Chemistry Concepts

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Acid

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A chemical compound that increases the concentration of hydrogen or hydronium ions in an aqueous solution. Also referred to as a proton donor.

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Base

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A chemical compound that increases the concentration of hydroxide ions in aqueous solution. Also referred to as a proton acceptor.

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Collision Theory

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Reacting particles must hit one another at the proper angle and with enough energy for a chemical reaction to occur.

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Equilibrium

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When the forward and reverse reactions are happening at the same rate. This is indicated by a double arrow.

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Le Chatelier's Principle

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When conditions change for a system at equilibrium, the system responds by reducing the effect of the change.

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Activation Energy

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The minimum amount of energy required for a chemical reaction to occur.

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Endothermic

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A chemical reaction where energy is absorbed into the system, and the products hold more potential energy than the reactants.

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Exothermic

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A chemical reaction where energy is released from the system, typically through heat or light.