chemistry: Matter

In our first section of measurement we covered matter. Matter is anything that has mass and takes up space. There are three states in which we find matter, which are water, liquid, and gas. We classify this matter using a chart with many levels. if the matter is uniform it is homogeneous. If the matter is not then it is heterogeneous. If the matter was homogeneous and has a variable composition it is a homogeneous mixture, but if it doesn't have a variable composition then it is a pure substance. If the matter is a pure substance and can be separated into simple substances it is a compound, and if not it is an element. With matter there are physical properties which are observed without changing into another substance, and there are chemical properties which can only be observed when changing into another substance. Some physical properties are boiling point,and density. Some chemical properties are heat of combustion, chemical stability, and toxicity.