wzorowane1 pktotwartełatwe (szac.)
State the equation for the formation of glucose by photosynthesis.
Biofuels and renewable energy
Distinguish renewable from non-renewable energy sources, describe how biofuels store carbon fixed recently by photosynthesis (know its reactants and products), and weigh the advantages and disadvantages of biofuels against fossil fuels.
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wzorowane5 pktobliczenioweśrednie (szac.)
(i) Outline two advantages of using biobutanol rather than petrol (gasoline) as a fuel for vehicles. (ii) Calculate, using the average bond enthalpies in section 12 of the data booklet, the enthalpy change in for the combustion of…
wzorowane1 pktzamkniętełatwe (szac.)
Which statement describes a disadvantage of using bioethanol rather than petrol (gasoline) as a fuel for cars? A. The carbon dioxide released when bioethanol burns was recently removed from the atmosphere by the crop B. Bioethanol releases less energy per…
wzorowane1 pktotwartełatwe (szac.)
Pentadecane produced by cyanobacteria can be used as a biofuel. Explain why burning this biofuel adds less to the long-term buildup of atmospheric carbon dioxide than burning the same mass of pentadecane refined from crude oil.
wzorowane1 pktzamkniętełatwe (szac.)
Which of these fuels comes from a renewable energy source? A. kerosene obtained from crude oil B. biodiesel produced from rapeseed oil C. lignite (brown coal) D. hydrogen produced from natural gas