HW Unit 1.2 drug haul-bonding
1. Predict the type of bonding / structure that will exist in the following substances. You
should choose from the following
METALLIC; COVALENT NETWORK; COVALENT MOLECULAR; IONIC
a) substance W, has a high melting point, does not conduct
electricity when solid, but does when dissolved in water
b) substance X, has a very high melting point and never
conducts electricity.
c) substance Y, has low melting and boiling points, it is a gas
at room temperature
d) substance Z, has a high melting point, it is a shiny solid and
conducts electricity when solid or liquid.
2. The table below gives the names of some elements:
A
B
ARGON
D
C
SULPHUR
SODIUM
E
POTASSIUM
F
ALUMINIUM
FLUORINE
Which two boxes show elements that
form a compound with the formula X2Y3?(X is a metal and Y is
a non - metal)
3. The table shows some ions
A
37
B
Cl –
D
17
39
F
19
F–
9
16
K+
19
O2–
8
Which box or boxes show
a) an ion with the same electron arrangement as argon?
C
23
Na+
11
4. The grid below gives the name and chemical formula for some common substances found
in the laboratory,
A
B
C
COPPER
WATER
SULPHUR
Cu
H2O
D
S
E
F
SODIUM CHLORIDE
CARBON DIOXIDE
CALCIUM FLUORIDE
NaCl
CO2
CaF2
Which box or boxes shows
a) a compound composed of molecules?
b) a substance that conducts electricity only when molten or when
dissolved in water?
5. The table below gives information on the melting and boiling points of six substances A to
F.
(Take room temperature to be 20 °C)
SUBSTANCE
A
B
C
D
E
F
MELTING POINT / °C
350
-120
5
670
-56
-242
BOILING POINT / °C
600
-60
115
900
132
-230
Which substance or substances is
a) a liquid at room temperature?
6. The following table gives the structures/bonding present in elements
A
B
C
MONATOMIC GAS
COVALENT MOLECULAR
COVALENT
DIATOMIC GAS
MOLECULAR SOLID
D
E
METAL
COVALENT NETWORK
SOLID
a) The structure / bonding present in chlorine
b) The structure / bonding present in silicon
c) The structure / bonding present in lithium
7. What shape is an ammonia, NH3 molecule?
8. What shape is a methane, CH4 molecule?
9. Which of the following substances is most likely to be soluble in petrol?
A. Sodium chloride
B. Lithium fluoride
C. Potassium bromide
D. Carbon tetrachloride
10. The reason ionic compounds only conduct when molten or when dissolved in water is
A. when solid the ions can move but when the compound is dissolved in water or molten, the
ions are not able to move
B. when solid the ions can't move but when the compound is dissolved in water or molten,
the ions are able to move
C. when solid the electrons can't move but when the compound is dissolved in water or
molten, the electrons are able to move
D. when solid the molecules can't move but when the compound is dissolved in water or
molten, the molecules are able to move