Classifying Chemical Reactions

What is a chemical reaction? A chemical reaction is the change of a substance into a new one that has a different chemical identity. Molecules or atoms are rearranged.

Signs of a Chemical Reaction Proof: one or more substances has changed identity – chemical change 1.Evolution of energy as heat and/or light 2.Production of a gas 3.Formation of a precipitate 4.Color change

Synthesis Reactions Two or more substances combine to make one product A + B  AB 2Na + Cl 2  2NaCl

Decomposition Reactions One reactant breaks down into two or more substances AB  A + B Usually require heat, electricity, or light H 2 O  H 2 + O 2

Single Replacement Reactions One element replaces another element in a compound A + BC  AC + B Cu + 2AgNO 3  Cu(NO 3 ) 2 + 2Ag

Double Displacement Reactions AX + BY  BX + AY Two compounds switch ions Usually form a precipitate – a solid Pb(NO 3 ) 2 (aq) + KI (aq)  PbI 2 (s) + KNO 3 (aq)

Combustion Reactions Burning something Combining it with oxygen C x H y + O 2  CO 2 + H 2 O CH 4 + O 2  CO 2 + H 2 O

Classify the type: PbCl 2 + AgNO 3  Pb(NO 3 ) 2 + AgCl ___________________________ NH 3 + HCl  NH 4 Cl ___________________________ Al 2 S 3  Al + S ___________________________ H 2 SO 4 + Fe  H 2 + FeSO 4 ___________________________ C 12 H 22 O 11 + O 2  CO 2 + H 2 O

Create your own chemical reaction cartoon

Requirements: Must include: Synthesis, Decomposition, Single Replacement, and Double Replacement Cartoon. All four should be placed on the front of a sheet of white paper provided. Each reaction must be labeled. Must be colorful and neat! Each student is required to turn in their own assignment!