Quiz #8 Chemical Rxns and Safety 1.Why is it important to wear goggles during lab? 2.What is the correct way to write the formula for Chlorine? 3.In the formula Na 3 PO 4 What elements are present? 4.How many of each element is present in the formula of sodium phosphate (in question 3)? 5.Balance the following: __N 2 + __H 2  __NH 3 6.What does H 2 O (g) symbolize? Predict the following reactions: __K + __Cl 2  ______ __ MgCO 3  ________ + _______ __ Ba + __CuSO 4  ______ + ____ 1.To protect your eyes. 2.H 2 3.sodium, phosphorous, oxygen 4.3 Na, 1 P, 4 O 5.N H 2  2 NH 3 6.gaseous water (steam) 7.2 K+ Cl 2  2 KCl 8.MgCO 3  MgO + CO 2 9.Ba + CuSO 4  BaSO 4 + Cu

Practice: Single Replacement LithiumFluorine PotassiumChlorine BariumBromine StrontiumIodine Calcium Sodium Magnesium Aluminum Manganese Zinc Iron Cadmium Cobalt Nickel Tin Lead Hydrogen Copper Silver Mercury Gold Elements CANNOT replace anything Above them. The reaction does NOT occur in this situation Less active  Mg + H 2 SO 3  Fe + 3 H 2 SO 3  Zn + CuSO 3  Cu + ZnSO 3  Ni + PbSO 3  Sn + PbSO 3  Fe + 3 Ag 2 SO 3  H 2 + Mg SO 3 3 H 2 + Fe( SO 3 ) 3 Cu + Zn SO 3 No reaction Pb + Ni SO 3 Sn SO 3 + Pb Fe 2 ( SO 3 ) 3 + 6Ag

Formation of a precipitate Na I Pb 2+ N O O O N O O O I ++

Formation of a gas Co 2+ S Br H H ++

Formation of Water K+K+ Br H O H ++

Solubility rules These rules are useful for determining: Will a precipitation reaction occur? How can a particular solid compound be created? Will a compound dissolve in water? Generally soluble (aq) Compounds containing alkali metals or NH 4 + Compounds containing NO 3 - Compounds containing CH 3 COO - (acetates) Chlorides, bromides, iodides (these ions combined with Pb 2+, Ag +, Hg 2 2+ form insoluble compounds) SO 4 2- (these ions combined with Pb 2+, Ba 2+, Sr 2+, Hg 2 2+ form insoluble compounds) Generally insoluble (s) Compounds containing OH - or S 2- (these ions combined with alkali metals, Ba2+ or the ammonium ion are soluble) Compounds containing CO 3 2- or PO 4 3- (these ions combined with alkali metals are soluble)

Combustion Reactions A substance combines with oxygen, releasing a large amount of energy in the form of light and heat. 2 H 2 (g) + O 2 (g)  2 H 2 O O H H O H H

Combustion Reactions A substance combines with oxygen, releasing a large amount of energy in the form of light and heat. C 3 H 8 (g) +5 O 2 (g)  4 H 2 O + 3 CO 2 C CC H H H H H H H H O O O O O O O O O O

Combustion Reactions A substance combines with oxygen, releasing a large amount of energy in the form of light and heat. C 3 H 8 (g) +5 O 2 (g)  4 H 2 O + 3 CO 2 C C C H H H H H H H H O O O O O O O O O O