Paper 2 ( Questions )

Question 1

Where does nitrogen come from, when combusting diesel?

Answer 1

Air

Question 2

What effects does particulates from burning fossil fuels cause?

Answer 2

Global dimming

Question 3

Why is Carbon Monoxide difficult to detect?

Answer 3

It is colourless and odourless

Question 4

Sulfur is a common impurity in diesel, explain why this cause an environmental problem

Answer 4

Sulfur dioxide is produced when diesel is burnt, which causes acid rain, resulting in acidification of lakes
+ damage buildings
+ damage to trees/plants
+ damage to aquatic life
+ respiratory problems

Question 5

Why do substances in a mixture separates in the mobile phase ?

Answer 5

Different solubilities

Question 6

Paper Chromatography Practical

Answer 6

1- Draw a pencil line, near the bottom edge of the chromatography paper
2- Put a small dot of the ink on the pencil line
3- Put a small volume of solvent in the beaker
4- Place the chromatography paper in the solvent, and the dot of ink should be above the level of solvent
5- Support the paper in this position
6- Put a lid on the beaker
7- Leave to run, and then mark the position of the solvent
8- Remove from the beaker and leave to dry
9- Determinate Rf value. Measure the distance of all dots from start line, and then distance of solvent from start line.

Question 7

What is a formulation?

Answer 7

A mixture that have been designed for a specific function, and its components are precisely measured.

Question 8

Describe how crude oil is separated into fractions

Answer 8

1- Crude oil is heated to vaporise the hydrocarbons
2- Temperature of the column decreases from bottom to top
3- So hydrocarbons condense at different heights in the column
4- Because hydrocarbons have different boiling points

Question 9

Explain why Alkanes are cracked

Answer 9

Alkanes are cracked to form shorter chains of hydrocarbon, so it is more volatile and flammable, which is better for fuel

Question 10

Explain how greenhouses cause global warming

Answer 10

1- Greenhouse gases allow short length radiation to enter the atmosphere
2- Which are absorbed by the earth and re-emitted as long wavelength radiation
3- Which is absorbed by greenhouse gases in the atmosphere
4- This increases the temperature leading to global warming

Question 11

Explain how planting trees reduces global warming

Answer 11

1- Trees use carbon dioxide for photosynthesis, and carbon dioxide causes global warming
2- They remove CO2 from the atmosphere