Calculating Reaction Yield
The combustion of 58 g of butane (C4H10) yields 158 g of CO2. What is the yield of this
2 C4H10 + 13 O2 10 H2O + 8 CO2
Theoretical yield is 8 moles of CO2 for each 2 moles of butane or, 4 moles of CO2 for each
CHM 3001 Sample Quiz #1
1) Each of the following situations present a potential danger to yourself or another student in the
chemistry laboratory. Briefly explain how (or why) the danger exists and how to correct the
a. picking up a ceramic cru
Determinig Molarity: First step
Sum of the atomic weights of each element in the compound
What is the molecular weight of Na3PO4?
Step 1: Sodium has an atomic weight of 22.99, but there are 3 molecules
so 22.99*3= 68.97
Units of Measure
Measurement requires a numerical value and a unit
Laboratory results almost always have units of measurement associated with them
length ( meter )
mass ( gram )
quantity ( mole )
Volume ( liter )
Time ( second )
Kinetic Molecular Theory
Gases: More K.E. than liquids or solids.
K.E. is directly proportional to absolute Temperature (T, K).
T increases, K.E. increases
At a given T, every gas has the same K.E. but different speed.
K.E. = 1/2 Mu2 , where
Internal Energy and Enthalpy
For a chemical system at constant pressure, a new State function is defined where: H = E
+PV, where H = Enthalpy
If this system experiences a change (say work is done on it or by it), then H = E + PV.
However, since E
Aqueous Solutions of Acids and Basesor OH- producer
Acid: Accepts a pair of electrons
Base: Donates a pair of electrons
Acids / Bases
A strong acid or base completely dissociates to ions in solution.
Strong Acid: HCl (aq) H+ (aq)
The equilibrium lies to
Chapter 16: Chemical
For intermediate values
(10 < Kc or Kp < 10 ), the
equilibrium mixture contains
appreciable amounts of
both reactants and
For Kc or Kp > 1,
equilibrium lies to the
Exam 2 Review
_ 1. Balancing a chemical equation so that it obeys the law of conservation of matter
coefficients in front of
Changing the formulas of the products and
formulas so there are
the same number
Chapter 18: The Colorful Chemistry of Metals
Lewis Acids and Bases
Lewis acid: electron-pair acceptor
Lewis base: electron-pair donor
Recognize that any Brnsted-Lowry acid is also a Lewis acid, and any Brnsted-Lowry base is a Lewis base.