Download National 5 Chemistry Prelim Revision 1

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N5
National 5 Chemistry
Prelim Revision 1
Unit 1: Chemical Changes and Structure
Unit 2: Nature’s Chemistry
Unit 3: Chemistry in Society (Polymers)
UNIT 1 Chemical Changes and Structure
Multiple Choice
1.
4.
An atom has atomic number 23 and mass number 51.
Different isotopes of the same element have
The number of electrons in the atom is
identical
A
23
A
nuclei
B
28
B
mass numbers
C
51
C
number of neutrons
D
74
D
number of protons
2.
The gram formula mass of sodium carbonate is 106g.
How many moles are present in 5.3g of sodium
carbonate?
A
0.05
B
0.5
C
2
D
20
5.
Which substance exists as diatomic molecules?
A
Sodium chloride
B
Nitrogen monoxide
C
Silicon tetrachloride
D
Sulphur dioxide
6. The graph below shows the variation of concentration
of a reactant with time as a reaction proceeds.
3.
Which statement describes an exothermic reaction?
A
Energy is taken in from the surroundings and
the products have more chemical energy
than the reactants
B
Energy is taken in from the surroundings and
the products have less chemical energy
than the reactants
C
Energy is released to the surroundings and
During the first 20s, the average reaction rate, in
mol
, is
the products have more chemical energy
A
0.0125
Energy is released to the surroundings and
B
0.0180
the products have less chemical energy
C
0.0375
than the reactants
D
0.0450
than the reactants
D
UNIT 2 Nature’s Chemistry
7.
Which of the following elements exists as a covalent
network?
A
B
C
D
Helium
Nitrogen
Silicon
Sulfur
Multiple Choice
11.
A compound has a relative formula mass of 30 and
contains only carbon and hydrogen.
Which statement about the compound is true?
8.
When solid sodium chloride dissolves in water, a solution
containing sodium ions and chloride ions is formed.
Which of the following equations correctly shows the
state symbols for this process?
NaCl(s) + H2O(l)
Na+(l) + Cl-(l)
NaCl(s) + H2O(l)
Na+(aq) + Cl-(aq)
NaCl(s) + H2O(aq)
Na+(aq) + Cl-(aq)
NaCl(aq) + H2O(l)
Na+(aq) + Cl-(aq)
A
B
C
D
A
It is a gas
B
It has a high viscosity
C
It undergoes addition polymerisation
D
It decolourises bromine water immediately
12.
9.
The name of the above compound is
Which oxide, when shaken with water, would leave
the pH unchanged?
A
but-2-ene
A
Calcium oxide
B
pent-2-ene
B
Carbon dioxide
C
but-3-ene
C
Sulphur dioxide
D
pent-3-ene
D
Zinc oxide
10.
13.
Which type of reaction is represented by the
equation?
Catalyst
Which of the following is the electron arrangement
for a halogen atom?
C2H4
+
A
2,4
A
Addition
B
2,5
B
Hydrolysis
C
2,6
C
Dehydration
D
2,7
D
Condensation
H2O
C2H5OH
14.
16.
The molecular formula for cyclopentane is
Fractional distillation of crude oil produces a number
of different fractions.
A
C5H5
B
C5H9
Which of the following properties apply to a fraction
containing large hydrocarbon molecules?
C
C5H10
A
High viscosity and low flammability
D
C5H12
B
Low viscosity and low flammability
C
High viscosity and high flammability
D
Low viscosity and high flammability
15.
Which structural formula represents an alkanoic
acid (carboxylic acid)
17.
The method used to increase the ethanol concentration
of fermentation products is
A
addition
B
cracking
C
distillation
D
hydrolysis
18.
What name is given to the reaction shown by the
following equation?
C6H12O6 + 6O2
A
combustion
B
condensation
C
dehydration
D
hydrolysis
6CO2 + 6H2O
Unit 3 Chemistry in Society
Polymers - Multiple Choice
19.
The fractional distillation of crude oil depends on
the fact that different hydrocarbons have different
A
densities
B
solubilities
C
boiling points
D
ignition temperatures
20.
Which of the following compounds belongs to the
same homologous series as the compound with the
molecular formula C3H8?
21.
Which of the following plastics could be used to make
a soluble coating for a dishwasher tablet?
A
PVC
B
Biopol
C
Polystyrene
D
Poly(ethenol)
22.
Polyethene terephthalate(PET) is used to make
plastic bottles which can easily be recycled by
heating and reshaping.
A section of the PET structure is shown.
Which
line
in in
thethe
table
best
describes
Which
line
table
best
describes PET
PET?
A
B
C
D
Type of
polymer
Addition
Condensation
addition
Condensation
Property
thermoplastic
Thermosetting
Thermosetting
thermoplastic
Written
(3)
2.
(3)
3.
(5)
4.
(3)
5.
1
(ii) Another homologous series are the alcohols. Draw the shortened structural
formula of ethanol.
1
(4)