Chemistry
National 5 Chemistry 2025/26 Updated Questions & Answers
(Verified answers), 100% Guaranteed Pass ||Complete A+
Guide
This Document Contains:
75 National 5 Chemistry
Answer Sheet (Verified) At The End With Detailed Information
100% Guaranteed Pass
Complete A+ Guide
Ascorers Stuvia
, MͅARKS DO NOT
SECTION 2 — 75 mͅarks
Attempt ALL questions
1. (a) The reaction of zinc with sulfuric acid, H2SO4(aq), is shown.
Zn(s) H2SO4(aq) ↓ ZnSO4(aq) H2(g)
(i) Hydrogen gas is produced in this reaction.
State the test, including the result, for hydrogen gas. 1
(ii) A student was asked to draw a diagram of the apparatus used to collect
and measure the volume of hydrogen gas produced during the reaction.
Their diagram is shown.
tub
water
sulfuric
acid
zinc
powder
Describe one way in which the student’s diagram is incorrect. 1
(iii) A solution of zinc(II) sulfate, ZnSO4(aq), is produced in this reaction.
Name the technique that could be used to obtain a dry sample of
zinc(II) sulfate, ZnSO4(s). 1
, MͅARKS DO NOT
WRITE IN
THIS
1. (continued) MͅARGIN
(b) The volume of hydrogen gas collected over time when zinc powder is added to
100 cm3 of dilute sulfuric acid was recorded.
A graph of the results is shown.
100
90
80
70
volumͅe of gas (cmͅ3)
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
time (s)
(i) Calculate the average rate of reaction, in cm3 s1, for the first 50 seconds. 2
Show your working clearly.
(ii) Add a curve to the graph to show the results that would be expected if
the experiment was repeated using the same mass of zinc lumps. 1
(An additional graph, if required, can be found on page 31.)
(iii) A similar experiment was carried out using the same mass of zinc powder
and the same volume and concentration of hydrochloric acid, HCl(aq), in
place of sulfuric acid, H2SO4(aq).
Predict the volume of gas, in cm3, produced in this reaction. 1
, MͅARKS DO NOT
WRITE IN
THIS
MͅARGIN
2. Oxygen is an odourless, colourless gas that is present in the Earth’s atmosphere.
(a) Draw a diagram, showing all the outer electrons, to represent a molecule of
oxygen, O2. 1
(b) Name an element that has similar chemical properties to oxygen. 1
(c) The graph shows the solubility of a compound containing oxygen at different
temperatures.
800
solubility of comͅpound (g/l)
700
600
500
400
300
200
100
0
0 10 20 30 40 50 60 70 80
temperature (°C)
State the relationship between temperature and the solubility of the
compound. 1
National 5 Chemistry 2025/26 Updated Questions & Answers
(Verified answers), 100% Guaranteed Pass ||Complete A+
Guide
This Document Contains:
75 National 5 Chemistry
Answer Sheet (Verified) At The End With Detailed Information
100% Guaranteed Pass
Complete A+ Guide
Ascorers Stuvia
, MͅARKS DO NOT
SECTION 2 — 75 mͅarks
Attempt ALL questions
1. (a) The reaction of zinc with sulfuric acid, H2SO4(aq), is shown.
Zn(s) H2SO4(aq) ↓ ZnSO4(aq) H2(g)
(i) Hydrogen gas is produced in this reaction.
State the test, including the result, for hydrogen gas. 1
(ii) A student was asked to draw a diagram of the apparatus used to collect
and measure the volume of hydrogen gas produced during the reaction.
Their diagram is shown.
tub
water
sulfuric
acid
zinc
powder
Describe one way in which the student’s diagram is incorrect. 1
(iii) A solution of zinc(II) sulfate, ZnSO4(aq), is produced in this reaction.
Name the technique that could be used to obtain a dry sample of
zinc(II) sulfate, ZnSO4(s). 1
, MͅARKS DO NOT
WRITE IN
THIS
1. (continued) MͅARGIN
(b) The volume of hydrogen gas collected over time when zinc powder is added to
100 cm3 of dilute sulfuric acid was recorded.
A graph of the results is shown.
100
90
80
70
volumͅe of gas (cmͅ3)
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
time (s)
(i) Calculate the average rate of reaction, in cm3 s1, for the first 50 seconds. 2
Show your working clearly.
(ii) Add a curve to the graph to show the results that would be expected if
the experiment was repeated using the same mass of zinc lumps. 1
(An additional graph, if required, can be found on page 31.)
(iii) A similar experiment was carried out using the same mass of zinc powder
and the same volume and concentration of hydrochloric acid, HCl(aq), in
place of sulfuric acid, H2SO4(aq).
Predict the volume of gas, in cm3, produced in this reaction. 1
, MͅARKS DO NOT
WRITE IN
THIS
MͅARGIN
2. Oxygen is an odourless, colourless gas that is present in the Earth’s atmosphere.
(a) Draw a diagram, showing all the outer electrons, to represent a molecule of
oxygen, O2. 1
(b) Name an element that has similar chemical properties to oxygen. 1
(c) The graph shows the solubility of a compound containing oxygen at different
temperatures.
800
solubility of comͅpound (g/l)
700
600
500
400
300
200
100
0
0 10 20 30 40 50 60 70 80
temperature (°C)
State the relationship between temperature and the solubility of the
compound. 1
