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Initial substances of a reaction are called reactants combined to give products.
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For example, silver nitrate ag2 -so4, which is aqueous solution, combines to give, combines with potassium chloride aquaise, to give silver chloride which is a solid and is insoluble in water.
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So this is considered to be a precipitate and forms potassium chloride.
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Sulfate aquaase solution.
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So ag2 -so4 and kcl are reactants, agcl and k2 -sophora products and this is the precipitation reaction.
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Next is zinc solid when combines with tin chloride aquaer solution, it forms, it forms zinc chloride aquaise solution and forms tin solid.
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This is the displacement reaction because zinc is displacing tin because zinc is more reactive than tin metal.
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Next is sodium hydroxide aquaise solution is combining with nitric acid aquaose solution.
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Here sodium hydroxide is a base, nitric acid is an acid...