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Compounds and Mixtures

Test your knowledge of Elements, Compounds, and Mixtures Vocabulary!

AB
elementpure substance that cannot be broken down into simpler substances by chemical or physical means. Each element has unique physical and chemical properties.
compounda pure substance made up of atoms of 2 or more different elements joined together by chemical bonds.
mixturea combination of 2 or more subtances that are not chemically combined. Not a pure subtance.
pure substancea sample of matter, either a single element or a single compound, that has definite chemical and physical properties.
physical changea change of matter from one form to another without a change in chemical properites -- such as a state change, dissolving, crushing, bending, cutting, etc.
chemical changea change that occurs when materials are changed by the making or breaking of chemical bonds into new substances with new properties.
law of conservation of matter/massmatter cannot be created or destroyed; in a chemical reaction, this means that the number and type of atoms in the reactants must equal the number and type of atoms in the products
atomsmallest unit of an element that still has the properties of that element
moleculesmallest unit of a compund that still has the properties of that compound; at least 2 atoms bonded together
solutionhomogenous mixture of 2 or more substances; example: salt-water
dissolvingthe process in which particles of substances separate and spread evenly throughout a mixture
homogenous mixturea mixture with all parts evenly mixed throughout; it looks like on substance
heterogenous mixturea mixture that is very unevenly mixed, different parts of the mixture are visible
productsin a chemical reaction, the compounds or elements that are produced by the reaction
reactantsin a chemical reaction, the compounds or elements that enter into the reaction
massamount of matter in an objects, measured in grams or kilograms
flammabilitya chemical property that describes how well a material reacts to burn with oxygen
solubilitya physical property that describes how well a material dissolves into another material
characteristic propertya physical or chemical property that can be used to identify a substance; it does not vary with the amount of the substance; ex: boiling point, ,flammability, solubility


8th grade science teacher
Dover-Sherborn MS
Dover, MA

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