ASTR-122 Lecture Notes - Lecture 1: Calcium Hydroxide, Sodium Acetate, Limewater
8 Apr 2016
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Document Summary
Cellular respiration is a chemical reaction that takes place in the cells in your body. A chemical reaction takes place when two or more substances combine to form new substances. Different types of chemical reactions can occur, including combination, decomposition, displacement and exchange reactions. The substances at the beginning of the reaction are called reactants. The new materials produced by the reaction are called products. The properties of the products differ from those of the reactants, thus a chemical change has occurred. A chemical change results from a chemical reaction. Evidence that a chemical change has occurred include: a change in colour. The formation of a solid (precipitate) or a gas (bubbles) A chemical change, which releases energy, is called exothermic. A chemical change, which absorbs energy, is called endothermic. Combustion is a chemical reaction that occurs when oxygen reacts with a substance to form a new substance and gives off energy.
