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7.6A Physical & Chemical Changes

PHYSICAL CHANGE Change to a substance WITHOUT forming a new substance; e.g. breaking substance into smaller particles, changing objects' shape, phase changes, etc.
PHASE CHANGE Type of PHYSICAL change in which: 1. Solids can MELT into Liquids 2. Liquids can EVAPORATE into Gases 3. Gases can CONDENSE into Liquids 4. Liquids can FREEZE into Solids The produced substance is the SAME as the original substance.
CHEMICAL CHANGE Change that alters the identity of a substance, resulting in a NEW substance or substances with different properties; e.g. burning something, exposure to air &/or water, combining different chemicals, pulling compounds apart, etc.
CITY - GIRLS - LEAVE - THEIR - PHONES - ON Mnemonic device to help remember the 6 evidences of a CHEMICAL change: C = COLOR change G = GAS formation (not phase change) L = LIGHT produced T = TEMPERATURE change (not phase change) P = PRECIPITATE formation O = ODOR produced
PRECIPITATE Solid produced when 2 different liquids are combined; the result of a CHEMICAL change.
PHYSICAL PROPERTY Characteristic of a pure substance that can be observed without changing it into another substance.
CHEMICAL PROPERTY Characteristic of a pure substance that describes its ability to change into different substances.
Created by: trauberk
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