Balance this equation: C 2 H 6 + O 2  CO 2 + H 2 O 2C 2 H 6 + 5O 2  2CO 2 + 6H 2 O “Nitrogen dioxide is a primary pollutant” Explain why this is wrong.

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Presentation transcript:

Balance this equation: C 2 H 6 + O 2  CO 2 + H 2 O 2C 2 H 6 + 5O 2  2CO 2 + 6H 2 O “Nitrogen dioxide is a primary pollutant” Explain why this is wrong NO 2 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 + O 2  2CO Find the mean of this data to 1dp: 10.1, 12.3, 11.4, 22.0, 12.6, (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? CO 2 : 0.035%; H 2 O: 0-4%; O 2 : 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? CH 4 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  N 2 + __ 2CO + 2NO  N 2 + 2CO 2 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