The diagram shows some pieces of apparatus.
(4)
Letter | Name |
A | |
B | |
C | |
D |
(1)
☐ | A | ||
☐ | B | ||
☐ | C | ||
☐ | D |
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The diagram shows some pieces of apparatus.
(4)
Letter | Name |
A | |
B | |
C | |
D |
(1)
☐ | A | ||
☐ | B | ||
☐ | C | ||
☐ | D |
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A neutralisation reaction occurs between ammonia and sulfuric acid.
How does the sulfuric acid act in this reaction?
(1)
☐ | A | As a proton donor | |
☐ | B | As an electron acceptor | |
☐ | C | As a proton acceptor | |
☐ | D | As a neutron donor |
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A student makes some magnesium nitrate crystals from magnesium oxide and dilute nitric acid.
The equation for the reaction is
MgO (s) + 2HNO3 (aq) → Mg(NO3)2 (aq) + H2O (l)
a)
......................................... and ......................................
(2)
(6)
(1)
(3)
(2)
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The chemical equation for the preparation of lead (II) sulfate is written below.
Pb(NO3)2 (___) + Na2SO4 (___) → PbSO4 (___) + 2NaNO3 (___)
What are the state symbols for each substance in this reaction?
(1)
☐ | A | aq, aq, s, aq | |
☐ | B | aq, aq, s, s | |
☐ | C | s, aq, aq, s | |
☐ | D | s, aq, s, aq |
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A student investigates the neutralisation reaction between sodium hydroxide and nitric acid.
This is her method.
a)
(1)
(2)
(1)
The table shows the student’s results.
Total volume of acid in cm3 | 0 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 |
Temperature of reaction mixture in °C |
20.5 | 22.5 | 24.4 | 26.4 | 28.5 | 28.3 | 27.5 | 26.7 | 26.0 |
volume of acid = ...................................................................... cm3
maximum temperature = ............................................... °C
[2]
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A student making copper sulfate crystals used the method below.
Unreacted copper carbonate was left over as it had been added in excess.
What is the reason for adding it in excess and what would step 3 be of this method?
(1)
☐ | A | Reason: to produce a greater amount of salt crystals | Step 3: filtration | |
☐ | B | Reason: to improve the colour intensity of the crystals | Step 3: crystallisation | |
☐ | C | Reason: to ensure all the acid reacts | Step 3: filtration | |
☐ | D | Reason: to increase the rate of reaction | Step 3: evaporation |
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Which equation does not show the correct reaction of an acid?
(1)
☐ | A | copper oxide + hydrochloric acid → copper chloride + water | |
☐ | B | calcium carbonate + nitric acid → calcium nitrate + carbon dioxide | |
☐ | C | potassium hydroxide + sulfuric acid → potassium sulfate + water | |
☐ | D | zinc + sulfuric acid → zinc sulfate + hydrogen |
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A student was preparing the insoluble salt lead(II) sulfate from solutions of lead(II) nitrate and potassium sulfate.
Why could the student not use lead(II) carbonate to prepare this salt?
(1)
☐ | A | It has a high melting point | |
☐ | B | It is insoluble in water | |
☐ | C | it is toxic | |
☐ | D | It is flammable |
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This question is about the insoluble salt silver chloride (AgCl).
Silver chloride can be made by the reaction between copper(II) chloride and silver nitrate.
(4)
Volume of silver nitrate added in cm3 |
Height of precipitate in cm |
0.0 | 0.0 |
1.0 | 0.5 |
2.0 | 1.0 |
3.0 | 1.2 |
4.0 | 2.0 |
5.0 | 2.5 |
6.0 | 3.0 |
7.0 | 3.0 |
8.0 | 3.0 |
(2)
(1)
(1)
(1)
CuCl2 (aq) + 2AgNO3 (aq) → 2AgCl (s) + Cu(NO3)2 (aq)
(1)
(3)
maximum mass = ............................................................... g
(2)
percentage yield = ............................................................... %
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