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U1 <1-6
Matter and Energy
Term | Definition |
---|---|
matter | anything that has mass and takes up space |
mass | describes the amount of matter in an object |
weight | 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 | 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 | 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 in ordinary chemical and physical changes, mass is not created or destroyed but is only transformed into different substances |
atom | smallest unit of an element that maintains the properties od that element |
element | made up of one or more of the same kind of atom chemically combined |
compound | made up of different kinds of atoms chemically combined |
mixture | variety of elements and compounds that are not chemically combined with each other |
pure substance | elements and compounds |
heterogeneous | one that does not have a uniform composition |
homogeneous | part of the sugar-water mixture with the same taste |
solid | substance has a definite volume and shape |
liquid | substance has a definite volume but not a definite shape |
gas | does not have a definite volume or shape |
freezing | change in state in which a liquid becomes a solid |
melting | change of state from a solid to a liquid |
evaporation | particles gain enough energy that they escape from the surface of the liquid and become gas |
boiling | a rapid change from a liquid to a gas, or vapor |
condensation | change of state from a gas to a liquid |
sublimation | change from a solid state directly into a gas |
deposition | the change in state from a gas directly to a solid |