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Course: Alhussan Chemistry — Stage 9
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Alhussan Chemistry — Stage 9

Chapter 10: Structure, Bonding, and Properties

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Chapter 11: Patterns in the Periodic Table

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Chapter 12: Chemical Reactions 3 and Rates

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Chapter 13: Planet Earth and Continental Drift

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Quiz

Chemistry 10.6 Covalent structures — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
Hardness (Mohs scale). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 1
A
B
C
D
2.
Which is a giant covalent structure?
Methane
Water
Diamond
Oxygen
3.
Which term matches this definition? “Sheets of atoms in graphite.”
Element
Layers
Proton number
Intermolecular forces
4.
Diamond is used in cutting ____.
lubricants
food
tools
wires
5.
True or false? Graphite layers cannot slide.
True
False
6.
Diamond ____ conduct electricity.
does
always
does not
sometimes
7.
Which term matches this definition? “Giant covalent carbon; each atom bonded to four others.”
Magnesium ion
Silica
Diamond
Moseley
8.
True or false? Melting diamond requires breaking covalent bonds.
True
False
9.
Melting points of substances (°C). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 2
A
B
C
D
10.
Electrical conductivity (relative). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 3
A
B
C
D
11.
Diamond is very ____.
soft
hard
light
conductive
12.
Hardness (Mohs scale). Which has the greatest value?
Dr Dabour Hub Academy - figure 4
Graphite
Salt
Quartz
Diamond
13.
True or false? Simple molecular substances have low melting points.
True
False
14.
True or false? Melting ice breaks covalent bonds.
True
False
15.
Hardness (Mohs scale). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 5
A
B
C
D
16.
Hardness (Mohs scale). About how many times bigger is Diamond than Graphite?
Dr Dabour Hub Academy - figure 6
6.7
10.0
13.3
3.3
17.
Which term matches this definition? “Small group of covalently bonded atoms.”
Diatomic molecule
Simple molecule
Group number
Atomic number
18.
Diamond density is 3.5 g/cm³. Volume of a 0.7 g diamond?
2.45 cm³
5.00 cm³
0.20 cm³
−2.80 cm³
19.
Pencil "lead" is ____.
silicon
diamond
lead
graphite
20.
True or false? Pencil "lead" is graphite.
True
False
21.
Hardness (Mohs scale). What is the value for Graphite?
Dr Dabour Hub Academy - figure 7
10.0
2.5
1.5
7.0
22.
Melting points of substances (°C). Which has the smallest value?
Dr Dabour Hub Academy - figure 8
Sodium chloride
Iodine
Water
Methane
23.
A 1.0 g pencil core is 70% graphite. Mass of graphite?
1.00 g
0.30 g
0.70 g
1.43 g
24.
Which statement is NOT correct?
Simple molecular substances have low melting points.
Water, CO2, nitrogen and iodine are simple molecular.
Diamond conducts electricity.
Silica (sand) is giant covalent.
25.
Hardness (Mohs scale). About how many times bigger is Diamond than Graphite?
Dr Dabour Hub Academy - figure 9
3.4
13.6
10.2
6.8
26.
Melting points of substances (°C). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 10
A
B
C
D
27.
Hardness (Mohs scale). What is the total of all the values?
Dr Dabour Hub Academy - figure 11
11.6
20.6
27.4
24.0
28.
True or false? Pencil lead contains lead.
True
False
29.
Which statement is correct?
Water, CO2, nitrogen and iodine are simple molecular.
Melting ice breaks covalent bonds.
Diamond conducts electricity.
Graphite layers cannot slide.
30.
Boiling point rose from -196 °C to 100 °C. Difference?
100°C
−296°C
296°C
−96°C
31.
True or false? Diamond melts at about 3550 °C.
True
False
32.
Diamond density is 3.5 g/cm³. Volume of a 1.4 g diamond?
4.90 cm³
2.50 cm³
0.40 cm³
−2.10 cm³
33.
Electrical conductivity (relative). What is the total of all the values?
Dr Dabour Hub Academy - figure 12
130
144
100
116
34.
Which statement is NOT correct?
Silica (sand) is giant covalent.
Simple molecular substances have low melting points.
Melting diamond requires breaking covalent bonds.
Diamond has weak bonds.
35.
Which statement is correct?
Silica is simple molecular.
Simple molecules have high melting points.
Pencil lead contains lead.
Graphite conducts because it has delocalised electrons.
36.
N2 has ____ shared pairs.
two
one
three
four
37.
Electrical conductivity (relative). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 13
A
B
C
D
38.
Which is the correct definition of “Graphite”?
Giant covalent carbon in layers; conducts.
Arranged elements by atomic mass and left gaps.
Holds up to 2 electrons.
Free electron that lets graphite conduct.
39.
Hardness (Mohs scale). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 14
A
B
C
D
40.
Boiling points of simple molecular substances (°C). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 15
A
B
C
D
41.
Hardness (Mohs scale). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 16
A
B
C
D
42.
Boiling points of simple molecular substances (°C). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 17
A
B
C
D
43.
True or false? Forces between simple molecules are weak.
True
False
44.
True or false? Silica (sand) is giant covalent.
True
False
45.
Electrical conductivity (relative). Which has the smallest value?
Dr Dabour Hub Academy - figure 18
Iodine
Diamond
Graphite
Copper
46.
Graphite layers can ____.
not move
melt easily
dissolve
slide
47.
Which is the correct definition of “Delocalised electron”?
Stable arrangement, e.g. 8 electrons.
Na⁺, formed by losing one electron.
Free electron that lets graphite conduct.
Huge network of covalent bonds, e.g. diamond.
48.
Which statement is correct?
Graphite layers cannot slide.
Simple molecular substances do not conduct.
Graphite is very hard.
Diamond conducts electricity.
49.
Which statement is correct?
Melting ice breaks covalent bonds.
Silica (sand) is giant covalent.
Iodine is ionic.
Diamond carbons bond to three others.
50.
Which is the correct definition of “Layers”?
Regular 3D arrangement of ions.
Substance used to treat illness.
Sheets of atoms in graphite.
Number of outer electrons.
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