Chemical Reactions Formulas and Equations Chemical Formulas Element

Chemical Reactions, Formulas, and Equations

Chemical Formulas Element Symbols C 6 H 12 O 6 Subscripts – Number written below and to the right of a chemical symbol. • Shows the number of atoms of each element. Chemical formula - A shorthand notation for a compound or diatomic element. • Shows the elements and how many atoms of each element are in the compound/molecule.

Signs of a Chemical Reaction Clues to chemical reaction 1. Gas Formation 2. Precipitate 3. Color Change 4. Energy Change 5. Sound 6. Light 7. Odor

Chemical Reactions Chemical reaction – a process by which one or more substances undergo a chemical change (React) to produce one or more different (New) substances. • New substances form because chemical bonds break and form new bonds. • Different _____ Physical and ____ Chemical properties • Chemical Reactions are shown by writing chemical equations.

Chemical Equations and Parts REACTANTS 2 H 2 + O 2 Yields PRODUCTS 2 H 2 O Coefficients Chemical Equation – A representation of a chemical reaction where the reactants and products are expressed in formulas Reactants - Starting materials that change Products – New substances formed “Ending Materials” Reactants Products ________ produce the _________. Coefficients – Number placed in front of a formula to balance equations.