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Biodiesel and petrodiesel A - VCE - SSCE Chemistry - Question 2 - 2021 - Paper 1
Question 2
Biodiesel and petrodiesel A. have different viscosities. B. have the same environmental impact. C. contain molecules with no polar groups. D. will flow easily throu... show full transcript
Worked Solution & Example Answer:Biodiesel and petrodiesel A - VCE - SSCE Chemistry - Question 2 - 2021 - Paper 1
Step 1
A. have different viscosities.
Answer
Biodiesel and petrodiesel do indeed have different viscosities. Biodiesel, being derived from vegetable oils or animal fats, contains higher amounts of triglycerides which can lead to higher viscosity compared to petrodiesel, which is derived from crude oil.
This difference in viscosity can affect the fuel's flow characteristics and performance in engines.
Step 2
B. have the same environmental impact.
Answer
This statement is not accurate. Biodiesel generally has a lower environmental impact compared to petrodiesel. It produces fewer greenhouse gases and pollutants when burned. The renewable nature of biodiesel also contributes to its lesser impact.
Step 3
C. contain molecules with no polar groups.
Answer
This statement is also incorrect. Biodiesel molecules contain polar groups, particularly due to the presence of ester functional groups derived from fatty acids. In contrast, petrodiesel has a more hydrocarbon-based composition with fewer polar characteristics.
Step 4
D. will flow easily through fuel lines in very cold climate conditions.
Answer
This statement is not true for biodiesel. Biodiesel can gel in cold temperatures, making it less effective in very cold climates. Petrodiesel, on the other hand, typically performs better under cold conditions because of its lower cloud point.