11.3. Fuels
A subsection of Chemistry, 0620, through 11. Organic chemistry
Listing 10 of 283 questions
A student measured the highest temperature reached when four different fuels were burned. He used the apparatus shown below. thermometer copper can fuel clamp water spirit burner The same amount of each fuel was burned. Suggest two other things which the student should keep constant to make the experiment a fair test. 1. 2. Is burning an exothermic or an endothermic reaction? Give a reason for your answer. The table below shows the results. fuel molecular formula initial temperature / °C fi nal temperature / °C ethanol C2H6O hexane C6H14 pentane C5H12 propanol C3H8O Which fuel gave the highest temperature change? Which fuel has the highest relative molecular mass? You are not expected to do any calculations. Methane is a fuel. Draw the structure of methane showing all atoms and all bonds. Which one of the following fuels is largely methane? Tick one box. coal fuel oil gasoline natural gas Pentane and hexane belong to the same homologous series. How can you tell this from their names? Complete the following sentence about a homologous series using words from the list below. acidic alcohol compounds density different elements functional masses properties solid A homologous series is a family of similar with similar due to the presence of the same group.
0620_w15_qp_22
THEORY
2015
Paper 2, Variant 2
View
Biogas is made by fermenting animal and vegetable waste. The table shows the percentage composition of the gases present in a sample of biogas. substance present percentage present in biogas carbon dioxide 28.5 hydrogen 1.0 methane 62.0 nitrogen water vapour 2.4 other substances 0.1 total 100.0 Deduce the percentage of nitrogen present in this sample of biogas. Balance the chemical equation for the complete combustion of methane. CH4 + O2 CO2 + H2O Which one of these compounds belongs to the same homologous series as methane? Draw a circle around the correct answer. methanoic acid methanol propane propanol propene Methane is present in the refinery gas fraction produced by the fractional distillation of petroleum. Match the fractions on the left with their uses on the right. The first one has been done for you. fraction use refinery gas making roads fuel oil fraction making chemicals bitumen fuel for heating and cooking naphtha fraction fuel for ships  Draw a dot-and-cross diagram to show the electron arrangement in a molecule of hydrogen.  State one use of hydrogen. The biogas contains a small amount of compound C. The structure of compound C is shown. H H H C C H S H H O O H N C On the structure shown, draw a circle around the carboxylic acid functional group. How many different types of atoms are present in compoundC? Describe the manufacture of ethanol by fermentation. In your answer include: ● ● the names of the substances needed for fermentation ● ● the conditions needed for fermentation. 
0620_w19_qp_31
THEORY
2019
Paper 3, Variant 1
View
Questions Discovered
283