In a combustion reaction, fuel is burned and reacts with oxygen to release energy. Respiration is the chemical change that takes place inside living cells. Glucose and oxygen are used to release ...

The reactivity series shows metals in order of reactivity. The reactivity of a metal is related to its tendency to form positive ions. Iron and aluminium are extracted from their ores in various ways.

General adaptation syndrome (GAS) describes the three-stage process your body goes through when under stress: alarm, resistance, and exhaustion. Short-term stress during the alarm stage isn’t harmful ...

Photochemistry is the study of chemical processes that occur because of the absorption of light. The study of photochemical systems that use sunlight to drive important chemical reactions or to ...