Practise c) Explain, in terms of electrons, why the alkali metals get more reactive as you go down the group.
[2]
d) Why do the alkali metals have to be stored under oil?
[2] Total Marks
/6
States of Matter 1
What do the state symbols (g) and (aq) mean?
[2]
2
HT
3
Calcium reacts with hydrochloric acid to produce calcium chloride and hydrogen:
Give three limitations of the particle model.
Ca(s) + 2HCl(aq)
[3]
CaCl2(aq) + H2(g)
What is the state of the: a) Calcium?
b) Hydrochloric acid?
c) Hydrogen? Total Marks
[3] /8
Ionic Compounds 1
Table 1 shows the charge on some metal ions and non-metal ions. Table 1
a) What is an ion? b) In terms of electron transfer, explain why chloride ions have a 1– charge. c) In terms of electron transfer, explain why magnesium ions have a 2+ charge.
Metal Ions
Non-Metal Ions
Sodium, Na+
Chloride, Cl –
Magnesium, Mg2+
Oxide, O2–
Potassium, K+
Fluoride, F –
Calcium, Ca2+
Sulfide, S2–
[1]
[2]
[2]
d) Use the information in the table to determine the formula of: i) Potassium chloride
ii) Magnesium sulfide
iii) Calcium oxide.
[3]
e) Magnesium oxide has a very high melting point and can be used to line furnaces. Explain why the compound magnesium oxide has a high melting point.
[2]
Total Marks
/ 10
Practise
227841 AQA Higher Tier Combined Science All-in-One_P110_119.indd 111
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6/29/16 11:25 AM