On September 5, 1774, delegates from each of the 13 colonies except for Georgia (which was fighting a Native-American uprising and was dependent on the British for military supplies) met in Philadelphia as the First Continental Congress to organize colonial resistance to Parliamentâs Coercive Acts.he First Continental Congress, which was comprised of delegates from the colonies, met in 1774 in reaction to the Coercive Acts, a series of measures imposed by the British government on the colonies in response to their resistance to new taxes.
Let's review. Pure substances are defined as substances that are made of only one type of atom or molecule. The purity of a substance is the measure of the extent to which a given substance is pure. The physical properties of a pure substance include well-defined melting and boiling points.
A chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds. Chemical substances can be chemical elements, chemical compounds, ions or alloys.hemical substances are often called 'pure' to set them apart from mixtures. A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory.