04-05 Chemical Bonding and Materials, Set A To print: Ctrl + P, paper A4, margins Default.
Learners' AlleyDesigned by Khow Willard
04-05
Chemical Bonding and Materials
Set AFoundations
Name
Time 1 hour
Total 36 marks
Use a copy of the Periodic Table where you need one.
A
From the lesson
8 marks
1
What type of bonding holds magnesium and oxygen together in magnesium oxide?
Acovalent bonding
Bionic bonding
Cmetallic bonding
Dintermolecular forces
Answer [1]
Source: Learners' Alley, Chemical Bonding and Materials slides
2
Which substance conducts electricity in the solid state?
Asodium chloride
Bgraphite
Cdiamond
Diodine
Answer [1]
Source: Learners' Alley, Chemical Bonding and Materials slides
3
Why is diamond very hard?
AIts atoms are held together by weak forces.
BEach carbon atom is bonded to four others by strong covalent bonds.
CIt has a sea of delocalised electrons.
DIt contains positive and negative ions.
Answer [1]
Source: Learners' Alley, Chemical Bonding and Materials slides
4
How many pairs of electrons are shared between the two atoms in an oxygen molecule, O2?
A1
B2
C3
D4
Answer [1]
Source: Learners' Alley, Chemical Bonding and Materials slides
5
A sodium atom has the electronic configuration 2.8.1 and a chlorine atom has the electronic configuration 2.8.7. They react to form sodium chloride.
(a)
Describe what happens to the electrons when sodium reacts with chlorine.
[2]
(b)
Name the type of bond in sodium chloride and explain how it holds the ions together.
[2]
Source: Learners' Alley, Chemical Bonding and Materials slides
B
Practice
28 marks
6
Which of the following pairs of elements forms covalent bonds?
Abromine and calcium
Bphosphorus and oxygen
Cstrontium and sulfur
Dzinc and chlorine
Answer [1]
Source: 2023 GESS Sec 3 End-of-Year P1 Q13
7
Which of the following correctly describes metallic bonding?
Aelectrostatic forces of attraction between positive metal ions surrounded by a ‘sea of delocalised electrons’
Belectrostatic forces of attraction between negative metal ions surrounded by a ‘sea of delocalised electrons’
Cintermolecular forces of attraction between positive metal ions surrounded by a ‘sea of delocalised electrons’
Dintermolecular forces of attraction between negative metal ions surrounded by a ‘sea of delocalised electrons’
Answer [1]
Source: 2023 GESS Sec 3 End-of-Year P1 Q14
8
Copper is used in electrical wiring to conduct electricity. Why is copper able to conduct electricity?
ACopper has a ‘sea’ of delocalised electrons.
BCopper has free-moving ions.
CCopper has a ‘sea’ of delocalised ions.
DCopper has free-moving atoms.
Answer [1]
Source: 2022 XMS Sec 3 WA2 Q1
9
Calcium phosphate is the main mineral found in human bones and teeth. What is the chemical formula of calcium phosphate?
ACaPO3
BCaPO4
CCa3(PO3)2
DCa3(PO4)2
Answer [1]
Source: 2022 XMS Sec 3 WA2 Q2
10
A solid substance was found to be unable to conduct electricity. When pure water was used to dissolve the substance, the solution could conduct electricity. What could be the structure of the substance, and why can the solution conduct electricity?
structure
reason for being able to conduct electricity
A
giant metallic structure
Water can conduct electricity.
B
giant metallic structure
It has free-moving electrons.
C
giant ionic structure
It has free-moving ions.
D
giant ionic structure
Water can conduct electricity.
Answer [1]
Source: 2022 XMS Sec 3 WA2 Q4
11
Which of the following groups consists of a metallic element, an ionic compound and a gaseous mixture?
Abronze, sodium chloride, sea water
Bair, tungsten, sodium bromide
Csodium, bronze, air
Dsilicon, aluminium oxide, sea water
Answer [1]
Source: 2020 XMS Sec 3 WA1 P1 Q3
12
Which diagram represents a chemical change?
AA
BB
CC
DD
Answer [1]
Source: 2024 CHS Sec 3 End-of-Year Section A Q4
13
The diagram shows the structure of an alloy.
Which statement about alloys is correct?
AAlloys can only be formed by a metal with other metals.
BHigh carbon steel alloys are soft and easily shaped.
CIn an alloy there is attraction between positive ions and a ‘sea of delocalised electrons’.
DThe alloy brass has a chemical formula.
Answer [1]
Source: Broadrick Sec 4 Prelim P1 Q32
14
Use this list of substances to answer the questions: sulfur dioxide, graphite, oxygen, sodium sulfate, dry ice.
(a)
(i)
Which substance is ionic?
[1]
(ii)
Which substance has a giant molecular structure?
[1]
(iii)
Which two substances contain two elements from Group 16?
[1]
(iv)
If the substances were mixed, which substance can be obtained by sublimation?
[1]
(v)
Which substance can conduct electricity in the solid state?
[1]
(vi)
Write down the chemical formula for one of the compounds.
[1]
(b)
Draw the dot-and-cross diagram for ammonia. Show outer electrons only.
[2]
Source: 2022 XMS Sec 3 WA2 B1, adapted
15
Scandium is a metallic element with the symbol Sc and atomic number 21.
(a)
Describe the structure of a piece of scandium.
[2]
(b)
Scandium oxide has the chemical formula Sc2O3. Write the chemical formula of
(i)
scandium sulfate
[1]
(ii)
scandium hydroxide
[1]
Source: 2023 XMS Sec 3 WA2 Q7
16
The table shows some information about the properties of compounds Li2O and CH4.
compound
melting point / °C
boiling point / °C
solubility in water
electrical conductivity at room temperature and pressure
Li2O
1438
2600
soluble
poor
CH4
−182
−162
insoluble
poor
(a)
Draw a dot-and-cross diagram for Li2O. Show outer electrons only.
[2]
(b)
What are the physical states of Li2O and CH4 at room temperature and pressure?
[2]
(c)
Explain, in terms of structure and bonding, why
(i)
Li2O is unable to conduct electricity at room temperature and pressure.
[2]
(ii)
CH4 has a low melting point and a low boiling point.