Crude oil

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Formation of Crude Oil

Crude oil is a liquid found deep under the Earth's surface.
It is made from the remains of organisms like algae and plankton.
These remains were deposited on the sea floor and covered by sediments.
Over millions of years, heat and pressure turned the remains into crude oil.

Composition of Crude Oil

Crude oil is a mixture of many different substances.
Most of these substances are hydrocarbons – compounds made of hydrogen and carbon.

Fractional Distillation Process

Crude oil is separated into different parts by fractional distillation.
In a refinery, crude oil is heated until it turns into a gas.
The gas enters a tall tower called a fractionating column.
The column is hotter at the bottom and cooler at the top.
As the gas rises, different substances cool and condense at different temperatures (different boiling points).
Liquids are collected at various levels, each collecting a different fraction.

Products and Their Uses

Petrol: Fuel for cars.
Diesel: Fuel for trucks, buses, and some cars.
Kerosene: Fuel for jet engines and heaters.
Fuel Oil: Used in ships and large industrial plants.
Butane and Propane: Fuel for cooking, heating, and lighters.
Lubricating oils: Reduce friction in engines and machines.

Environmental Impact

Burning fuels from crude oil releases carbon dioxide (CO₂).
CO₂ is a greenhouse gas that contributes to global warming.

States of matter: solid, liquid, gas. Crude oil is a liquid; fractional distillation involves heating to gas and cooling to liquid.

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Practice questions

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1.What is crude oil mostly made of?
Easy
- AHydrocarbons
- BCarbohydrates
- CProteins
- DFats
2.Which of the following is NOT a product obtained from fractional distillation of crude oil?
Easy
- APetrol
- BDiesel
- CKerosene
- DEthanol
3.In a fractionating column, where is the temperature highest?
Easy
- AAt the top
- BAt the bottom
- CIn the middle
- DIt is the same everywhere
4.Why does fractional distillation separate crude oil into fractions?
Easy
- ADifferent substances have different boiling points
- BDifferent substances have different densities
- CDifferent substances have different colors
- DDifferent substances have different viscosities
5.Which of the following correctly lists the fractions in order of increasing boiling point?
Medium
- APetrol, kerosene, diesel, fuel oil
- BFuel oil, diesel, kerosene, petrol
- CPetrol, diesel, kerosene, fuel oil
- DKerosene, petrol, diesel, fuel oil
6.What is a hydrocarbon?
Easy
- AA compound made of hydrogen and carbon only
- BA compound made of hydrogen and oxygen only
- CA compound made of carbon and oxygen only
- DA compound made of hydrogen, carbon, and oxygen
7.Which gas is released when fuels from crude oil are burned?
Easy
- ACarbon dioxide
- BOxygen
- CNitrogen
- DHydrogen
8.Why is crude oil described as a non-renewable resource?
Easy
- AIt is made from remains of organisms that lived millions of years ago and takes millions of years to form
- BIt can be made quickly in a laboratory
- CIt is found in unlimited quantities
- DIt is not used up when burned

More questions

9.Which of the following is a use of kerosene?
Easy
- AFuel for jet engines
- BFuel for cars
- CFuel for cooking
- DLubricating engines
10.What happens to crude oil in the first step of fractional distillation?
Easy
- AIt is heated until it turns into a gas
- BIt is cooled until it turns into a solid
- CIt is filtered to remove impurities
- DIt is mixed with water
11.Carbon dioxide is a greenhouse gas that contributes to which environmental problem?
Easy
- AGlobal warming
- BOzone depletion
- CAcid rain
- DSmog
12.Which of the following statements about crude oil formation is true?
Easy
- AIt is made from the remains of organisms like algae and plankton
- BIt is made from the remains of dinosaurs
- CIt is formed in a few years
- DIt is found in the atmosphere
13.The diagram shows a fractionating column used to separate crude oil. Which fraction is collected at point X?
Medium
- APetrol
- BKerosene
- CDiesel
- DFuel oil
14.A student sets up a simple distillation apparatus to separate a mixture of two liquids A and B. Liquid A boils at 80°C and liquid B boils at 150°C. Which liquid will be collected first and why?
Medium
- ALiquid A, because it has a lower boiling point and condenses first.
- BLiquid B, because it has a higher boiling point and condenses first.
- CLiquid A, because it has a higher boiling point and condenses last.
- DLiquid B, because it has a lower boiling point and condenses last.
15.The table shows the boiling points of four fractions from crude oil. Which fraction is most likely to be used as fuel for jet engines?
Medium
- AFraction W (boiling point 40°C)
- BFraction X (boiling point 120°C)
- CFraction Y (boiling point 250°C)
- DFraction Z (boiling point 350°C)
16.Which of the following is a hydrocarbon?
Easy
- ACarbon dioxide
- BMethane (CH4)
- CWater (H2O)
- DSodium chloride (NaCl)
17.A student investigates the viscosity of four fractions from crude oil at room temperature. She measures the time for a steel ball to fall through 10 cm of each fraction. The results are shown in the table. Which fraction has the highest viscosity?
Easy
- AFraction A (time 2 s)
- BFraction B (time 5 s)
- CFraction C (time 12 s)
- DFraction D (time 20 s)
18.Burning 1 kg of petrol releases about 44 MJ of energy and produces 3.1 kg of carbon dioxide. Burning 1 kg of diesel releases about 45 MJ of energy and produces 3.2 kg of carbon dioxide. Which fuel produces less carbon dioxide per MJ of energy released?
Hard
- APetrol
- BDiesel
- CThey produce the same amount
- DCannot be determined
19.In a fractionating column, which fraction would be collected at a point where the temperature is 200°C?
Medium
- APetrol
- BKerosene
- CDiesel
- DFuel oil
20.Which of the following products from crude oil is used to reduce friction in engines?
Easy
- APetrol
- BKerosene
- CLubricating oils
- DDiesel
21.The graph shows the boiling points of four hydrocarbons found in crude oil. Which hydrocarbon has the longest carbon chain?
Medium
- AHydrocarbon A (boiling point 36°C)
- BHydrocarbon B (boiling point 98°C)
- CHydrocarbon C (boiling point 174°C)
- DHydrocarbon D (boiling point 342°C)
22.A sample of crude oil is heated in a laboratory. The first vapour to be produced is collected and condensed. What is the most likely substance in this fraction?
Medium
- ABitumen
- BDiesel
- CPetrol
- DFuel oil
23.Which of the following is a non-renewable resource?
Easy
- ACrude oil
- BWood
- CWind
- DSolar energy
24.The table shows the boiling points of five fractions from crude oil. Which fraction is most likely to be used as fuel for ships?
Medium
- AFraction 1 (boiling point 40°C)
- BFraction 2 (boiling point 150°C)
- CFraction 3 (boiling point 250°C)
- DFraction 4 (boiling point 350°C)
25.In the fractional distillation of crude oil, why do different hydrocarbons condense at different levels in the fractionating column?
Medium
- AThey have different boiling points.
- BThey have different densities.
- CThey have different molecular sizes.
- DThey have different viscosities.
26.A student sets up a fractional distillation apparatus in the lab to separate crude oil. Which of the following is the correct order of fractions collected from the top of the column to the bottom?
Medium
- APetrol, kerosene, diesel, fuel oil
- BFuel oil, diesel, kerosene, petrol
- CDiesel, kerosene, petrol, fuel oil
- DKerosene, petrol, fuel oil, diesel
27.In a laboratory simulation of fractional distillation, a student heats a mixture of two liquids X and Y. Liquid X boils at 70°C and liquid Y boils at 120°C. The thermometer at the top of the column reads 75°C when the first drops of distillate are collected. Which liquid is being collected?
Medium
- ALiquid X
- BLiquid Y
- CA mixture of X and Y
- DNeither, the temperature is too high
28.Which of the following products from crude oil is used as a fuel for jet engines?
Easy
- AKerosene
- BDiesel
- CPetrol
- DFuel oil
29.Which of the following statements about the fractionating column is true?
Easy
- AThe bottom of the column is hotter than the top.
- BThe top of the column is hotter than the bottom.
- CThe temperature is the same throughout the column.
- DThe column is heated only at the top.
30.A student investigates the viscosity of four fractions from crude oil at room temperature. She measures the time for a steel ball to fall through 10 cm of each fraction. The results are: petrol 2 s, kerosene 5 s, diesel 12 s, fuel oil 30 s. Which fraction has the highest viscosity?
Medium
- AFuel oil
- BDiesel
- CKerosene
- DPetrol
31.The table shows the boiling points of four fractions from crude oil: petrol (40-70°C), kerosene (150-250°C), diesel (250-350°C), fuel oil (350-500°C). In a fractionating column where the temperature at a certain level is 200°C, which fraction would be collected as a liquid at that level?
Medium
- AKerosene
- BPetrol
- CDiesel
- DFuel oil
32.Which of the following is a greenhouse gas released when crude oil products are burned?
Easy
- ACarbon dioxide
- BOxygen
- CNitrogen
- DHydrogen
33.What is the main component of crude oil?
Easy
- AHydrocarbons
- BCarbon only
- CHydrogen only
- DOxygen and hydrogen
34.A student wants to separate a mixture of two liquids using simple distillation. Which piece of equipment is essential to measure the temperature of the vapour?
Easy
- AThermometer
- BBunsen burner
- CCondenser
- DConical flask
35.The diagram shows the arrangement of particles in a gas. Which statement best explains why a gas can be compressed easily?
Medium
- AThere are large spaces between particles.
- BThe particles are very small.
- CThe particles move slowly.
- DThe particles are attracted to each other.
36.A fractionating column is hotter at the bottom than the top. Is this statement true or false?
Easy
- ATrue
- BFalse
- CCannot tell
- DIt depends on the type of oil
37.Which of the following is NOT produced from the fractional distillation of crude oil?
Easy
- APetrol
- BKerosene
- CEthanol
- DDiesel
38.Burning fuels made from crude oil releases which gas that contributes to global warming?
Easy
- AOxygen
- BNitrogen
- CCarbon dioxide
- DHydrogen
39.In the fractional distillation of crude oil, which fraction has the highest boiling point?
Easy
- APetrol
- BKerosene
- CDiesel
- DFuel oil
40.Crude oil is formed from the remains of which type of organisms?
Easy
- ATrees and plants
- BAlgae and plankton
- CDinosaurs
- DFish and mammals
41.A fractionating column is hotter at the top than the bottom.
Easy
True or false?
42.Butane, petrol and diesel are examples of products that are made from the fractional distillation of crude oil.
Easy
True or false?
43.Petrol has a higher boiling point than diesel.
Easy
True or false?
44.Burning fuels made from crude oil releases carbon dioxide.
Easy
True or false?
45.Carbon dioxide is a greenhouse gas.
Easy
True or false?
46.Crude oil is described as non-renewable because it:
Easy
- ACan be made in a laboratory
- BTakes millions of years to form
- CIs found everywhere on Earth
- DCan be recycled
47.Match each fraction from crude oil with its primary use.
Medium
- Petrol
- Kerosene
- Fuel oil
- Butane
- Fuel for jet engines
- Fuel for cars
- Fuel for ships
- Fuel for cooking
48.Place the following fractions in order of increasing boiling point (lowest first).
Medium
- Diesel
- Petrol
- Fuel oil
- Kerosene
49.Which of the following are products obtained from the fractional distillation of crude oil? (Select all that apply.)
Medium
- APetrol
- BKerosene
- COxygen
- DDiesel
- EButane
50.A student investigates the viscosity of four fractions from crude oil at room temperature. She measures the time for a steel ball to fall through 10 cm of each fraction. The results are shown in the table below. Which fraction is most likely to be kerosene?
Medium
- AFraction A (time = 2 s)
- BFraction B (time = 8 s)
- CFraction C (time = 15 s)
- DFraction D (time = 30 s)
51.State what is meant by a hydrocarbon.
Easy
52.In a fractionating column, the temperature at the bottom is 350°C. A fraction with a boiling point range of 250–350°C condenses at a certain level. If the temperature decreases by 50°C for every 10 metres up the column, at what height (in metres) above the bottom would this fraction condense? Assume the fraction condenses at the top of its boiling range (350°C).
Hard
53.Complete the sentence using the words below.
Easy
Crude oil is a ____ resource because it takes ____ of years to form and is being used up much faster than it is formed.
54.The table shows the boiling points of four fractions from crude oil: petrol (40-70°C), kerosene (150-250°C), diesel (250-350°C), fuel oil (350-500°C). In a fractionating column, the temperature at a certain point is 200°C. Which fraction condenses at this point?
Medium
55.Describe how crude oil is formed.
Medium
56.Describe the process of fractional distillation.
Medium
57.State three products that can be made from crude oil and describe their uses.
Medium
58.Describe why fuels produced from crude oil would be described as non-renewable resources.
Easy
59.In a fractionating column, the temperature at the bottom is 350°C. A fraction with a boiling point range of 250–350°C condenses at a certain level. If the temperature decreases by 50°C for every 10 metres up the column, at what height (in metres) above the bottom would this fraction condense? Assume the fraction condenses at the top of its boiling range (350°C).
Hard
- A-1 m
- B1 m
- C0 m
- D2 m
60.The table shows the boiling points of four fractions from crude oil: petrol (40-70°C), kerosene (150-250°C), diesel (250-350°C), fuel oil (350-500°C). In a fractionating column, the temperature at a certain point is 200°C. Which fraction condenses at this point?
Medium
- A240 °C
- B180 °C
- C200 °C
- D220 °C

Revision notes

## Crude Oil Revision Notes ### Formation - Crude oil is a liquid found deep underground, formed from the remains of **algae and plankton**. - These remains were deposited on the sea floor, covered by sediments, and over **millions of years** heat and pressure turned them into crude oil. ### Composition - Crude oil is a **mixture** of many substances, mostly **hydrocarbons** (compounds made of **hydrogen and carbon** only). ### Separation: Fractional Distillation - Crude oil is separated into useful parts by **fractional distillation** in a refinery. - The oil is **heated** until it turns into gas, then enters a **fractionating column** which is **hotter at the bottom** and **cooler at the top**. - As the gas rises, different substances **condense** (turn back into liquid) at different heights because they have **different boiling points**. - Each level collects a different **fraction** (e.g., petrol, kerosene, diesel). ### Products and Uses - **Petrol**: Fuel for cars. - **Diesel**: Fuel for trucks, buses, some cars. - **Kerosene**: Fuel for jet engines and heaters. - **Fuel Oil**: Used in ships and industrial plants. - **Butane and Propane**: Fuel for cooking, heating, lighters, portable stoves. - **Lubricating oils**: Reduce friction in engines and machines. ### Environmental Impact - Burning crude oil fuels releases **carbon dioxide (CO₂)**, a **greenhouse gas** that contributes to **global warming**. - Crude oil is a **non-renewable** resource (it takes millions of years to form).

Crude oil: A liquid found deep underground, formed from the remains of organisms over millions of years, and is a mixture of hydrocarbons.
Hydrocarbon: A compound made of hydrogen and carbon only.
Fractional distillation: A process that separates crude oil into different fractions based on their different boiling points, using a fractionating column.
Fractionating column: A tall tower used in fractional distillation that is hotter at the bottom and cooler at the top, allowing different substances to condense at different levels.
Fraction: A group of hydrocarbons with similar boiling points collected from the fractionating column (e.g., petrol, diesel).
Greenhouse gas: A gas that traps heat in the atmosphere, contributing to global warming; carbon dioxide is an example.

Flashcards

What is crude oil?

Crude oil is a liquid found deep under the Earth's surface, made from the remains of organisms like algae and plankton.

How is crude oil formed?

Crude oil forms from the remains of organisms deposited on the sea floor, covered by sediments, and transformed over millions of years by heat and pressure.

What are hydrocarbons?

Hydrocarbons are compounds made of hydrogen and carbon.

Why do we need to separate crude oil?

Crude oil is a mixture of many substances; we separate it into different parts to use them.

What process is used to separate crude oil?

Fractional distillation.

Describe the first step of fractional distillation.

Crude oil is heated until it turns into a gas.

What is a fractionating column?

A tall tower used in fractional distillation that is hotter at the bottom and cooler at the top.

How does fractional distillation separate substances?

Different substances have different boiling points; as the gas rises, they cool and turn back into liquids at different temperatures, collected at various levels.

What is a fraction?

A group of substances with similar boiling points collected at a specific level in the fractionating column.

Name four fractions obtained from crude oil.

Petrol, kerosene, diesel, and fuel oil.

What is petrol used for?

Fuel for cars.

What is diesel used for?

Fuel for trucks, buses, and some cars.

What is kerosene used for?

Fuel for jet engines and heaters.

What is fuel oil used for?

Used in ships and large industrial plants for heating and power generation.

What are butane and propane used for?

Fuel for cooking, heating, and in lighters; propane also used for some engines and portable stoves.

What are lubricating oils used for?

To reduce friction in engines and machines.

What gas is released when burning fuels from crude oil?

Carbon dioxide (CO2).

Why is carbon dioxide a concern?

It is a greenhouse gas that contributes to global warming.

True or false: A fractionating column is hotter at the top than the bottom.

False. It is hotter at the bottom and cooler at the top.

True or false: Butane, petrol, and diesel are products from fractional distillation of crude oil.

True.

True or false: Petrol has a higher boiling point than diesel.

False. Diesel has a higher boiling point than petrol.

True or false: Burning fuels from crude oil releases carbon dioxide.

True.

True or false: Carbon dioxide is a greenhouse gas.

True.

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