Chemical Reactions Name: ___________________ Date: ____________ Period: _______ Name: ___________________ Date: ____________ Period: _______

Forming New Substances Chemical reactions form new substances with ____________ properties than the starting substances. Most chemical reactions can be identified with a _________________, but not all! 4 types of reactions: –Synthesis –Decomposition –Single replacement –Double replacement Chemical reactions form new substances with ____________ properties than the starting substances. Most chemical reactions can be identified with a _________________, but not all! 4 types of reactions: –Synthesis –Decomposition –Single replacement –Double replacement

Type of Reaction Definition  Equation Synthesis Decomposition Single Replacement Double Replacement KEY: A = Red B = Blue C = Green D = Yellow A + B → AB AB → A + B AB + C → AC + B AB + CD → AC + BD

Identifying Chemical Reactions ____ P + O 2 → P 4 O 10 ____ Mg + O 2 → MgO ____ HgO → Hg + O 2 ____ Al 2 O 3 → Al + O 2 ____ Cl 2 + NaBr → NaCl + Br 2 ____ H 2 + N 2 → NH 3 2. Use colored pencils to circle the common atoms or compounds in each equation to help you determine the type of reaction it illustrates. Use the code below to classify each reaction. S = Synthesis D = Decomposition SR = Single Replacement DR = Double Replacement

____ Na + Br 2 → NaBr ____ CuCl 2 + H 2 S → CuS + HCl ____ HgO + Cl 2 → HgCl + O 2 ____ C + H 2 → CH 4 ____ KClO 3 → KCl + O 2 ____ S 8 + F 2 → SF 6 ____ BaCl 2 + Na 2 SO 4 → NaCl + BaSO 4

A chemical formula tells the composition of a compound using chemical symbols and subscripts. Subscripts are small numbers written below and to the right of a symbol in a formula. A chemical equation describes a reaction using ______________, _______________, and ____________ A chemical formula tells the composition of a compound using chemical symbols and subscripts. Subscripts are small numbers written below and to the right of a symbol in a formula. A chemical equation describes a reaction using ______________, _______________, and ____________

A balanced equation uses coefficients to illustrate the law of conservation of mass, that mass is neither created nor destroyed during a chemical reaction.