Gap-fill worksheet question Quiz "Burning Fossil Fuels and Environmental Problems"

Select answers and CHECK. Copying NOT permitted © Doc Brown's Chemistry Clinic

   2      3      4      5      alkali      burned      carbon      carbon dioxide      carbon monoxide      complete combustion      energy      fossil fuels      global warming      incomplete combustion      neutralise      oxygen      soot      sulfur dioxide      waste gases      water   
(1) oilflame.gif All contain and/or hydrogen and may also contain some sulfur and release large amounts of on burning which makes them so useful to industrial society, but there is a price to pay!

(2) The general word equation for 'clean' is
hydrocarbon + (in air) ===> carbon dioxide + water
Two possible word equations for 'polluting' are
hydrocarbon + ===> (soot) + water
hydrocarbon + ===> + water

(3) Balance the following symbol equations for ...
... complete combustion of methane: CH4 + O2 ===> CO2 + H2O
... complete combustion of propane: C3H8 + O2 ===> CO2 + H2O
... incomplete combustion of methane: CH4 + O2 ==> C + H2O
... incomplete combustion of methane: CH4 + O2 ===> CO + H2O

(4) The exhaust/waste gases from motor vehicles or power stations etc. released into the atmosphere when a fuel burns may include ...
... (i) gas is formed by the of fossil fuel molecules is a greenhouse gas that contributes to .
... (ii) which easily condenses e.g. liquid drops from a car engine exhaust.
... (iii) , a very poisonous gas, formed by the of a hydrocarbon fuel. This gas reduces the capacity of blood to carry . It is formed in car engines and faulty gas appliances.
... (iv) which causes acid rain.

(5) j0104528resize.gif Solid black particles of (mainly carbon) may also be released by the of fossil fuels.

(6) Sulfur can be removed from fuels from crude oil before they are , and this reduces the amount of the acidic gas that is released into the environment on combustion.

(7) In power stations sulfur dioxide can be removed from the after combustion by passing the smoke through an to absorb and the acidic gas.

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