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made up of 1 type of atom; a substance that cannot be decomposed into a simpler substances by any chemical or physical process
2 or more elements chemically bonded together; have properties that are different from the elements that make them up, can be further decomposed into simpler substances by chemical reaction
a combination of 2 or more substances, each compound in the mixture retains its own set of chemical and physical properties; can be separated by physical means
indicates the same; same uniform appearance and composition throughout; cannot see different parts; a solution is a homogeneous mixture
indicates the difference; uneven distribution of substances; a mixture that consists of physically distinct parts, each with different properties
can be observed by changing the identity of the original substance; shows how substances can form new substances
a change in any physical property of a substance, but not in the substance itself; identity remains the same
molecules, CO2 (carbon dioxide), H2O (water), (di-hydrogen oxide), NaCl (salt), C12H22O11 (sodium clouride), (sucrose) (sugar)
examples of compounds
color, shape, density (mass, volume), size, texture, melting point, and boiling point
examples of physical properties
flammability, reaction with oxygen, ability to rust, reaction with acid, base
examples of chemical properties
formation of gas, formation of solids or precipate, change in color, change in energy due to a change in temperature, production of odor
examples of chemical change
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