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Essential Chemistry for IGCSE - Structure And Bonding (Section 3)

1
Which of the following is NOT a property of ionic compounds?
Answer
(C)
Conduct electricity when solid
2
What type of bond would form between sodium and chlorine atoms?
Answer
(C)
Ionic
3
In a double covalent bond, how many pairs of electrons are shared?
Answer
(B)
Two
4
Which of the following is a property of a substance with a giant covalent structure?
Answer
(C)
Very hard.
5
Which element, when it gains an electron, will achieve the electronic structure of argon?
Answer
(B)
Chlorine
6
In the formation of magnesium oxide, what is the charge on the magnesium ion?
Answer
(C)
+2
7
What type of forces are present between the molecules of a simple covalent compound?
Answer
(C)
Intermolecular forces
8
In the formation of NaCl, what happens to the electrons?
Answer
(A)
Sodium loses one electron to chlorine.
9
Which of the following factors contribute to the high melting points of ionic compounds?
Answer
B
C
10
What is formed when electrons are shared between atoms?
Answer
(C)
A covalent bond
11
What is the electronic configuration of an oxygen atom?
Answer
(A)
2, 6
12
Which of the following is NOT a property of diamond?
Answer
(C)
Good conductor of electricity
13
Why does silicon dioxide (SiO2) have a high melting point?
Answer
(B)
Because it has a giant covalent structure with strong bonds.
14
What is the number of valence electrons in chlorine?
Answer
(B)
7
15
What holds the atoms together in a giant covalent structure?
Answer
(D)
Strong covalent bonds
16
What type of bonding and structure is present in carbon dioxide (CO2)?
Answer
(B)
Covalent bonding, simple molecular structure.
17
What is the shape of the bonds formed around a carbon atom in diamond?
Answer
(D)
Tetrahedral
18
What type of bond is found in a molecule of hydrogen chloride (HCl)?
Answer
(B)
Covalent
19
What is the electronic structure of chlorine?
Answer
(D)
2, 8, 7
20
Which of the following pairs of elements would most likely form an ionic bond?
Answer
(C)
Sodium and Chlorine
21
Which statement best describes the structure of a diamond?
Answer
(A)
It has a giant covalent structure.
22
Which statements correctly describe graphite?
Answer
A
B
23
Which of the following elements is most likely to form a covalent bond?
Answer
(B)
Chlorine
24
Why are metals able to conduct electricity?
Answer
(A)
Because they have delocalized electrons.
25
In graphite, what are the layers of carbon atoms held together by?
Answer
(D)
Weak intermolecular forces
26
Which of the following is a property of silicon dioxide?
Answer
(C)
It is a giant covalent structure.
27
What is the main type of force overcome when melting a covalent molecular substance?
Answer
(D)
Intermolecular forces
28
Which of the following is the correct description of a covalent bond?
Answer
(B)
The sharing of electrons between two atoms.
29
What is the formula of water?
Answer
(B)
H2O
30
What is a property of a simple molecular substance?
Answer
(B)
Low melting and boiling points
31
Which of the following are examples of giant covalent structures?
Answer
A
B
C
32
What is the electronic structure of chlorine?
Answer
(A)
2,8,7
33
What are the forces that exist between simple molecules?
Answer
(C)
Intermolecular forces
34
Which of the following is/are a characteristic of substances with low melting points?
Answer
B
C
35
Which statements correctly describe ionic compounds?
Answer
A
C
36
What type of bond is formed between a metal and a non-metal?
Answer
(C)
Ionic
37
Which of the following is an example of a simple covalent molecule?
Answer
(C)
Methane
38
Which of the following is a use of graphite?
Answer
(A)
As a lubricant
39
What is the electronic structure of sodium?
Answer
(B)
2, 8, 1
40
Which of the following is NOT a property of giant covalent structures?
Answer
(C)
Good conductors of electricity
41
Which of the following statements best describes the conductivity of electricity in graphite?
Answer
(C)
Graphite conducts electricity because of delocalized electrons that can move freely.
42
What is the main difference in structure between diamond and graphite?
Answer
(B)
Graphite has delocalized electrons, while diamond does not.
43
Which statement best describes the type of bond found within a molecule of hydrogen?
Answer
(B)
Covalent
44
What is the correct formula for sodium chloride?
Answer
(C)
NaCl
45
Why does graphite conduct electricity?
Answer
(B)
It has delocalized electrons that can move freely.
46
What is the formula for silicon dioxide?
Answer
(B)
SiO2
47
In an ionic compound, what happens to the outer shell of an atom when it forms an ion?
Answer
(B)
It loses electrons, exposing the previous full shell.
48
Which of the following statements about giant covalent structures is/are correct?
Answer
A
D
49
In a covalent bond, what is the relationship between the electrons and the atomic nuclei?
Answer
(B)
Electrons are shared between the nuclei.
50
Which of the following statements are true about the melting and boiling points of ionic compounds?
Answer
A
D