Zadanie 9a
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.
Tę umiejętność sprawdza 9 zadań wzorowanych na arkuszach IB z lat 2023–2025.
Zadania sprawdzające tę umiejętność: 9 Otwórz w wyszukiwarce z filtrami
Zadanie 9b
(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 kJ mol−1 for the combustion of…
Zadanie 21
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…
Zadanie 5c
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.
Zadanie 22
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
Zadanie 5a
Glucose is made in the leaves of green plants by photosynthesis. Write the balanced equation for the overall reaction of photosynthesis.
Zadanie 12b
Bioethanol is made from the sugars that plants produce by photosynthesis. Write the balanced summary equation for photosynthesis, in which glucose is formed.
Zadanie 14a
Petrol (gasoline) is a mixture of hydrocarbons and can be blended with bioethanol. The carbon footprint of a fuel can be expressed as the mass of carbon dioxide, in kg, produced per kg of fuel burned. (i) Calculate the carbon footprint of heptane,…
Zadanie 15a
(i) Write the balanced equation for photosynthesis, in which glucose is formed. (ii) Explain how the large-scale planting of fast-growing trees is intended to reduce the rate of global warming.