Edexcel Chemistry international GCSE (9-1)
Chapter_10_ test_1
Chapter 10 (Acids, Bases and Salts) Test_1_Answers
Q1.
(a)
(i)
carbon dioxide / carbonate
[2]
(ii)
copper hydroxide
[1]
(iii) Ba2+(aq) + SO42–(aq) 
→ BaSO4(s)
[2]
add silver nitrate solution
[1]
chloride: white precipitate
[1]
bromide: cream precipitate
[1]
iodide: yellow precipitate
[1]
(i)
bubbles / effervescence / fizzes
[1]
(ii)
zinc + hydrochloric acid 
→ zinc + hydrogen
[2]
(b)
Q2.
(a)
(iii) indicator turns red / solution is acidic
[2]
(i)
Solution
[1]
(ii)
Precipitate
[1]
Q3.
(a)
(b)
(iii) Filtered
[1]
(iv) Dried
[1]
(i)
[1]
effervescence/fizzing/bubbles
zinc carbonate becomes smaller/disappear
(ii)
limewater becomes milky
[2]
(i)
C lead iodide
[1]
(ii)
Lead nitrate + potassium iodide 
→ potassium nitrate + lead iodide
[2]
Q4.
(a)
(iii)
1
[2]
Mostafa Barakat (0100 165 44 62)
Edexcel Chemistry international GCSE (9-1)
Chapter_10_ test_1
(b)
[2]
(c)
KCl
[1]
Gain of one electron
[2]
(a)
lead nitrate and sodium carbonate
[2]
(b)
White precipitate
[1]
barium sulfate insoluble
[1]
barium sulfate opaque to X-rays / insoluble
[1]
(i)
C ionic
[1]
(ii)
D 851 ºC
[1]
(ii)
Q5.
(c)
(d)
(e)
Na2CO3
Q6.
(a)
(i)
White precipitate
[2]
(ii)
D
[1]
add (sodium) hydroxide (solution)
[1]
Heat
[1]
Ammonia gas produced which has pungent smell
[1]
(b)
2
Mostafa Barakat (0100 165 44 62)
Edexcel Chemistry international GCSE (9-1)
Chapter_10_ test_1
Q7.
(a)
(i)
mass of magnesium sulfate = 18.50 – 18.20 = 0.30 g
conc =
(b)
0.3
= 0.6 g dm−3
0.5
[2]
[2]
(i)
Pipette
[1]
(ii)
phenolphthalein
[1]
pink
[1]
colourless
[1]
measure sulfuric acid into a beaker
[1]
stir / heat
[1]
add copper oxide until solid remains
[1]
filter the mixture to remove unreacted copper oxide
[1]
heat until concentrated
[1]
allow to cool and crystallise
[1]
pour off remaining solution to leave crystals
[1]
dry crystals with filter paper
[1]
pipette 25 cm3 of ammonia solution in a conical flask
[1]
Add few drops of phenolphthalein to conical flask
[1]
fill burette with sulfuric acid solution
[1]
add acid from the burette until indicator just changes colour
[1]
(c)
(d)
record volume of acid added
Repeat experiment without indicator
mix the same volumes of sulfuric acid and ammonia solution
determined from the titration experiment
heat the solution to point of crystallisation
leave to cool
filter off crystals
3
Mostafa Barakat (0100 165 44 62)
Edexcel Chemistry international GCSE (9-1)
Chapter_10_ test_1
wash with distilled water
leave to dry
4
Mostafa Barakat (0100 165 44 62)