Crude Oil
Overview
Crude oil is one of the most important raw materials on the planet. It fuels transport, heats homes, and provides the starting molecules for plastics, medicines, and synthetic fabrics. Yet straight out of the ground it is little more than a thick, dark, foul-smelling liquid. The value lies in separating it into useful parts.
In this lesson you will learn how fractional distillation splits crude oil into fractions, what each fraction is used for, and how cracking converts surplus heavy molecules into the lighter ones industry demands. You will also explore why burning hydrocarbons is a double-edged sword: essential for energy, yet a major source of atmospheric pollution.
Objectives
- know that crude oil is a mixture of hydrocarbons
- describe how the industrial process of fractional distillation separates crude oil into fractions
- know the names and uses of the main fractions obtained from crude oil: refinery gases, gasoline, kerosene, diesel, fuel oil and bitumen
- know the trend in colour, boiling point and viscosity of the main fractions
- know that a fuel is a substance that, when burned, releases heat energy
- know the possible products of complete and incomplete combustion of hydrocarbons with oxygen in the air
- understand why carbon monoxide is poisonous, in terms of its effect on the capacity of blood to transport oxygen references to haemoglobin are not required
- know that, in car engines, the temperature reached is high enough to allow nitrogen and oxygen from air to react, forming oxides of nitrogen
- explain how the combustion of some impurities in hydrocarbon fuels results in the formation of sulfur dioxide
- understand how sulfur dioxide and oxides of nitrogen contribute to acid rain
- describe how long-chain alkanes are converted to alkenes and shorter-chain alkanes by catalytic cracking (using silica or alumina as the catalyst and a temperature in the range of 600-700 ºC)
- explain why cracking is necessary, in terms of the balance between supply and demand for different fractions
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Crude Oil. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Crude oil is a mixture of: A) Elements B) Hydrocarbons C) Metal oxides D) Noble gases Answer: B
- In fractional distillation, which fraction is collected nearest the top of the column? A) Bitumen B) Diesel C) Refinery gases D) Fuel oil Answer: C
- Which gas produced by incomplete combustion is toxic and odourless? A) Carbon dioxide B) Sulfur dioxide C) Carbon monoxide D) Nitrogen dioxide Answer: C
- What type of catalyst is used in catalytic cracking? A) Iron B) Platinum C) Silica or alumina D) Manganese dioxide Answer: C
- As the chain length of hydrocarbons in crude oil increases, the boiling point: A) Decreases B) Stays the same C) Increases D) Fluctuates Answer: C
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Recommended Books
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