Transcript 2C + O 2 2CO

Balance this equation:
C2H6 + O2  CO2 + H2O
2C2H6 + 5O2  2CO2 + 6H2O
“Nitrogen dioxide is
a primary pollutant”
Explain why this is wrong
NO2 is a secondary pollutant. It’s
produced in the atmosphere when
nitrogen monoxide reacts with oxygen
Name the biggest natural source of
the pollutant sulfur dioxide
Volcanoes
Write a balanced equation for the
incomplete combustion of charcoal
2C + O2  2CO
Find the mean of this data to 1dp:
10.1, 12.3, 11.4, 22.0, 12.6, 10.8
11.4
(22.0 is an outlier)
Town A has CO concentrations in the range 55 – 85
ppb. Town B has a mean concentration of 53ppb. Is
there a real difference between the two?
Yes. The mean for Town B is outside the
range for Town A.
Which two pollutants are
responsible for causing acid rain?
Nitrogen dioxide and
sulfur dioxide
Explain why carbon dioxide is not
really a pollutant.
It is used in photosynthesis by plants
(and we need plants); it causes the
greenhouse effect
What percentage of the air are:
carbon dioxide; water vapour;
oxygen?
CO2: 0.035%; H2O: 0-4%;
O2: 21%
“People with a better reading ability
have bigger shoe sizes”. Explain why
this correlation doesn’t mean shoe
size and reading ability are related.
It’s because both are
related to age.
What is the formula of methane?
CH4
Explain why incomplete combustion
can be dangerous
It produces carbon monoxide,
which is poisonous.
Explain why a congestion charge is
unlikely to reduce sulfur dioxide
pollution.
Vehicles don’t produce
much sulfur dioxide.
Complete: “Nitrogen monoxide is
produced when _______ and _______
from air react in a car engine
Nitrogen and oxygen
A _________ _________ converts
pollutants from car engines into
harmless gases.
Catalytic converter
Complete and balance the equation
for what happens in a catalytic
converter: CO + NO  N2 + __
2CO + 2NO  N2 + 2CO2
Complete: “Nitric acid (acid rain) is
formed when nitrogen dioxide reacts
with ______ in the air”
Water
Explain why a single reading may not give a
realistic value for the level of carbon
monoxide pollution in a particular place.
It could be an outlier; the device could
be broken; lots of readings can give you
a mean, which is a better estimate