Reaction Predictions ! !

Types of Chemical Reactions  Single Displacement  Double Displacement  Decomposition  Synthesis  Combustion

Single Displacement A +BC  AC + B One element shoves the other element out!

Example 1: Ca + AlCl 3  CaCl 2 + Al

Example 2: AlCl 3 + K 

Example 3: Zn + FeCl 2 

What do metals have to do with reaction predictions? Metals vary in reactivity Lose electrons in a reaction AND give the electrons to someone else Metal’s ability to give electrons depends on how reactive the metal is How easily/quickly the metal wants to give up its electrons

Activity Series of Metals Metals listed and arranged according to reactivity. Metals will displace other metal ions in a solution from any metal BELOW it Generally, Metals > H 2 on activity series will produce hydrogen gas (H 2 ) when combined with an acid Metals < H 2 cannot produce hydrogen gas (H 2 ) from an acid

Example 1: Predict the products Mg (s) + Cu +2 (aq)

Example 2: Predict the products. Ag (s) + Cu +2 (aq)

Example 3: Predict the products. Al (s) + H + (aq)

Example 4: Predict the products. Ag (s) + H + (aq)

Double Displacement AB + CD  AC + BD Elements switch partners !

Example 1: Na 3 PO 4 + BaCl 2  Ba 3 (PO 4 ) 2 + NaCl

Example 2: K 3 PO 4 + MgSO 4 

Decomposition AB  A + B Breaking chemical compound up, going from BIG to SMALL !

Example 1: Au 2 O 3  Au + O 2

Example 2: H 2 O 

Synthesis A + B  AB Joining! Making new chemical compound !

Example 1: Mg + N 2  Mg 3 N 2

Example 2: Be + Cl 2 

You Pick Two

Combustion HYDROCARBON (compound made up of just Cs and Hs) + O 2  CO 2 + H 2 O Chemical reactions involve a compound burning.

Example 1: C 2 H 6 + O 2  CO 2 + H 2 O

Example 2: Propane (C 3 H 8 ) burns

Gandalf combines aluminum metal with sodium hydroxide in solution. What does he produce?]======

Practice  Zinc metal combines with hydrochloric acid (HCl).  Sodium sulfide combines with magnesium oxide.  Calcium oxide breaks down.  C 4 H 8 burns