C5 Chemicals of the natural environment
Activity AC5.A.1 Elements, compounds, and molecules
Cover A
To answer
1 The table provides some information about different
chemicals. For each of the following questions, there may be
more than one answer.
Name
Formula
Melting point (°C)
Boiling point (°C)
carbon monoxide
CO
205
191
magnesium chloride
MgCl2
714
1418
methane
CH4
182
161
nitrogen
N2
210
196
nitrogen monoxide
NO
163
151
oxygen
O2
219
183
potassium bromide
KBr
730
1435
sodium chloride
NaCl
808
1465
sulfur dioxide
SO2
75
10
water
H2O
0
100
Which of the chemicals is:
a a non-metallic element?
b a compound made from two non-metallic elements?
c a compound made from a metal and a non-metal?
d a gas at room temperature, 15 °C?
e a solid at 15 °C?
f
a liquid at 15 °C?
g made up of small molecules?
h made of a giant ionic structure?
i
a good conductor of electricity when liquid?
© University of York (UYSEG) and
the Nuffield Foundation
C5.A-3
This page may be copied solely for use
in the purchaser’s school or college
C5 Chemicals of the natural environment
Activity AC5.A.1 Elements, compounds, and molecules
Cover A
2
Ar
O2
N2
CO2
Ar2
CO
CH4
O
H2O
N
Na
NO
Select the correct symbol(s) or formula(s) from the box for:
a a nitrogen atom
b an oxygen molecule
c a metal atom
d compounds
e a gas that makes up 1% of the atmosphere
f
a molecule that is present mainly in the hydrosphere
3
a Which diagram above best represents an oxygen molecule?
b Which diagram above best represents a water molecule?
c Draw a diagram to represent a nitrogen molecule
© University of York (UYSEG) and
the Nuffield Foundation
C5.A-4
This page may be copied solely for use
in the purchaser’s school or college