total for Extension / 14

s

© Harcourt Education Ltd 2004 Catalyst 2

This worksheet may have been altered from the original on the CD-ROM.