IB myp 4-5 Chemistry – Practice Questions- All Topics
Topic :Pure and impure substances–separation techniques including: filtration, distillation [including crude oil]
Topic :Pure and impure substances- Weightage : 21 %
All Questions for Topic : types of mixtures [solutions, oils, alloys, emulsions],separation techniques including: filtration, distillation [including crude oil],chromatography
Question:
Why does Malta, which is 99% dependent on fossil fuels, have less of an impact on global demand than China which is 88% dependent on fossil fuels?
▶️Answer/Explanation
Ans: Malta has a far smaller impact on the global demand for fossil fuels than China because Malta is a much smaller country with a much smaller population compared to China, one of the most
densely populated countries in the world.
Question:
Look at the charts and the illustration of fractional distillation. Explain which crude oil is best suited to the production of gasoline.
▶️Answer/Explanation
Ans: Gasoline is a volatile liquid with a low boiling point. It is extracted from crude oil and is considered one of the light products. Saharan crude oil from Algeria has the highest proportion of light products.
Question:
Explain why crude oil from Venezuela is called heavy oil. How does the molecular mass of the most common hydrocarbon in this crude oil differ from the hydrocarbons commonly found in Saharan crude oil?
▶️Answer/Explanation
Ans: Crude oil from Venezuela is called heavy oil as it has a high percentage of long carbon chain hydrocarbons. The majority of products made from this crude oil have a high density such as bitumen, lubricating oils and fuel oils.
Question:
The terms sweet crude oil and sour crude oil refer to the sulfur content of the crude oil. Crude oil with less than 0.5% sulfur content is classified as sweet. Which crudes on this graph are considered sweet oil?
▶️Answer/Explanation
Ans: Saharan (Algeria) and Brent (North Sea) are classified as being sweet crude oil.