Chemistry XXI
Lab Session 1
Working in the CHEM 151 lab.
1
Today’s Agenda
 Meet your classmates and your teacher;
 Review course goals and structure;
 Consent and diagnostic;
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 Safety orientation and training;
 Recognizing chemical substances;
 Working in the lab.
 Required tasks.
2
Let’s Meet
Get together in groups of 3 or 4 people and
introduce yourself:
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Tell the people in your group 3 things you
think they should know about you.
Discuss, as a group, whether you like/dislike
working in the lab.
The person that was born the farthest from
this lab should be ready to introduce
her/himself and the rest of the people in
their group.
Let’s Meet
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Jenine Maeyer
jrcole@u.arizona.edu
OC 218
Chemistry 151
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Chemical thinking allows us to answer many
fundamental questions about:
Substances
Processes
In our world.
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Chemistry 151
The course is designed to help you develop
ways of thinking useful to answer these types
of fundamental questions:
Analysis
What is this?
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Synthesis
How do I make it?
Transformation
How do I change it?
Modeling
How do I explain it?
Human Relevance
The answers to these types of questions are of central
importance in many areas of our personal,
professional, and social life.
Environmental Issues
Analysis
What is this?
Chemistry XXI
Transformation
How do I change it?
Synthesis
How do I make it?
Life and Medicine
Energy Sources
Modeling
How do I explain it?
Materials Design
Chemistry 151
You are expected to develop lab skills and ways of
thinking that can be applied to explain, predict, and
even design the properties and behavior of many
relevant systems.
Global
Warming
Drugs
Nanomaterials
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Alternatives
Ozone
Hole
Food
Polymers
Environmental
Issues
Life and
Medicine
Energy
Sources
Materials
Design
Laboratory Work
All you need to know about the structure and
academic expectations of this Chemistry Lab
is posted in the following website:
Learn About the 151 Lab On-line
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http://quiz2.chem.arizona.edu/genchemlabs/151syllabus
Let’s review the most
important points!
Informed Consent
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Your section of CHEM 151 has been selected
to pilot test a new curriculum approach. In
order to evaluate the success of the project,
your activities in lab and lecture may be
observed on a regular basis by people
associated with the project.
We ask you that you consent to
participate in this project
(observations, and voluntary
focus groups and interviews).
What Do You Know?
To help us craft the best possible class for
your needs we need to know what you
know today.
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To this end we will now administer a
background knowledge assessment.
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Diagnostic Assessment
 This instrument is to be reused in every
class taught in this room. Please do not
mark on the form.
 Your responses will be tallied using a
Scantron machine. Please mark your
answers carefully.
 Enter your name where asked. Leave a
blank space between your last and first
names.
Diagnostic Assessment
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 Enter your student ID number. It MUST be a
nine-digit number. If it is not entered
correctly, your grade will not be recorded. If
your ID number begins with the letter S, enter
a 0 (zero) for the S. When done, your answer
sheet should have nine filled in bubbles
with the last column blank.
 In the space titled “PHONE NUMBER” enter
your three digit SECTION NUMBER for the
“AREA CODE”. Leave the remaining space
blocks empty.
Let’s Start
Let’s take a break
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(5 minutes)
Lab Safety
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Chapter ONE in the lab manual.
It is expected that you will
1) Learn how to be safe in a chemical lab
(what you know);
2) Develop (and demonstrate) safe
laboratory habits (what you do).
You will be evaluated on the quality of your
laboratory habits and practices over the
course of the semester.
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Safety orientation video
The Safety Agreement
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You must agree to abide by our rules and
regulations before we will allow you to
work in our labs.
http://d2l.arizona.edu
Let’s take a
safety tour of our
Lab!
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Recognizing
Chemical Substances
In this lab, you will be
using a variety of
chemical substances.
For your own safety,
YOU MUST recognize
and name them based
on their chemical
formulas.
Nomenclature
Every Chemical MUST have a name that is
1. Unambiguous
2. Minimum number of characters in a
systematic name
Why?
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O
MDMA
N
Ecstasy
O
Why is this better?
C12H17NO2
N,N,2-trimethyl-1,3-benzodioxole-5-ethanamine
Some Trends
The following compounds are called
“BINARY COMPOUNDS”
because their formula include two different
elements
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HBr
HCl
CO
N2 O
PCl3
HI
CO2
N2O4
PCl5
H 2S
CBr4
N2O5
SF6
HBr
HCl
CO
N2O
HI
CO2
N2O4
N2O5
PCl3
PCl5
H 2S
CBr4
SF6
What do these
compounds
have in
common?
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Non-Metals
They are composed of NON-METALS
and said to be COVALENT or MOLECULAR
COMPOUNDS
Some Trends
Let’s look for a trend or system in naming
binary molecular compounds:
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Formula
CO
CO2
CBr4
N2O
N2O4
N2O5
PCl3
SF6
Name
carbon monoxide
carbon dioxide
carbon tetrabromide
dinitrogen monoxide
dinitrogen tetroxide
dinitrogen pentoxide
phosphorus trichloride
sulfur hexafluoride
What are the
rules for
naming
these
molecular
compounds?
Can you see
the pattern?
Rules for Molecular Compounds
1. The name of the element with the lower group
number (furthest to the left) in the periodic table is
the first word in the name (CO, carbon ….)
2. If in the same group, the one with the higher period
number (furthest down) goes first (SO2, sulfur…).
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3. The second element is named with the root and the
suffix –ide (CS2, carbon disulfide).
4. Use Greek numeral prefixes to indicate the number
of atoms of each element (use in first word only if
more than one atom) (CS2, carbon disulfide, CO,
carbon monoxide, N2O2, dinitrogen dioxide)
NaCl
BaI2
KBr
CaO
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Metals
MgCl2
Al2O3
What do these
compounds have in
common?
Metalloids
These are IONIC compounds.
They are composed of
METALS and NON-METALS
Non-metals
Some Trends
Let’s look for a trend or system in naming
binary ionic compounds:
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Formula
NaCl
KBr
MgCl2
BaI2
CaO
Al2O3
Name
sodium chloride
potassium bromide
magnesium chloride
barium iodide
calcium oxide
aluminum oxide
What are the
rules for
naming
these
ionic
compounds?
Can you see
the pattern?
Rules for Ionic Compounds
1. The name of the metallic element is the
first word in the name (NaCl, sodium ….)
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2. The nonmetallic element is named with
the root and the suffix –ide (NaCl,
sodium chloride).
3. No Greek numeral prefixes are used to
indicate the number of atoms of each
element.
Your Turn
Name these compounds: S2Cl2
SrBr2
K2O
SiF4
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Write out the formula of these compounds:
Sulfur trioxide
Tetraarsenic tetrasulfide
What is WRONG with these names?
MgCl2
monomagnesium dichloride
BaF2
barium diflouride
CaO
calcium monoxide
Al2S3
dialuminum trisulfide
Cl2O5
dichloride hexoxide
For more: Consult your lecture text, Tro  p 92-100
Chemistry XXI
Take Five
Japanese businessmen taking a break
at an oxygen bar.
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Overview of a Typical Lab
 Announcements and introduction.
 Small and whole Group discussion:
Students will develop a plan of action.
 Perform experimental procedure.
 Small and group discussion: Students will
evaluate results and determine what to do
next.
 Process will repeat until an acceptable
answer is obtained.
 Small and group discussion: Conclusions
and reflections.
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Solving a Mystery
What questions would
you like to answer?
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Resources
Lab Manual
Group Formation
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 Work stations in the lab are arranged four
to a bench;
 All students working at one bench will be a
group;
 Each work station has an assigned locker;
 When you check into a locker you are also
joining a group.
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Getting Ready
For our next section you need to:
 Complete all pre-lab assignments for
Experiment 1 (Introduction to Measurement)
posted in D2L;
 Complete your “safety agreement” in D2L;
 Complete the “Interests in Chemistry” survey
posted in D2L.
 Write at least one beginning question for the
first lab;
 Print out a report form and bring it to lab.
 Bring at least one laptop with Excell in it
per team.
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Our Next Lab
How do we identify an
unknown substance?
The Challenge
Imagine that you are employed by a
recycling firm.
You have been assigned to devise a
quick and cheap method for identifying
different types of plastics.
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What would you propose to do?
What questions do you need to
answer to complete your task?
Write your ideas in your notebook
before you come to lab.