chemical equations revision
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Understanding the general types of chemical reactions will help you to write and balance chemical equations. Physical states of matter and symbols All physical states are given at standard temperature and pressure for each chemical species. (aq) = aqueous solution (dissolved in water, from aqua or water). (l) = liquid (s) = insoluble solid or precipitate.
A chemical equation describes what happens in a chemical reaction . The equation identifies the reactants (starting materials) and products (resulting substance), the formulas of the participants, the phases of the participants (solid, liquid, gas), and the amount of each substance. Balancing a chemical equation refers to establishing the mathematical relationship between the quantity of reactants and products.