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Unit 1~ Matter
Lessons 1-6
Term | Definition |
---|---|
matter | anything that has mass and takes up space |
mass | describes the amount of matter in an object |
weight | a measure of gravitational force on an object |
volume | the amount of space an object takes up, or occupies |
density | a measure of the amount of mass in a given volume |
physical property | a characteristic of a substance that can be observed and measured without changing the identity of the substance |
chemical property | describes a substance's ability to change into a new substance with different properties |
physical change | is a change that affects one or more physical properties of a substance |
chemical change | when one or more substances change into entirely new substances with different properties |
law of conservation of mass | states that ordinary chemical and physical changes, mass is not created or destroyed but is only transformed into different substances |
atom | the smallest unit of an element that maintains the properties of that element |
element | made up of one or more at the same kind of atom chemically combined |
compound | made up of different kinds of atoms chemically combined |
mixture | contains a variety of elements and compounds that aren't chemically combined with each other |
pure substances | elements and compounds |
heterogeneous | mixture is one that does no have a uniform composition |
homogeneous | mixture where substances are evenly spread throughout |
solid | definite volume and shape |
liquid | substance has a definite volume but not definite shape |
gas | does not have a definite shape or volume |
freezing | the change in state in which a liquid becomes a solid |
melting | change of state from a solid to a liquid |
evaporation | the change of state from a liquid to a gas that usually occurs at the surface of a liquid over a wide range of temperatures |
boiling | a rapid change from a liquid to a gas or vapor |
condensation | the change of a state from gas to a liquid |
sublimation | the change from a solid state directly into a gas |
deposition | the change in state from a gas directly to a solid |