Compounds
Chemical Changes
What is a chemical change?
A chemical change is when something is changed to form a new substance different from the old substances. Chemical changes often forms tarnish, changes color, releases gas, forms a precipitate, or releases energy.
Compounds
A compound is a mix of two or more elements to form a new substance. It is a chemical change.
All compounds have chemical names and formulas.
A chemical name is the name of which substances combine to form the compound. The chemical name for rust(iron and oxygen) is iron oxide.
A chemical formula is the symbol of the elements and the number of molecules per element that make a compound. The chemical formula for rust is Fe2O3.
How chemical changes are used.
Photosynthesis and respiration are two chemical changes used by plants and animals. A space shuttle uses the energy given off by chemical changes to escape earth’s atmosphere. Chemical changes are used in many ways.
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