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

CH4 (methane)

Lewis Structures/Nomenclature NH4Cl

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 H2O, 15 g of NO2, or 3.0 x 1023

molecules of SO3?

A. H2O

B. NO2

C. SO3

Mole Problems

A sulfur oxide (contains only S and O) having 50.0% by mass sulfur might have which molecular formula(s)?

a. SO b. SO2 c. S2O

d. S2O4 e. both SO2 or S2O4

Chapter 9 - Chemical Reactions Chemical Equations

Balancing Reactions

Types of Chemical Reactions

Balancing Chemical Equations When the equation:

K(s) + H2O(l) --- KOH(aq) + H2(g) is

balanced, the sum of the coefficients is ___?

a. 4 b. 5 c. 6 d. 7 e. 8

Chemical Reactions

Predict the products of the following (unbalanced) reaction:

Mg(NO3)2 + Al(OH)3 ----->

a. MgH2 and Al(ONO3)3

b. Mg(OH)2 , Al(NO2)3 and O2

c. Mg(OH)2 and Al(NO3)3

d. Mg(OH)2 , Al2O3 and NO2

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

6CO2 + 6H2O -----> C6H12O6 + 6O2

a. How many grams of sugar can be produced from 25.0g of CO2 and 25.0g of H2O?

b. After the reaction has run to completion, how many grams of the remaining reactant are left over?

Stoichiometry

Consider the reaction:

3K2MnO4 + 4CO2 + 2H2O -------->

2KMnO4 + 4KHCO3 + MnO2

When 9.50 moles of K2MnO4, 7.20 x 1024 molecules of CO2 and 90.0g of H2O are mixed, a 173g quantity of MnO2 is actually produced in the lab. What is the percent yield of MnO2 based on the limiting reactant concept?