A theory of chemical combination, first stated by John Dalton in 1803. It involves the following postulates: (1) Elements consist of indivisible small particles (atoms). (2) All atoms of the same element are identical; different elements have different types of atom. (3) Atoms can neither be created nor destroyed.
A laboratory is a facility that provides controlled conditions in which scientific or technological research, experiments, and measurement may be performed.
A few examples of changes in chemical change are, a change in the color of the chemical, change in the energy or temperature, and lastly change of odor.
