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Compounds and Elemen

Compounds and Elements

Chemical change – the formation of a new substance with different properties; cannot be undone by physical means
Compound – a pure substance made by chemically combining two or more elements
Element – a pure substance that cannot be broken down chemically into simpler substances
Physical change – change which alters the physical properties of a substance without changing its identity
Precipitate the solid that is formed as a result of a precipitation reaction
Elements a substance that is not mixed with any other substance
Chemical Symbol: HeliumHe, ,H: hydrogen
Chemical Formula: CO2: carbon dioxide, NaCl: sodium chloride
evidence of chemical change Production of a gas Odor Bubbling Change in temperature Production of a precipitate Precipitate – the formation of solids from a solution
periodic table of elements a display of chemical elements, arranged by atomic number
Created by: Mkh9295