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unit 1 lessons 1-6
vocabulary energy and matter
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 of an object |
volume | the amount of space that an object takes up or occupies |
densiy | 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 | a change that affects one or more physical properties of a substance. |
chemical charge | happens when one or more substances change into entirely new substances with different properties |
law of conservation 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 elements |
element | one or more of the same kind of atom chemically combined |
compound | different kinds of atoms chemically combined |
mixture | contains a variety of elements and compounds that aren't chemically combined with each other |
pure substances | a sample matter either a single element or a single compound. |
heterogeneous | a uniform position |
homogeneous | same sweet taste from sugar-water mixture |
solid | substance that has a definitive volume and shape |
liquid | substance has a definitive volume but not definite shape |
gas | does not have a definite volume or shape |
freezing | when liquid turns into a solid |
melting | the temperature at which the substance change |
evaporation | some particles gain enough energy that they escape the surface of the earth |
boiling | a rapid change from a liquid to a gas |
condensation | the reverse of evaporation |
physical change | changing shape and size |
chemical change | not changing size and shape |