Exothermic Reaction

Exothermic and endothermic reaction happened everywhere around us. Basically exothermic and endothermic reaction is transfer energy to the surroundings and take in energy from the surroundings (BBC GCSE bitesize). If the reaction forward ，then is exothermic.If the reaction is the backwards ,then is endothermic.
When a reaction take place, the energy started to transfer from different object to the surroundings or take away energy from the surroundings. When temperature started to change.
Exothermic Reaction
An exothermic reaction is a chemical reaction that produces heat to the surroundings.When a reaction use heat and let the the surroundings cooling down , it is opposite of exothermic, so it is called endothermic. Exothermic reactions occur frequently in our daily life. The most common
It is important to our life because heat is important for human to keep warm and make use the enzymes in our body do not denatured. It is also important for chemical reactions , such as we can apply energy (heat ) to molecules in the reaction to make it happened quickly.

Endothermic Reaction
An endothermic reaction is a chemical reaction that absorb heat to the surroundings. If an endothermic reaction occurs , the temperature will falling down.The energy is transfer as heat ,it will cause the mixture of reaction and its surroundings to get colder. The common example for endothermic is the photosynthesis.Generally the sunlight provides the energy so the plants to make their food. In plant the chlorophyll is used as a catalyst that allows plants to make sugar (glucose) from carbon dioxide in the air. The energy is comes from sunlight. The chemical equation for the photosynthesis is