End Of Unit Questions Flashcards
Name the products when ethane burns completely
Water and carbon dioxide
Give three reasons why fractions with lower boiling points are more useful as fuels
Burn more easily, runny liquids, burn with clean flame
Name 2 fuels that can be made from renewable sources
Biodiesel and hydrogen
Some exhaust fumes contain particulates. What are particulates and how are they produced?
Solid soot and unburned hydrocarbons produced by incomplete combustion
Explain why burning some fuels produces sulphur dioxide
The fuel contains sulphur which oxidise to form sulphur dioxide
Propane is used as a fuel for cookers. Explain why propane should always be burned in a plentiful supply of air
To prevent incomplete combustion and the release of dangerous gases
Why are some scientists concerned about the carbon dioxide produced by burning fossil fuels?
- carbon locked up in fossil fuels
- increases carbon dioxide in atmosphere
- carbon dioxide is a greenhouse gas
- may cause global warming
Write down 4 facts about pentane that you can deduce from its formula
- alkane
- saturated
- only has single bonds
- hydrocarbon
Explain what happens in a fractional distillation column
Crude oil vapour enters column, vapour rises until boiling point of compound is reached, compound condenses and is collected as liquid
Write a balanced symbol equation for the complete combustion of ethanol, C2H6O
C2H6O + 3O2 –> 2CO2 + 3H2O
Write a balanced symbol equation of the reaction of hydrogen with oxygen
2H2 + O2 –> 2H2O
Explain why scientists are interested in using hydrogen as a fuel
- only product is water
- no pollutant gases produced
- can be made from water
Why is crude oil separated into fractions?
To make useful fuels and products
