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The sum of all the biochemical reactions in an organism is called metabolism.

It includes both exothermic and endothermic reactions.

Activation energy provides the "push" needed to start a chemical reaction.

Is the chemical reaction in this figure an exothermic or endothermic reaction?

Exothermic Reactions A chemical reaction that releases energy (as heat) is called an exothermic reaction.

This type of reaction can be represented by a general chemical equation: Reactants — Products Heat In addition to methane burning, another example of an exothermic reaction is chlorine combining with sodium to form table salt. Endothermic Reactions A chemical reaction that absorbs energy is called an endothermic reaction.

O/), as amended and updated by Creative Commons from time to time (the "CC License"), which is incorporated herein by this reference. Printed: June 8, 2012 /lexboo C0 2 2H 2 The arrow in a chemical equation separates the reactants from the products and shows the direction in which the reaction proceeds.

If the reaction could occur in the opposite direction as well, two arrows pointing in opposite directions would be used.

Activation Energy All chemical reactions need energy to get started.When methane burns, for example, it releases energy in the form of heat and light.Other chemical reactions absorb energy rather than release it.When a tube inside the pack is broken, it releases a chemical that reacts with water inside the pack.This reaction absorbs heat energy and quickly cools down the pack.

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