Politics of France - Constitution. 1  A popular referendum approved the constitution of the French Fifth Republic in 1958, greatly strengthening the authority of the presidency and the executive with respect to Parliament.
In chemistry, a mixture is a material made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.
Mixtures can be either homogeneous or heterogeneous: 1  A homogeneous mixture, sometimes called a solution, is relatively uniform in composition; every portion of the mixture is like every other portion. 2  A heterogeneous mixture is a mixture whose composition varies from position to position within the sample.