Unit 3 Pretest Homework.

Name Class

This homework has the same structure as a unit test. Do your revision first and try to do the test in 45 minutes.

Part A.

This part of the paper consists of 12 questions 1 mark each

In question 1-4 choose the correct word from the following list to complete the sentence.

electrolysis, combustion, acidic, alkaline, decreases, increases, lime, salt

1. If there are more hydroxide ions than hydrogen ions a solution is

2. When a direct electric current is passed through a solution the process is

3. When water is added to an acid the pH

4. If a farmers field is too acidic might be added.

Question 5 to 12 are multiple-choice questions. Circle the correct answer.


5.


Part B

This part of the paper consists of 7 questions and is worth 18 marks

13. Aluminium is a very important metal.

Name the process by which it is extracted 1

(a)

(b) Why is iron not always produced by the same method 1

(c) Iron can be connected to a negative terminal of a DC supply to protect it what name is given to this protection. 1

14. Ethanoic acid is neutralised by ammonia solution

(a) What happens to the pH of the acid as it is neutralised.?

1

(b)Name the salt formed

1

(c) What volume of 0.1mol l-1 ammonia will neutralise 50 cm3 of 0.5 mol l-1 ethanoic acid

Space for working

1

15. When powdered zinc is added to copper(II) sulphate solution a brown solid appears.

(a)What type of reaction is this?

(b) Name the spectator ion in this reaction.

1


16. A student titrated hydrochloric acid with sodium carbonate and measured the volume of gas given off they produced the following set of results.

Volume of sodium carbonate(cm3) / Volume Carbon dioxide produced(cm3)
0 / 0
5 / 3
10 / 6
14 / 8.5
21 / 12.5
25 / 15

(a) Draw a line graph of the results. 2

(b) what name could be given to this reaction? 1


17. Six experiments were set up to measure the voltage between two metals

A / B / C
Fe Zn
20oC
Salt water / Al Zn
30oC
Distilled water / Al Zn
20oC
Salt water
D / E / F
Fe Zn
20oC
Distilled water / Fe Zn
20oC
Tap Water / Al Zn
30oC
Tap water

(a)Which two experiments could be used to compare Iron and aluminium?

and 1

(b) In which of the experiments will Zinc corrode most rapidly 1

(c) If ferroxyl indicator was added to the solutions which solution(s) would change colour.

1

18. Three metals are placed in acid then their oxide is heated with carbon. The results are shown in the table below.

Metal / Reaction with acid / Reaction of oxide with carbon
A / No reaction / No reaction
B / No reaction / Metal formed
C / Reacts with acid / No reaction

(a)  State from the reaction with acid alone, what we can say about the reaction of the metals.

1

(b) Place the metals in order of reactivity, starting with the most reactive.

1