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A **coefficient** is a small whole number that appears in front of a formula in a balanced chemical equation. A **combustion reaction** is a chemical reaction in which an element or compound reacts with oxygen, releasing energy in the form of heat and light. A **compression** is the point on a med...

A **coefficient** is a small whole number that appears in front of a formula in a balanced chemical equation. A **combustion reaction** is a chemical reaction in which an element or compound reacts with oxygen, releasing energy in the form of heat and light. A **compression** is the point on a medium where a longitudinal wave has the maximum density. A **concave mirror** has an inwardly curving reflective surface as seen by the observer and reflects parallel light rays towards a common focal point in front of the mirror. **Concentration** is a measurement of the amount of solute that is dissolved in a given quantity of solvent; it is usually expressed in moles/Litre (mol/L). **Constructive interference** occurs when two interfering waves in a medium have a displacement in the same direction. A **converging lens** is thicker at its centre than its edges and refracts parallel rays of light towards a common focal point. A **convex mirror** has an outwardly curving reflective surface as seen by the observer and reflects parallel light rays away from a common focal point that appears to be behind the mirror. The **crest** of a wave is the point on the medium that exhibits the maximum positive or upward displacement from the rest position. The **critical angle** is the angle of incidence that produces an angle of refraction of 90° for any two media.