Chemistry - 4CH1 PearsonEdexcel

Crude Oil

Muhtasari

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.

Malengo

  1. know that crude oil is a mixture of hydrocarbons
  2. describe how the industrial process of fractional distillation separates crude oil into fractions
  3. know the names and uses of the main fractions obtained from crude oil: refinery gases, gasoline, kerosene, diesel, fuel oil and bitumen
  4. know the trend in colour, boiling point and viscosity of the main fractions
  5. know that a fuel is a substance that, when burned, releases heat energy
  6. know the possible products of complete and incomplete combustion of hydrocarbons with oxygen in the air
  7. 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
  8. know that, in car engines, the temperature reached is high enough to allow nitrogen and oxygen from air to react, forming oxides of nitrogen
  9. explain how the combustion of some impurities in hydrocarbon fuels results in the formation of sulfur dioxide
  10. understand how sulfur dioxide and oxides of nitrogen contribute to acid rain
  11. 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)
  12. explain why cracking is necessary, in terms of the balance between supply and demand for different fractions

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Maelezo ya Somo

Every litre of petrol you see at a filling station began as crude oil buried deep underground. That oil is a mixture of hundreds of different hydrocarbons, each with different chain lengths and boiling points. Refining separates this mixture into groups of molecules that are actually useful, and cracking reshapes the ones we have too much of into the ones we need most. Understanding this chain of processes is central to Edexcel's organic chemistry unit.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Crude Oil. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

  1. Crude oil is a mixture of: A) Elements B) Hydrocarbons C) Metal oxides D) Noble gases Answer: B
  2. 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
  3. Which gas produced by incomplete combustion is toxic and odourless? A) Carbon dioxide B) Sulfur dioxide C) Carbon monoxide D) Nitrogen dioxide Answer: C
  4. What type of catalyst is used in catalytic cracking? A) Iron B) Platinum C) Silica or alumina D) Manganese dioxide Answer: C
  5. 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

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Vitabu Vinavyopendekezwa

Pearson Edexcel International GCSE (9-1) Chemistry Student Book
Pearson Edexcel International GCSE (9-1) Chemistry Student Book
Manukuu: First edition
Mchapishaji: Pearson Education
Mwaka: 2017
ISBN: 978-0-435-18527-9
Maelezo: Endorsed student book covering the full 4CH1 specification.

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