Science / Chemistry / Reactant: A substance that is consumed during a chemical change.

Limiting Reactant

Science / Chemistry / Limiting Reactant: The reactant that limits the amount of product produced in a chemical reaction. For example, mixing one mole of H2(g) with one mole of O2 produces one mole of steam (H2O(g)), with half a mole of O2(g) MORE

Reaction Rate

Science / Chemistry / Reaction Rate: A reaction rate is the speed at which reactants are converted into products in a chemical reaction. The reaction rate is given as the instantaneous rate of change for any reactant or product, and is u MORE

Spectator Ion

Science / Chemistry / Spectator Ion: A spectator ion is an ion that appears as both a reactant and a product in an ionic equation. For example, in the ionic equation Ag+(aq) + NO3-(aq) + Na+(aq) + Cl-(aq) = agcl(s) + Na+(aq) + NO3-(aq) t MORE

Redox Reaction

Science / Chemistry / Redox Reaction: A reaction that involves transfer of electrons from one substance to another. Redox reactions always involve a change in oxidation number for at least two elements in the reactants. MORE

Collision Theory

Science / Chemistry / Collision Theory: A theory that explains reaction rates in terms of collisions between reactant molecules. MORE

Reaction Quotient

Science / Chemistry / Reaction Quotient: The product of the concentrations of the products, divided by the product of the concentrations of the reactants, for a chemical reaction which is not necessarily at equilibrium. For example, the reac MORE