A substance or molecule that participates in a chemical reaction.

A substance that forms in a chemical reaction.

A chemical reaction that requires heat.

A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products.

a number that is used to measure some property or characteristic of a substance.

A law that states that mass cannot be created nor destroyed

Reaction in which two or more substances combine to form a new compound.

A reaction in which a single compound breaks down to form two or more simpler substances.

A reaction in which one element takes the place of another element in a compound.

A reaction in which a gas, a solid, or a molecular compound forms from the exchange of ions between two compounds.

A chemical reaction in which heat is released to the surroundings.

A substance that changes the rate of a chemical reaction without being used up or changed very much.

A substance that slows down or stops a chemical reaction.

Any compound that increases the number of hydronium ions when dissolved in water.

Any compound that increases the number of hydroxide ions when dissolved in water.

A value that is used to express the acidity or basicity of a system; measure of hydronium ion concentration.

The reaction of an acid and a base to form a neutral solution of water and salt

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