click below
click below
Normal Size Small Size show me how
Compounds and Elemen
Compounds and Elements
Term | Definition |
---|---|
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 |