Chemistry 103 Lecture 17

Bonds Ionic Bonds - electron transfer process. Typically between a metal and a nonmetals Covalent Bonds - electrons shared. Typically involving nonmetals.

Chapter 5 & 6 - Ionic Compounds Ionic Radii Ionic Bonds defined Lewis Symbols Lewis Diagrams Nomenclature Polyatomic Ions NaCl (Sodium Chloride)

Chapter 6 & 7 - Covalent Systems Molecules - Molecular Compounds & Elements Covalent bonding Lewis Structures Properties of Bonds Valence count Nomenclature Bond Polarity/Electronegativity CH 4 (methane)

Lewis Structures/Nomenclature NH 4 Cl

Bond Polarity Which pair of atoms will form the most polar bonds? a. C,N b. C,O c. C,F d. C,C e. all are equal

Chapter 8 - Chemical Quantities Molecular and Formula Masses The Mole (Molar Mass & Avogadro’s number) Percent Composition Dalton’s law of Definite Proportions Empirical/Molecular Formulas

Mathematics of Chemistry Which contains more oxygen atoms: 0.50 moles of H 2 O, 15 g of NO 2, or 3.0 x molecules of SO 3 ? A. H 2 O B. NO 2 C. SO 3

Mole Problems A sulfur oxide (contains only S and O) having 50.0% by mass sulfur might have which molecular formula(s)? a. SOb. SO 2 c. S 2 O d. S 2 O 4 e. both SO 2 or S 2 O 4

Chapter 9 - Chemical Reactions Chemical Equations Balancing Reactions Types of Chemical Reactions

Balancing Chemical Equations When the equation: K(s) + H 2 O(l) ---  KOH(aq) + H 2 (g) is balanced, the sum of the coefficients is ___? a. 4b. 5c. 6d. 7e. 8

Chemical Reactions Predict the products of the following (unbalanced) reaction: Mg(NO 3 ) 2 + Al(OH) > a. MgH 2 and Al(ONO 3 ) 3 b. Mg(OH) 2, Al(NO 2 ) 3 and O 2 c. Mg(OH) 2 and Al(NO 3 ) 3 d. Mg(OH) 2, Al 2 O 3 and NO 2

Chapter 10 - Stoichiometry Basic Stoichiometry  Moles  Grams Limiting Reactant  BEFORE vs AFTER  Left over Reactant Percent Yield

Stoichiometry The overall chemical equation for the photosynthesis reaction in plants is 6CO 2 + 6H 2 O -----> C 6 H 12 O 6 + 6O 2 a. How many grams of sugar can be produced from 25.0g of CO 2 and 25.0g of H 2 O? b. After the reaction has run to completion, how many grams of the remaining reactant are left over?

Stoichiometry Consider the reaction: 3K 2 MnO 4 + 4CO 2 + 2H 2 O > 2KMnO 4 + 4KHCO 3 + MnO 2 When 9.50 moles of K 2 MnO 4, 7.20 x molecules of CO 2 and 90.0g of H 2 O are mixed, a 173g quantity of MnO 2 is actually produced in the lab. What is the percent yield of MnO 2 based on the limiting reactant concept?