11.3. Fuels
A subsection of Chemistry, 0620, through 11. Organic chemistry
Listing 10 of 283 questions
The names of nine substances are shown. aluminium oxide ammonia carbon monoxide anhydrous cobalt(chloride hydrated copper(sulfate iron(oxide nitrogen dioxide silver steel Answer the following questions using these substances. Each substance may be used once, more than once or not at all. Name the substance that is: the main constituent of hematite ������������������������������������������������������������������������������������������ a gas produced in car engines which causes acid rain ������������������������������������������������������� an alkaline gas ��������������������������������������������������������������������������������������������������������������������� an element ��������������������������������������������������������������������������������������������������������������������������� a gas formed by the incomplete combustion of fossil fuels ������������������������������������������������� used to test for the presence of water. �������������������������������������������������������������������������������� 
0620_w20_qp_43
THEORY
2020
Paper 4, Variant 3
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A list of compounds is shown. ammonia carbon dioxide carbon monoxide cobalt(chloride ethane ethene glucose methane potassium sulfate sodium phosphate sulfur dioxide Answer the following questions using only the compounds from the list. Each compound may be used once, more than once or not at all. Give the name of the compound that: is an unsaturated hydrocarbon leads to the deoxygenation of water in rivers is a gas which turns damp red litmus paper blue is the main constituent of natural gas is a product of photosynthesis is a compound of a transition element. 
0620_w23_qp_32
THEORY
2023
Paper 3, Variant 2
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Energy is given out when fuels burn. State the name given to a chemical reaction which releases energy. Hydrogen can be used as a fuel. Complete the symbol equation for the burning of hydrogen in oxygen. H2 + → 2H2O Gasoline is a mixture of hydrocarbons containing between 5 and 10 carbon atoms. Four of these hydrocarbons are shown below. C H H H C H H C H H A C H H C H H H C H H H C H H C H H B C H H C H H C H H C H H C H H H C H H H C H H C H H C C H H C H H C H H H C H H H C H H C H H D C H H C H H C H H C H H H Which one of these structures, A, B, C or D, has the highest relative molecular mass? You are not expected to do any calculations. Give one use of gasoline. The table shows the boiling points of the straight-chain hydrocarbons in the gasoline fraction. number of carbon atoms boiling point / °C On the grid below, plot a graph to show how the boiling point changes with the number of carbon atoms in these hydrocarbons. Draw a smooth curve through the points. boiling point / °C number of carbon atoms Use your graph to deduce the boiling point of the hydrocarbon with 7 carbon atoms. boiling point °C The alkanes are a homologous series of hydrocarbons. What is meant by the term homologous series ? Alkanes can be cracked to form alkenes and smaller alkanes. State the conditions needed for cracking.
0620_s13_qp_23
THEORY
2013
Paper 2, Variant 3
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Questions Discovered
283