National 5 Chemistry
Exam Revision
Chemical Changes
Reaction Rates
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
Volume
CO2/cm3
0
10
30
40
50
60
70
0
10
25
32
41
49
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?
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.
Atomic Structure & Bonding
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.
B.
C.
D.
W and X
W and Y
X and Y
Y and Z
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 37. The
relative atomic mass of chlorine is 35.5.
Which isotope of chlorine is most abundant in the
sample?
Find the number of protons, neutrons and electrons
in each of the following;
1.
2.
3.
4.
Solid ionic compounds do not
conduct electricity because;
Which substance exists
as diatomic molecules
A. The ions are not free to
move
B. The electrons are not free
to move
C. Solid substances never
conduct electricity
D. There are no charged
particles in ionic
compounds
A.
B.
C.
D.
Sodium chloride
Nitrogen monoxide
Silicon tetrachloride
Sulfur dioxide
Draw a diagram to show how the outer electrons
are shared in a molecule of;
1.
2.
3.
4.
5.
Hydrogen chloride
Hydrogen sulfide
Nitrogen fluoride
Water
Methane
Which of the following diagrams could be used to
represent the structure of a covalent network?
The table gives information about some substances.
(a)
(b)
(c)
(d)
Substance
Melting
point/0C
Boiling
point/ 0C
Conduction as
A solid
A liquid
Yes
Yes
A
1890
3380
B
C
D
E
963
1455
-183
1700
1560
2730
-164
2230
No
Yes
No
No
Yes
Yes
No
No
F
712
1418
No
Yes
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)
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
A.
B.
C.
D.
Ionic
Metallic
Covalent network
Covalent molecular
Formula and reactant
quantities
Write the chemical formula for;
1.
2.
3.
4.
5.
6.
Sodium fluoride
Magnesium carbide
Calcium carbonate
Potassium permanganate
Cobalt (II) chloride
Ammonium nitrate
Write the ionic formula for;
1.
2.
3.
4.
5.
6.
Lithium iodide
Magnesium oxide
Copper (II) carbonate
Calcium sulphite
Beryllium hydroxide
Ammonium phosphate
What is the charge on
the chloride ion in
SnCl4?
In vanadium oxide,
VaO2, what is the
valency of vanadium?
A 1+
B 1–
C 4+
D 4–
A
B
C
D
1
2
3
4
Acids & Alkalis
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?
A. Silver (I) nitrate +
sodium chloride
B. Copper (II) sulphate +
sodium nitrate
C. Magnesium chloride +
lithium nitrate
D. Barium chloride +
potassium nitrate
When barium nitrate
solution is mixed with
sodium sulphate solution,
the name of the precipitate
formed is
a.
b.
c.
d.
barium chloride
barium sulphate
sodium chloride
sodium nitrate
Which of the following
oxides would dissolve in
water to produce an
acidic solution?
(You may wish to
consult your data
booklet)
A.
B.
C.
D.
sulphur dioxide
iron (III) oxide
copper (II) oxide
sodium oxide
Which of the following
gases would dissolve in
water to produce an
alkaline solution?
A.
B.
C.
D.
Carbon dioxide
Nitrogen dioxide
Ammonia
Methane
Which of the following
is not a salt?
A. Sodium chloride
B. Lithium sulphate
C. Potassium hydroxide
D. Copper (II) nitrate
Which of the following
reactions would not
result in the formation of
a salt?
A. Acid + alkali
B. Acid + reactive metal
C. Acid + alcohol
D. Acid + carbonate
Name the product (s) of the following neutralisation
reactions;
a.
b.
c.
d.
e.
Magnesium and hydrochloric acid
Potassium hydroxide and sulfuric acid
Magnesium carbonate and hydrochloric acid
Calcium carbonate and nitric acid
Ammonia and sulfuric acid
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?
A. The concentration of H+ (aq) and OH- (aq)ions
are zero.
B. The concentration of H+ (aq) and OH- (aq)ions
are equal.
C. The concentration of H+ (aq) is higher than OH(aq) ions.
D. The concentration of H+ (aq) is lower than OH(aq) ions.
Which line in the table correctly describes what
happens to a dilute solution of hydrochloric acid
when water is added to it?