How does an alkene react with bromine water?

It decolourises the orange bromine water

Why are long-chain hydrocarbons cracked?

To make more short-chain fuels and alkenes that are in higher demand

Their double bonds open and they join with no other product

They are not biodegradable and persist for many years

78 percent nitrogen, 21 percent oxygen

When the high temperature makes nitrogen and oxygen in the air react

15questions. Pick an answer and you'll see why right away.

What is crude oil?
On what property does fractional distillation separate crude oil?
As hydrocarbon chains get longer, what happens to flammability?
What is the general formula of an alkane?
How does an alkene react with bromine water?
Why are long-chain hydrocarbons cracked?
What functional group do all alcohols contain?
What are the products of fermentation of glucose?
What happens to the monomers in addition polymerisation?
Why is the disposal of addition polymers a problem?
What is the approximate composition of the atmosphere?
How do oxides of nitrogen form when fuels burn?
Which two gases are the main greenhouse gases linked to global warming?
A titration uses 0.0020 mol of acid that reacts 1 to 1 with alkali in 25.0 cm3. What is the alkali concentration?
A reaction gives 6.0 g of product from a theoretical 8.0 g. What is the percentage yield?