Chemistry

What is the general formula for alkanes?

How can alkanes be described?

What is a covalent bond?

What is the formula for an alkene?

How can alkenes be described?

What happens to bromine when it is mixed with an alkene?

In the reaction, ethene -> poly(ethene):

Why does paint contain a pigment?

Colloids:

What is the key feature of thermochromic paints?

Which process removes carbon dioxide from the atmosphere?

Which of these process releases carbon monoxide into the atmosphere?

What is combustion?

One of the key reactions in a catalytic converter is:

What caused the proportion of oxygen in the atmosphere to increase?

Which of the following is a reason for the decrease in water vapour in the Earth's atmosphere?

Why is crude oil called a fossil fuel?

What happens to a liquid during its separation from a mixture by distillation?

The top of an oil fractionating column is:

Compared to large hydrocarbons, small hydrocarbons are:

Which process allows large hydrocarbons to be broken down into smaller hydrocarbons?

How is a positively charged ion formed from an atom?

What will be the charge on an aluminium ion?

What will be the charge on a sulfide ion, formed from a sulfur atom?

What will be the formula of an ionic compound formed from calcium and oxygen?

When a negative ion is formed because an atom has gained an electron, what term can be used to describe this process?