Click to edit Master subtitle styleChapter 4 – Chemical ReactionsA Chemical Reaction (a.k.a Chemical Change or Process) involves a change in the composition of the substances involved. One or more starting substances (Reactants, a.k.a Starting Materials) are converted into one ore more other substances (Products). Thus, a chemical reaction involves a rearrangement of atoms in substances, meaning that the way the atoms involved are joined together (bonded) is altered. We describe chemical reactions using Chemical Equations. Reactant formulae are written on the left, and product formulae on the right hand side of a chemical equation, separated by an arrow. Below is the chemical equation describing the combustion of butane (C4H10):Chemical Reactions are accompanied by the release or absorption of heat (see chapter on Thermochemistry), emission of light, formation of a precipitate, release of gas, or color change. The above equation tells us that 2 molecules of butane react with 13 molecules of oxygen gas to give 8 molecules of carbon dioxide and 10 molecules of water. These numbers are called the
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