1.
State what is meant by an acid. [1]
JD SCIENCE
Unit 4 worksheet — Extracting metals and equilibria
Answer all questions. Show working. Answers are in a separate file on the Worksheets page — do not look at them until you have finished.
2.
State what is meant by an alkali. [1]
3.
State what is meant by a salt. [1]
4.
State what is meant by electrolysis. [1]
5.
State what is meant by reduction. [1]
6.
State what is meant by oxidation. [1]
7.
State what is meant by the reactivity series. [1]
8.
State what is meant by a displacement reaction. [1]
9.
State what is meant by neutralisation. [1]
10.
State what is meant by the extraction of iron. [1]
11.
Devon is asked about an acid in a Edexcel Chemistry paper.
(a) Describe an acid. [2]
(b) Explain why an acid is important in this topic. [3]
12.
Devon is asked about an alkali in a Edexcel Chemistry paper.
(a) Describe an alkali. [2]
(b) Explain why an alkali is important in this topic. [3]
13.
Devon is asked about a salt in a Edexcel Chemistry paper.
(a) Describe a salt. [2]
(b) Explain why a salt is important in this topic. [3]
14.
Devon is asked about electrolysis in a Edexcel Chemistry paper.
(a) Describe electrolysis. [2]
(b) Explain why electrolysis is important in this topic. [3]
15.
Devon is asked about reduction in a Edexcel Chemistry paper.
(a) Describe reduction. [2]
(b) Explain why reduction is important in this topic. [3]
16.
Devon is asked about oxidation in a Edexcel Chemistry paper.
(a) Describe oxidation. [2]
(b) Explain why oxidation is important in this topic. [3]
17.
HCl + NaOH → NaCl + H₂O. 25.0 cm³ of 0.100 mol/dm³ HCl is neutralised. Moles of HCl? [3]
18.
If the NaOH volume was 20.0 cm³, what is its concentration? [3]
19.
pH of 0.010 mol/dm³ strong monoprotic acid (if [H⁺]=0.010). [3]
20.
Mass of Cu from Cu²⁺ + 2e⁻ → Cu if 0.25 mol of electrons flow. [3]
21.
A metal oxide is 80% metal by mass. Mass of metal in 50 g of oxide? [3]
22.
In 2Al + Fe₂O₃ → Al₂O₃ + 2Fe, moles of Al needed for 0.5 mol Fe₂O₃? [3]
23.
Devon carries out making a soluble salt from an acid and a metal oxide or carbonate. This is a typical Edexcel required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
24.
Devon carries out electrolysis of aqueous copper chloride or sodium chloride (demonstration if chlorine). This is a typical Edexcel required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
25.
Devon carries out displacement reactions of metals with metal salt solutions. This is a typical Edexcel required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
26.
Devon carries out pH measurement of acids of different concentration. This is a typical Edexcel required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
27.
Compare a strong acid with a weak acid. [4]
28.
Compare reduction with carbon with electrolysis. [4]
29.
Compare the cathode with the anode. [4]
30.
Compare an acid + a metal with an acid + a carbonate. [4]
31.
Apply your knowledge of the reactivity series to this situation: copper is less reactive [3]
32.
Apply your knowledge of a displacement reaction to this situation: more reactive element takes the oxygen [3]