Preparation and Properties of Buffers
Done November8, 2014
Purpose:
The purpose of this lab is to prepare and examine the properties of buffer solutions and to
determine the buffer capacity of a buffer solution.
Procedure:
For part one: 25 ml of .20M acet
The Chemistry of Iron
Done October 25, 2014
Purpose:
For part one of this lab: The purpose is to find the equilibrium constant of the reaction Fe 3+
And SCN- by using the b found from the past lab and by finding the absorbance of the reaction
for this lab
CALCULUS OF A VASE PROJECT
Done October 18, 2014
Physical measurements:
To measure the vase and find points on the vase we used a tape measurement and created a
number line (in centimeters) on our vase starting from the bottom (point 0) and going to the r
CALCULUS OF A VASE PROJECT
Done October 18, 2014
Physical measurements:
To measure the vase and find points on the vase we used a tape measurement and created a
number line (in centimeters) on our vase starting from the bottom (point 0) and going to the r
Determination of Electrochemical Series
Purpose:
The purpose of this lab is to determine the reduction potential of several metals and the
combinations of their half cells.
Procedure:
Using filter paper for a good conductor, copper plus copper sulfate, zi
ACID BASE TITRATION
Done October 31, 2014
Purpose:
The purpose of this lab is to find the concentration of an acid through acid-base titration.
Procedure:
Obtaining a beaker used for titration, 50 ml of distilled water was poured into the beaker and
then
CHM142
Elgin Community College
Memorization Guide
Dr. Trail
Some facts that you need to know for CHM142
CONVERSIONS:
English:
Mass:
16 oz = 1 lb
2000 lb = 1 ton
Length:
12 in = 1 ft
3 ft = 1 yd
Volume:
32 oz = 1 qt
4 qts = 1 gallon
5280 feet = 1 mile
With
CHM142
Dr. Trail
Chapter 3 Worksheet warmup problems
1. Calculate the formula mass for the following
CH4
H2O2
Al2(SO4)3
Mg3N2
2. Calculate the number of objects (atoms, molecules etc.; the respective objects are underlined) in each
of the following:
1g of
CHM142
Elgin Community College
Dr. Trail
Your Name_
Quiz 5a (20 pts) WORK MUST BE SHOWN FOR CREDIT!
E = m c2
E= h
c =
1. (4 pts)
Which one of the following types of radiation has the
shortest wavelength, the greatest energy, and the highest frequency?
a
Dr. Trail
Enthalpy of Hydration Lab Data Sheet
Name _
Salt _
_ mL vol H2O
_ g
salt
H2O
cup
_ g
_ g
_ moles salt
_ C T1
_ C T2
_ C
T
_ g
_ g
cup
mass solution
_ J/g/C specific heat
capacity solution
_ J/g/C specific heat
capacity calorimeter
qsoln
qcal
_ J
HCl
HClO
HClO2
HClO3
HClO4
anion
ClClOClO2ClO3ClO4chlor
hypo chlor
chlor
chlor
per chlor
name
ide
ite
ite
ate
ate
hydro chlor ic acid
hypo chlor ous acid
chlor ous acid
chlor ic acid
per chlor ic acid
ox state
-1
+1
+3
+5
+7
Cl, Br, I, At, and Mn *dont me
CHM142
Elgin Community College
Dr. Trail
Ideal Gas Law Problems
Use the ideal gas law to solve the following problems:
1)
If I have 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 liters, what
is the temperature?
2)
If I have an unknown quant
Ac
U
Pu
W
Re
Os
Ru
Ir
Rh
Pt
Pd
Ni
Cu
Zn
Au
Ag
Hg
Cd
Ra
Ta
Tc
Co
Fr
Hf
La
Mo
Fe
Ba
Nb
Mn
Tl
In
Ga
Pb
Sn
Ge
Bi
Sb
As
Po
Te
Se
At
I
Br
Rn
Xe
Kr
Ar
Cs
Zr
Y
Cr
Cl
Sr
V
S
Rb
Ti
Sc
P
Ca
Si
K
Al
Mg
F
Na
N
Ne
C
Li
B
Be
H
Periodic Table of the Elements
O
He
Elgin C
CHM142
Elgin Community College
Dr. Trail
The Ideal and Combined Gas Laws
Use your knowledge of the ideal and combined gas laws to solve the following problems.
1)
If four moles of a gas at a pressure of 5.4 atmospheres have a volume of 120
liters, what is
CHM142
Elgin Community College
Dr. Trail
Charles Law Worksheet
1)
The temperature inside my refrigerator is about 40 Celsius. If I place a balloon in
my fridge that initially has a temperature of 220 C and a volume of 0.5 liters, what
will be the volume o
CHM142
Elgin Community College
Dr. Trail
Boyles Law Problems
Use Boyles Law to answer the following questions:
1)
1.00 L of a gas at standard temperature and pressure is compressed to 473 mL.
What is the new pressure of the gas?
2)
In a thermonuclear devi
Chapter 5 Practice Problems
Q1 Potential and Kinetic Energy.
Calculate the kinetic energy of a 3.1 10-5-g object with a velocity of 2.0 105 cm/s.
Q2 Heat and Work.
Calculate E for each of the following.
a. q = -54. kJ, w = +92. kJ
b. q = +82. kJ, w = +54.
Lab Math Avogadros #
Prelab/Postlab Confusion
Volume has what units?
_
cm3
Area has what units?
_
cm2
a) calculate total volume of one drop
cm
b) Calculate volume of oleic acid in one drop (which is
the amount of oleic acid that appears in the solution)
Q
CHM142
Elgin Community College
Dr. Trail
Solving Gas Problems
There are basically two types of gas problems:
1) the gas is under ONE set of conditions
In this case, you have PV = nRT
You always know R
that leaves four things:
P = pressure
V = volume
n = m
Examples
How do molecular* materials
dissolve? (*covalent)
solvent
solute
salt water
rum and coke
engine coolant
syrup
white gold
oxygen/water
19
20
Electrolytes solutes that conduct
electricity
Svante Arrhenius (1859-1927) Sweden
Measured flow of electr
Volume Percent
Weight (or Mass) Percent Examples
How much ethanol is contained in a can of beer?
A football player weighs 300 lbs
He has 20% body fat
How many pounds of fat does he have?
330 mL volume
5% (v/v)
What is the mass percent of aspirin when 5.02
Chemistry 142-120 Dr. Trail Tuesday Sept 18
Lab Math
Copper Chloride Lab data and postlab due tonight
Periodic Trends Lab prelab due tonight
data and postlab due 9-25
Volume has what units?
_
Avogadros Lab prelab due Thursday due 9-25
Area has what uni
Roentgen -1895
Roentgen -1895 discovered X-rays
considered perhaps one of the greatest scientific
discoveries ever.
enabled photos of the inside of the human body
enabled fundamental studies of matter
Becquerel 1896 discovered radioactivity
Becquerel 1
Empirical Formula Calculation
Empirical Formula - nasty number
2.38 g Uranium metal is heated in air and forms a white powder
weighing 2.86 g.
2.38 g Uranium metal is heated in air and forms a white powder
weighing 2.65 g.
What is the empirical formula of
The Mole
Molar Mass
A substances molar mass (molecular weight) is
the mass in grams of one mole of the compound.
The number equal to the number of carbon
atoms in exactly 12 grams of pure 12C.
C?
1 mole of anything = 6.022 1023 units of
U?
that thing
H2 O
Chm 142-120 Dr. Trail Tuesday August 28
Chapter 2 What should you know/be able to do?
History of Chemistry
Fundamental Chemical Laws
HW 1 (Webassign) and Read Chapter 1 Due August 31 11:55pm
Conservation of Mass - Lavoisier
Definite Proportions - Proust
Measurements
Nature of Measurement
Relationships can be qualitative.
The Sears Tower is higher than our Science Bldg.
Illiteracy contributes to poverty.
I am shorter than Jason.
I am shorter than Ann.
Measurement
- quantitative observation with 2 parts
Pa
Chemistry 142-120 Dr. Trail Tuesday Sept 4
Chapter 3 Stoichiometry
Density Lab and post lab due tonight
A) Be able to calculate molecular weights or molar mass.
What is Avogadros Number? What is a mole? What is
molar mass?
Naming Lab no prelab
HW 2 (We