Presentation on theme: "Chemical Reactions and Equations. Definition A chemical reaction is the process by which one or more substances change into one or more new substances."— Presentation transcript:
Chemical Reactions and Equations
Definition A chemical reaction is the process by which one or more substances change into one or more new substances whose chemical and physical properties differ from those of the original substances.
Writing a Chemical Reaction Reactants are the elements or compounds you begin with Products are the elements or compounds you end with ReactantsProducts “yield”
Numbers Superscripts show the charge of an ion Subscripts show the # of atoms in a compound Coefficients show the # of molecules H +1 P -3 H 2 O C 6 H 12 O 6 2NaCl 5H 2 O
Fill in the Blanks Reactants Yields Product SubscriptCoefficient
Signs of a Chemical Change A gas is produced A solid precipitate is formed
Signs of a Chemical Change Color Change Temperature Change
Types of Chemical Reactions Synthesis Decomposition Single Replacement Double Replacement Combustion
Synthesis A synthesis reaction starts with two or more reactants and ends up with one product.