Prelim Past Questions
Prelim Past questions – Chemical Earth.
1.
What is the systematic name for a compound with the formula Cu2SO4?
(A)
(B)
(C)
(D)
3.
In which compound do all atoms have the same electronic configuration?
(A)
(B)
(C)
(D)
4.
Copper sulfide
Copper (I) sulfate
Copper (II) sulfate
Copper disulfate
LiF
NaCl
MgF2
NCl3
Identify the property which decreases across each row of the Periodic Table.
(A)
(B)
(C)
(D)
Melting point
Ionisation energy
Valency
Atomic radius
11. Which is correct in describing diamond, graphite and fullerenes?
(A)
(B)
(C)
(D)
13.
All have similar physical properties but different chemical compositions.
All have the same chemical composition but different physical properties. …show more content…
All have the same physical properties and chemical composition.
All have different physical properties and chemical compositions.
Identify the main reason for a change in reaction rate when temperature is increased. (A) Increasing the frequency of molecular collisions
(B) Decreasing the activation energy
(C) Increasing molecular kinetic energies
(D) Increasing the activation energy
2008
1.
Crystalline hematite is used as a gemstone and has the formula Fe2O3.
What is the systematic (IUPAC) name for this mineral?
(A)
(B)
(C)
(D)
2.
Listed below are the electronic energy levels for four different elements.
Which of these elements would form ions with a charge of –2?
(A)
(B)
(C)
(D)
5.
Li, Na, K
Mg2+, Ca2+, Sr2+
F-, Ne, Na+
O, F, Ne
Heating water to boil it simply separates its molecules BUT electrolysis separates its atoms to form the elements. Which statement best explains this difference?
(A)
(B)
(C)
(D)
8.
2, 2
2, 6
2, 8, 4
2, 8, 8
In which group do all the atoms have the same number of electrons?
(A)
(B)
(C)
(D)
7.
iron(II) oxide iron(III) oxide iron trioxide iron(II,III)oxide Water is ionic and the ions move to opposite electrodes.
Electrolysis provides much more energy per molecule than boiling.
The polar water molecules respond to the applied electric field.
Only electrolysis can break the hydrogen bonds in water.
Identify the compound which has a molecular formula different to its empirical formula. (A)
(B)
(C)
(D)
ammonia carbon dioxide ethane magnesium fluoride
Question 18 (3 marks) 08
Marks
The diagrams below show the structures of three different substances.
Substance I
Substance II
Substance III
Complete the last two columns of the table below to:
(a)
show which of the above substances has those properties.
1
(b)
identify an example of a substance matching those properties.
2
Melting
Point
Conductivity
Solid Molten
Effect of water High
0
high
0
0
none
Medium
high
high
Possible
Identity
dissolves
High
Substance
I, II or III
H2 gas
Question 21 (7 marks) 07
(a)
Compare the bonding within AND between water molecules in the liquid state.
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
4
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
Question 21 (continued)
(b)
Marks
(i) Relate the bonding in water to its ability to dissolve a large range of substances.
2
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
(ii) Account for the inability of water to dissolve hydrocarbons.
1
.............................................................................................................................................
.............................................................................................................................................
Question 21 (3 marks) 08
For the sequence of elements from nitrogen to silicon in the Periodic Table, describe the trend in each of the properties below:(a) 1st ionisation energy .......................................................................................................
1
.............................................................................................................................................
.............................................................................................................................................
(b) valency ...........................................................................................................................
1
.............................................................................................................................................
.............................................................................................................................................
(c) electrical conductivity ....................................................................................................
.............................................................................................................................................
1
2010
1
Which of the following correctly shows the most abundant element, by mass, in each region of Earth.
Lithosphere
Atmosphere
(A)
Oxygen
Hydrogen
Oxygen
(B)
Iron
Oxygen
Hydrogen
(C)
Aluminium
Water
Oxygen
(D)
2
Hydrosphere
Oxygen
Oxygen
Nitrogen
What is the correct formula for iron(III) sulfate?
(A) FeS3
(B)
Fe2(SO4)3
(C)
Fe3SO4
(D) Fe(SO4)3
4
Which of the following is an element that shows valencies of 3 and 5?
(A) Carbon
(B)
Sulfur
(C)
Phosphorus
(D) Oxygen
14
For each of the properties listed below, water has a high value compared with similar-sized molecules of other compounds.
Which of these properties is most important in providing a stable environment for aquatic organisms such as fish?
(A) Density
(B)
Boiling point
(C)
Surface tension
(D) Heat capacity
Question 24 (4 marks) 10
Marks
The table below applies to elements from the first four periods of the Periodic Table
(i.e. atomic numbers less than 37).
Complete the table below identifying ONE element (by name or symbol) which matches
EACH description.
Property
4
Element
Is the most reactive nonmetal
Consists of monatomic molecules Is a semi-metal
Has the highest ionisation energy
Question 29 (5 marks) 10
Marks
The table below shows some properties of diamond and graphite.
Property
Melting point (°C)
Electrical conductivity (MS m–1)
Hardness (Moh’s Scale)
(a)
Diamond
3730
10–17
10
Graphite
3550
0.07
1.5
Explain why some properties of diamond and graphite, such as melting point, are so similar, yet other properties, such as hardness and electrical conductivity, are so different. .............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
3
(b)
Describe ONE use of graphite AND relate this use to its physical properties.
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
2
1.
What is the systematic name for a compound with the formula Cu2SO4?
(A)
(B)
(C)
(D)
3.
In which compound do all atoms have the same electronic configuration?
(A)
(B)
(C)
(D)
4.
Copper sulfide
Copper (I) sulfate
Copper (II) sulfate
Copper disulfate
LiF
NaCl
MgF2
NCl3
Identify the property which decreases across each row of the Periodic Table.
(A)
(B)
(C)
(D)
Melting point
Ionisation energy
Valency
Atomic radius
11. Which is correct in describing diamond, graphite and fullerenes?
(A)
(B)
(C)
(D)
13.
All have similar physical properties but different chemical compositions.
All have the same chemical composition but different physical properties. …show more content…
All have the same physical properties and chemical composition.
All have different physical properties and chemical compositions.
Identify the main reason for a change in reaction rate when temperature is increased. (A) Increasing the frequency of molecular collisions
(B) Decreasing the activation energy
(C) Increasing molecular kinetic energies
(D) Increasing the activation energy
2008
1.
Crystalline hematite is used as a gemstone and has the formula Fe2O3.
What is the systematic (IUPAC) name for this mineral?
(A)
(B)
(C)
(D)
2.
Listed below are the electronic energy levels for four different elements.
Which of these elements would form ions with a charge of –2?
(A)
(B)
(C)
(D)
5.
Li, Na, K
Mg2+, Ca2+, Sr2+
F-, Ne, Na+
O, F, Ne
Heating water to boil it simply separates its molecules BUT electrolysis separates its atoms to form the elements. Which statement best explains this difference?
(A)
(B)
(C)
(D)
8.
2, 2
2, 6
2, 8, 4
2, 8, 8
In which group do all the atoms have the same number of electrons?
(A)
(B)
(C)
(D)
7.
iron(II) oxide iron(III) oxide iron trioxide iron(II,III)oxide Water is ionic and the ions move to opposite electrodes.
Electrolysis provides much more energy per molecule than boiling.
The polar water molecules respond to the applied electric field.
Only electrolysis can break the hydrogen bonds in water.
Identify the compound which has a molecular formula different to its empirical formula. (A)
(B)
(C)
(D)
ammonia carbon dioxide ethane magnesium fluoride
Question 18 (3 marks) 08
Marks
The diagrams below show the structures of three different substances.
Substance I
Substance II
Substance III
Complete the last two columns of the table below to:
(a)
show which of the above substances has those properties.
1
(b)
identify an example of a substance matching those properties.
2
Melting
Point
Conductivity
Solid Molten
Effect of water High
0
high
0
0
none
Medium
high
high
Possible
Identity
dissolves
High
Substance
I, II or III
H2 gas
Question 21 (7 marks) 07
(a)
Compare the bonding within AND between water molecules in the liquid state.
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
4
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
Question 21 (continued)
(b)
Marks
(i) Relate the bonding in water to its ability to dissolve a large range of substances.
2
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
(ii) Account for the inability of water to dissolve hydrocarbons.
1
.............................................................................................................................................
.............................................................................................................................................
Question 21 (3 marks) 08
For the sequence of elements from nitrogen to silicon in the Periodic Table, describe the trend in each of the properties below:(a) 1st ionisation energy .......................................................................................................
1
.............................................................................................................................................
.............................................................................................................................................
(b) valency ...........................................................................................................................
1
.............................................................................................................................................
.............................................................................................................................................
(c) electrical conductivity ....................................................................................................
.............................................................................................................................................
1
2010
1
Which of the following correctly shows the most abundant element, by mass, in each region of Earth.
Lithosphere
Atmosphere
(A)
Oxygen
Hydrogen
Oxygen
(B)
Iron
Oxygen
Hydrogen
(C)
Aluminium
Water
Oxygen
(D)
2
Hydrosphere
Oxygen
Oxygen
Nitrogen
What is the correct formula for iron(III) sulfate?
(A) FeS3
(B)
Fe2(SO4)3
(C)
Fe3SO4
(D) Fe(SO4)3
4
Which of the following is an element that shows valencies of 3 and 5?
(A) Carbon
(B)
Sulfur
(C)
Phosphorus
(D) Oxygen
14
For each of the properties listed below, water has a high value compared with similar-sized molecules of other compounds.
Which of these properties is most important in providing a stable environment for aquatic organisms such as fish?
(A) Density
(B)
Boiling point
(C)
Surface tension
(D) Heat capacity
Question 24 (4 marks) 10
Marks
The table below applies to elements from the first four periods of the Periodic Table
(i.e. atomic numbers less than 37).
Complete the table below identifying ONE element (by name or symbol) which matches
EACH description.
Property
4
Element
Is the most reactive nonmetal
Consists of monatomic molecules Is a semi-metal
Has the highest ionisation energy
Question 29 (5 marks) 10
Marks
The table below shows some properties of diamond and graphite.
Property
Melting point (°C)
Electrical conductivity (MS m–1)
Hardness (Moh’s Scale)
(a)
Diamond
3730
10–17
10
Graphite
3550
0.07
1.5
Explain why some properties of diamond and graphite, such as melting point, are so similar, yet other properties, such as hardness and electrical conductivity, are so different. .............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
3
(b)
Describe ONE use of graphite AND relate this use to its physical properties.
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
2