Term | Definition |
matter | anything that has mass and takes up space |
mass | describes the amount of matter in an object |
wieght | a measure of the gravitational force on an object |
volume | the amount of space that an object takes up |
density | a measure of the amount of mass in a given volume |
physical property | a characteristic of a substance that can be measured without changing the identity of the substance |
chemical property | describes a substances ability to change into a new substance with different properties |
physical change | a change that affects one or more physical properties of a substance |
chemical change | occurs when one or more substances change into an entirely new substance with different properties |
the law of conservation of mass | states that in ordinary chemical and physical change mass is not created or destroyed but is only transferred into different subtaces |
atom | the smallest unit of an element that maintanes the properties of the element |
element | made up of one or more of the same kind of atom chemically combinded |
compound | made up of different kinds of atoms of atoms of atoms chemically combinded |
mixture | contains a variety of elements and compounds that are not chemically combined with eacother |
pure substance | a substance that has definite physical and chemical properties |
heterogeneous | mixture is one that does not have a uniform composition |
homogeneous | substances that are evenly spread throughout |
solid | has definite volume and shape |
liquid | has definte volume but not a definite shape |
gas | has nor definite volume nor shape |
freezing | the change in state in which a liquid becomes a solid |
melting | change from solid to liquid |
evaporation | liquid to gas |
boiling | rapid change from liquid to gas or vapor |
condensation | gas to liquid |
sublimation | the change from a solid state directly into a gas |
deposition | gas directly to a solid |