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Quiz #8 Chemical Rxns and Safety

Why is it important to wear goggles during lab? What is the correct way to write the formula for Chlorine? In the formula Na 3 PO 4 What elements are present? How many of each element is present in the formula of sodium phosphate (in question 3)? Balance the following:

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Quiz #8 Chemical Rxns and Safety

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  1. Why is it important to wear goggles during lab? What is the correct way to write the formula for Chlorine? In the formula Na3PO4 What elements are present? How many of each element is present in the formula of sodium phosphate (in question 3)? Balance the following: __N2 + __H2 __NH3 What does H2O (g) symbolize? Predict the following reactions: __K + __Cl2______ __ MgCO3 ________ + _______ __ Ba + __CuSO4 ______ + ____ To protect your eyes. H2 sodium, phosphorous, oxygen 3 Na, 1 P, 4 O N2 + 3 H2 2 NH3 gaseous water (steam) 2 K+ Cl2  2 KCl MgCO3  MgO + CO2 Ba + CuSO4  BaSO4 + Cu Quiz #8 Chemical Rxns and Safety

  2. Practice: Single Replacement Less active  • Lithium Fluorine • Potassium Chlorine • Barium Bromine • Strontium Iodine • 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 • Mg + H2SO3 • Fe + 3 H2SO3  • Zn + CuSO3  • Cu + ZnSO3  • Ni + PbSO3  • Sn + PbSO3  • Fe + 3 Ag2SO3  H2 + MgSO3 3 H2 + Fe(SO3)3 Cu + ZnSO3 No reaction Pb + NiSO3 SnSO3+ Pb Fe2(SO3)3 + 6Ag

  3. O O N N O O O O Formation of a precipitate + + I Pb2+ I Na Na

  4. Formation of a gas + + S Co2+ Br Br H H

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

  6. 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 NH4+ Compounds containing NO3- Compounds containing CH3COO- (acetates) Chlorides, bromides, iodides (these ions combined with Pb2+, Ag+, Hg22+ form insoluble compounds) SO42- (these ions combined with Pb2+, Ba2+, Sr2+, Hg22+ form insoluble compounds) Generally insoluble (s) Compounds containing OH- or S2- (these ions combined with alkali metals, Ba2+ or the ammonium ion are soluble) Compounds containing CO32- or PO43- (these ions combined with alkali metals are soluble)

  7. Combustion Reactions • A substance combines with oxygen, releasing a large amount of energy in the form of light and heat. 2 H2 (g) + O2 (g)  2 H2O O H O H H H

  8. Combustion Reactions • A substance combines with oxygen, releasing a large amount of energy in the form of light and heat. C3H8 (g) +5 O2 (g)  4 H2O + 3 CO2 O O O O H O H H H C O C C O H O H H O H O

  9. Combustion Reactions • A substance combines with oxygen, releasing a large amount of energy in the form of light and heat. C3H8 (g) +5 O2 (g)  4 H2O + 3 CO2 O O H C O O H H H O H H O C H O O C O O H

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