Chemical Bonding Past paper Grade 9
IONIC
BOND AND COVALENT BOND
1. The
electronic structures of two atoms, P and Q, are shown.
P and Q combine together
to form a compound.
What is the type of
bonding in the compound and what is the formula of the compound ?
2. Sodium
reacts with chlorine to form sodium chloride.
Which row describes the
bonding in the three substances?
3. A
covalent molecules Q contains only six shared electrons.
what is Q ?
A. Ammonia
,NH3
B. Chlorine,
Cl2
C. Methane,
CH4
D. Water,
H2O
4. The
arrangement of particles in each of two solids, S and T, are shown.
What are S and T ?
5. Which
diagram shows the outer electron arrangement in a molecules of carbon dioxide ?
6. Chemical
compounds formed a group 1 element and a group VII element contain ionic bonds.
How are the ionic bonds
formed?
A. Electrons
are transferred from group VII atoms to group I atoms
B. Electrons
are shared between group I atoms and group VII atoms
C. Electrons
are lost by group I atoms and group VII atoms
D. Electrons are transferred fropm group I atoms to group VII atoms
7. What
is total number of shared electrons in a molecule of methanol, CH3OH?
A. 4
B. 5
C. 8
D. 10
8. Which
statements about potassium bromide are correct ?
1. It
has a high melting point
2. It
dissolves in water
3. It
conducts electricity when solid
A. 1
and 2
B. 1
and 3
C. 2
and 3
D. 3
only
9. Which
statement about solid magnesium oxide is correct?
A. It
is a giant structure made up of magnesium and oxygen atoms bonded covalently
B. It
is an electrical conductor with mobile magnesium ions and oxygen ions
C. Magnesium
loses electrons and these electrons move freely through a lattice
D. Oxygen
ions and magnesium ions are attracted to ecah other in a giant lattice.
10. The
diagram show the structures of three macromolecules P,Q and R.
What are P, Q and R?
QUESTION STRUCTURE
1. The
following table gives information about six substances
a. Which
substance could be a metal?
__________________________________________________________________
b. State
all the substance that are liquid at room temperature ?
___________________________________________________________________
c. Which
substance could have a macromolecules structure similar to that of silicon (IV)
oxide ?
___________________________________________________________________
d. Which
substance could be sodium chloride ?
___________________________________________________________________
2. The
table below shows the sub-atomic particles in atom X and atom Y.
|
Atom |
Sub-atomic particles |
||
|
Proton |
Neutron |
Electron |
|
|
X |
13 |
14 |
13 |
|
Y |
9 |
10 |
9 |
a. (i)
give the electronic configuration
of atom X and atom Y
___________________________________________________________________
(ii) How can atom X achieve a noble gas
configuration?
___________________________________________________________________
(iii) How can atom Y achieve a noble gas
configuration?
___________________________________________________________________
b. Atom
X and Y react to form a compound.
(i)
Explain how atoms X and Y bond with each
other in the compound.
_____________________________________________________________
(ii)
Draw a ‘dot and cross’ diagram to show the
bonding in the compound.
_____________________________________________________________
(iii)
What type of structure is present in the
compound?
_____________________________________________________________
3. Ethanol
is an organic compound found in alcoholic drinks. The bonding in the ethanol
molecules is shown in figure 6.12
(a) (i)
How many elements are there in
ethanol?
_____________________________________________________________
(ii) Name the elements present in ethanol.
_____________________________________________________________
(b) (i)
Give the number of atom of each
element in ethanol.
_____________________________________________________________
(ii) How many atoms are there in one molecule
of ethanol?
_____________________________________________________________
(iii) Write down the molecular formula of the
ethanol molecule
_____________________________________________________________
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