1st Semester Review

1st Semester Review - Term Definition chemistry the study...

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Term: chemistry Definition: the study of the properties of matter and how matter changes Term: hypothesis Definition: an educated guess Term: experiment Definition: the act of conducting a controlled test or investigation Term: matter Definition: anything that has mass and takes up space Term: law Definition: a summary of many experimental results and observations
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Term: theory Definition: a well-substantiated explanation of some aspect of the natural world Term: chemical change Definition: produces matter with a different composition than the original matter Term: chemical property Definition: characterizes materials in reactions that change their identity Term: physical change Definition: one in which the form or appearance of matter changes, but not its composition Term: physical property Definition: a quality or condition of a substance that can be observed or measured without changing the substance's composition
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Term: element Definition: any of the more than 100 known substances (of which 90 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter Term: compound Definition: a substance made up of atoms of two or more different elements joined by chemical bonds Term: gas Definition: the state in which matter changes in both shape and volume Term: liquid Definition: a substance in the fluid state of matter having no fixed shape but a fixed volume Term: mass Definition: the amount of matter in an object
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Term: mixture Definition: A combination of two or more substances that are not chemically combined Term: heterogeneous Definition: not uniform throughout Term: homogeneous Definition: of the same kind; uniform in composition throughout Term: phase Definition: a distinct state of matter in a system; gas, liquid or solid Term: precipitate Definition: a solid that forms and settles out of a liquid mixture
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