Year9 Chemistry

Rocks are constantly due to different processes. This means rock types are changing between the three different rock types over millions of years. This is called the rock cycle.

The Earth has a layered structure made up of the crust, the mantle, the outer core and the inner core. These layers each have different structures and properties.

Find out all about carbon dioxide

A visual explanation of methane.

The air in the atmosphere is a mixture of gases. Most of the atmosphere is nitrogen (80%) with around 20% oxygen and other trace gases.

Human activities use resources from the Earth. Many of these resources are finite, they will eventually run out.

Many human activities release polluting gases into the atmosphere, such as farming animals for food, burning fossil fuels and deforestation.

Composite materials are made from two or more different types of material by a chemical process.

Polymers can be natural or synthetic. Synthetic polymers are known as plastics.

A metal higher up in the reactivity series will displace a less reactive metal from its compound. These displacement reactions can be predicted from the reactivity series.