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Chemistry Quiz 9/19

Physical Change A change that alters a substance’s appearance, without changing its chemical composition
Examples of Physical Changes Cutting and ripping paper, Molding clay, Crushing an aluminum can, phase changes
Chemical Change A change in which the identities of substances are changed and new substances are formed
Examples of Chemical Changes Iron rusting, Wood burning, Metal corroding, food spoiling, chemical reactions
Chemical Change Key Words Decomposing, rusting, exploding, oxidizing, corroding, tarnishing, reacting, burning, rotting, etc.
Evidence of a chemical reaction Formation of a gas, change in temperature, color change for a reaction
Smallest unit of matter Atom
Physical Properties of Matter Info that can identify and describe matter: color or texture, appearance, density, melting point, boiling point, odor
Chemical Properties of Matter Describes how matter acts during a reaction; reactivity (in acid, in the air), flammability, toxicity
Two Categories of Matter Pure Substances, Mixtures
Pure Substances Matter that has definite chemical and physical properties (elements and compounds)
Element A substance containing atoms of only one type
Diatomic Element A special element found in pairs in nature
Compounds Contain atoms of two or more different elements, chemically combined
Mixtures The addition of 2 or more elements and/or compounds that are not chemically combined
Two types of mixtures Heterogenous and Homogenous
Heterogenous Mixtures Not uniform throughout, ex; mixed peanuts, trail mix, chex mix, a salad
Homogenous Mixtures A substance with uniform composition throughout, the proportion of ingredients remains consistent
Homogenous Solutions Made by dissolving one or more substances (solutes) into another substance (solvent)
Examples of Homogenous Solutions Salt water (solid in liquid), rubbing alcohol (liquid in solid), the air (gases in gases), soda (gas in liquid), bronze (solid in solid)
Created by: MLevy44