A laboratory demonstration is used to explain how increasing carbon dioxide levels in the atmosphere are causing the pH of the oceans to change.

Duration: 02:23

The use of the pH scale in food chemistry is discussed. The pH of food stuffs is measured to show how bacteria are killed when the acidity is increased. subtitled

Duration: 01:01

A news report about a member of a Mexican drug cartel who has told police he used chemicals to dissolve the bodies of hundreds of murder victims.

Duration: 01:36

Jim Al-Khalili recreates Smithson Tennant's famous experiment by burning a diamond to prove it is made from carbon.

Duration: 03:06

Dr Yan demonstrates if metal gets heavier when you burn it using iron wool.

Duration: 00:59

A description of the Ostwald Process of creating nitrogen dioxide by combining ammonia with oxygen.

Duration: 01:21

How a chemical reaction takes place during cooking to improve the taste of food. Introduces the terms 'reactants' and 'products'. subtitled

Duration: 03:25

Collisions of atoms are described as causing reactions. The four ways to speed up rates of reactions are given.

Duration: 02:11

Will the mass of iron wool change when it is burned and if so will it increase or decrease? subtitled

Duration: 01:12

Carbon burns in oxygen to form carbon dioxide.

Duration: 02:19

The burning of methane as a chemical reaction.

Duration: 02:51

An introduction to the concept of conservation of mass in chemical reaction using two examples.

Duration: 02:03

An introduction to the difference between elements and compounds, using those present in air as an example.

A demonstration of an endothermic reaction and an exothermic reaction, together with an explanation of the terms.

Duration: 02:25

A demonstration of the process that occurs inside reusable hand warmers.

Duration: 01:35

A news report about the shortage of rock salt in the UK caused by the icy weather in February 2009. Some roads in Staffordshire may be forced to close as the council reduces gritting services to preserve salt supplies.

Duration: 01:15

A demonstration of how particle size and concentration can alter the rate of a chemical reaction.

Duration: 00:40

The use of food juices as indicators of acidity and alkalinity is demonstrated. subtitled

Duration: 01:24

The formation of ammonia by sparking a mixture of nitrogen and hydrogen. This is known as the Haber Process.

Duration: 00:27

In this cartoon oxygen and iron atoms combine to form a new substance - iron oxide. subtitled

Duration: 02:26

An explanation of the difference between mixtures and compounds, in which reactants and products are explained.

Duration: 02:10

A brief introduction to molecules and compounds, explaining the differences between them and giving examples.

Duration: 00:33

How an acid and an alkali can neutralise each other to give a neutral solution with a pH of 7. subtitled

Duration: 03:16

An investigation into how knowledge of a neutralisation reaction is put to use in diving equipment - looking at a 'rebreather' and how soda lime neutralises exhaled carbon dioxide.

Duration: 00:59

How bicarbonate of soda is used to ease indigestion or neutralise an acid stomach. A reaction takes place to produce harmless salt and neutral water. subtitled

Duration: 03:09

Chemical reactions are used to produce different colours of dye to change the colour of a white football kit. subtitled

Laboratory demonstrations of the effect of concentration, surface area, temperature and catalysts on reaction rate.

Duration: 01:19

An introduction to reactants and products in a chemical reaction. Baking a cake is used as an analogy to describe the differences between mixing and chemically combining substances.

Duration: 02:23

A demonstration of how to make an acid-alkali indicator from red cabbage.

Duration: 01:37

The presenter uses his red cabbage indicator to test household acids and alkalis.

Duration: 01:07

Presenter Jem builds a hybrid rocket and tests it in a lab.

Duration: 00:37

Children ask why a raw onion tastes so different from a cooked onion.

Duration: 00:27

A cooked onion is chemically different to a raw onion and has a different taste, look, and smell. subtitled

Duration: 04:31

Presenter Jem's toffee powered hybrid rocket was ingenious but dangerous. See how it was built and why toffee is a better fuel than pork pies.

Duration: 03:09

Demonstrates the use of universal indicator to test for acids and alkalis and introduces the idea that chemicals can be acidic, alkaline or neutral. subtitled

Duration: 4:04

Presenter Greg Foot demonstrates how heat, a fuel and oxygen are required to produce fire. He shows how understanding the science of combustion and how water absorbs heat can be used to prevent fire from injuring the human body.