1. National 5 Chemistry Exam Revision
Chemical Changes

2. Reaction Rates

3. 1. A student investigated the reaction between dilute hydrochloric acid and sodium carbonate. One experiment involved measuring the volume of carbon dioxide produced when solid sodium carbonate was used.
Time/s 10 30 40 50 60 70
Volume
CO2/cm3 25 32 41 49
a) Calculate the average rate in cm3/s of carbon dioxide produced between 10 and 40 seconds.
b) Calculate the average rate in cm3/s of carbon dioxide produced in the first 40seconds.
c) When did the reaction finish?

5. Copy and complete the diagram to show how the carbon dioxide gas could be collected from the reaction of calcium carbonate chips and sulphuric acid.

6. Atomic Structure & Bonding

7. The table shows the numbers of protons, electrons and neutrons in four particles, W, X, Y and Z.
Which pair of particles are isotopes?
A. W and X
B. W and Y
C. X and Y
D. Y and Z

8. Bromine has two isotopes
Bromine has two isotopes. One has a mass number of 81 and the other has a mass number of 79. The relative atomic mass of bromine is 80. What does this tell you about the percentage of each isotope in bromine?
Chlorine has two isotopes. One has a mass number of 35 and the other has a mass number of The relative atomic mass of chlorine is 35.5.
Which isotope of chlorine is most abundant in the sample?

9. Find the number of protons, neutrons and electrons in each of the following; 1. 2. 3. 4.

10. Solid ionic compounds do not conduct electricity because;
The ions are not free to move
The electrons are not free to move
Solid substances never conduct electricity
There are no charged particles in ionic compounds
Which substance exists as diatomic molecules
Sodium chloride
Nitrogen monoxide
Silicon tetrachloride
Sulfur dioxide

11. Draw a diagram to show how the outer electrons are shared in a molecule of;
Hydrogen chloride
Hydrogen sulfide
Nitrogen fluoride
Water
Methane

12. Which of the following diagrams could be used to represent the structure of a covalent network?

13. The table gives information about some substances.
Melting point/0C
Boiling point/ 0C
Conduction as
A solid
A liquid A
1890
3380
Yes B
963
1560 No C
1455
2730 D
-183
-164 E
1700
2230 F
712
1418
Identify the two ionic compounds.
Identify the covalent network
Identify the covalent molecular compound
Identify the substance which is a gas at room temperature (210C)

14. A substance X, has a melting point of 996⁰C and a boiling point of 1704⁰C. It only conducts electricity when molten or when dissolved in water.
The structure of X is likely to be
Ionic
Metallic
Covalent network
Covalent molecular

15. Formula and reactant quantities

16. Write the chemical formula for;
Sodium fluoride
Magnesium carbide
Calcium carbonate
Potassium permanganate
Cobalt (II) chloride
Ammonium nitrate

17. Write the ionic formula for;
Lithium iodide
Magnesium oxide
Copper (II) carbonate
Calcium sulphite
Beryllium hydroxide
Ammonium phosphate

18. What is the charge on the chloride ion in SnCl4? A 1+ B 1– C 4+ D 4–
In vanadium oxide, VaO2, what is the valency of vanadium? A 1 B 2 C 3 D 4

19. Acids & Alkalis

21. Precipitation is when two solutions react to form an insoluble product
Precipitation is when two solutions react to form an insoluble product. Which of the following pairs of solutions would react together to produce a precipitate?
Silver (I) nitrate + sodium chloride
Copper (II) sulphate + sodium nitrate
Magnesium chloride + lithium nitrate
Barium chloride + potassium nitrate
When barium nitrate solution is mixed with sodium sulphate solution, the name of the precipitate formed is
barium chloride
barium sulphate
sodium chloride
sodium nitrate

22. Which of the following oxides would dissolve in water to produce an acidic solution?
(You may wish to consult your data booklet)
sulphur dioxide
iron (III) oxide
copper (II) oxide
sodium oxide
Which of the following gases would dissolve in water to produce an alkaline solution?
Carbon dioxide
Nitrogen dioxide
Ammonia
Methane

23. Which of the following reactions would not result in the formation of a salt?
Acid + alkali
Acid + reactive metal
Acid + alcohol
Acid + carbonate
Which of the following is not a salt?
Sodium chloride
Lithium sulphate
Potassium hydroxide
Copper (II) nitrate

24. Name the product (s) of the following neutralisation reactions;
Magnesium and hydrochloric acid
Potassium hydroxide and sulfuric acid
Magnesium carbonate and hydrochloric acid
Calcium carbonate and nitric acid
Ammonia and sulfuric acid

25. Which of the following statements correctly describes the concentration of H+ (aq) and OH- (aq) ions in an acidic substance when compared to pure water?
The concentration of H+ (aq) and OH- (aq)ions are zero.
The concentration of H+ (aq) and OH- (aq)ions are equal.
The concentration of H+ (aq) is higher than OH-(aq) ions.
The concentration of H+ (aq) is lower than OH- (aq) ions.

26. Which line in the table correctly describes what happens to a dilute solution of hydrochloric acid when water is added to it?