Chemical changes
Monitoring the environment
Understand how to collect and analyse samples and how to interpret the results to inform others about levels of pollution in 大象传媒 Bitesize 4th Level Science
Energy changes in chemical reactions
Exothermic reactions transfer energy to the surroundings and the temperature of the surroundings increases. Endothermic reactions take in energy and the temperature of the surroundings decreases.
The reactivity of metals
The reactivity series lists metals from the most reactive to the least reactive. A metal can displace a less reactive metal from its compounds. This is useful for extracting metals from their oxides.
Video playlist
Conservation of mass in chemical reactions. Video
The concept of conservation of mass in chemical reaction using two examples.
