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Chemical/Physical Ch

6.5C/7.6A Chemical & Physical Changes

TermDefinition
ELEMENT Pure substance composed of the same type of atom throughout.
COMPOUND Substance made of 2 or more elements that are chemically combined in fixed amounts.
PROPERTIES Physical & chemical characteristics of matter used to describe or identify a substance.
STATES OF MATTER Distinct forms of matter known in everyday experience: solid, liquid, & gas; also referred to as phases.
PRODUCTION OF HEAT OR LIGHT Evidence of release of energy during a chemical change.
PRODUCTION OF PRECIPITATE Evidence of a new substance formed from a chemical change, resulting in solid particles that form or separate out of a liquid.
PRODUCTION OF GAS Evidence of a new substance formed from a chemical change.
SUBSTANCE Any form of matter that is uniform throughout & has consistent properties.
COLOR CHANGE Change in the way something reflects light, can indicate a chemical change.
TEMPERATURE CHANGE Increase or decrease of heat energy in a substance may be evidence of a new substance formed during a chemical change.
MATTER Anything that has mass & takes up space.
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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