Chemistry XXI 1 Working in the CHEM 151 lab. Lab Session 1

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Working in the Working in the CHEM 151CHEM 151 lab. lab.

Lab Session 1

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Today’s Agenda

Meet your classmates and your teacher; Review course goals and structure; Consent;

Lab structure and expectations; Safety orientation and training; Recognizing chemical substances;

Working in the lab; Required tasks.

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Let’s Meet

Get together in groups of 3 or 4 people and introduce yourself:

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.

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Let’s Meet

Jenine Maeyerjrcole@u.arizona.edu

OC 218

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Chemistry 151

Substances Processes

In our world.

Chemical thinking allows us to answer many fundamental questions about:

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Chemistry 151The course is designed to help you develop

ways of thinking useful to answer these types of fundamental questions:

TransformationHow do I change it?

AnalysisWhat is this?

ModelingHow do I explain it?

SynthesisHow do I make it?

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AnalysisWhat is this?

SynthesisHow do I make it?

TransformationHow do I change it?

ModelingHow do I explain it?

Human Relevance

Life and Medicine

Environmental Issues

Energy Sources

Materials Design

The answers to these types of questions are of central importance in many areas of our personal,

professional, and social life.

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Chemistry 151You 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.

Environmental Issues

Global Warming

Ozone Hole

Life and Medicine

Drugs

Food

Energy Sources

Alternatives

Materials Design

Nanomaterials

Polymers

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Informed Consent

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).

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To help us craft the best possible class for your needs we need determine what you

know about basic Chemistry.

To this end is that we have asked you to complete a diagnostic assessment ( in D2L).

Did you do it?

What Do You Know?

You have until Friday at 11 PM to complete it!

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Laboratory Work

Learn About the 151 Lab On-linehttp://quiz2.chem.arizona.edu/genchemlabs/151syllabus

All you need to know about the structure and academic expectations of this Chemistry Lab

is posted in the following website:

Let’s review the most important points!

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Lab Safety

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

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The Safety AgreementYou must agree to abide by our rules and regulations before we will allow you to work

in our labs.COMPLETE THE SAFETY AGREEMENT

BEFORE FRIDAY AT 11 PM (in D2L).

Let’s take a safety tour of our

Lab!

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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.

Recognizing Chemical Substances

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Every Chemical MUST have a name that is

1. Unambiguous2. Minimum number of characters in a

systematic name

Why?

Nomenclature

C12H17NO2

N,N,2-trimethyl-1,3-benzodioxole-5-ethanamine

O

O

N

MDMA Ecstasy

Why is this better?

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The following compounds are called “BINARY COMPOUNDS”

because their formula include two different elements

HBr HCl HI H2S CO CO2 CBr4

N2O N2O4 N2O5 PCl3 PCl5 SF6

Some Trends

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They are composed of NON-METALSand said to be COVALENT or MOLECULAR

COMPOUNDS

Non-Metals

HBr HCl HI H2S CO CO2 CBr4

N2O N2O4 N2O5 PCl3 PCl5 SF6

What do these compounds

have in common?

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Let’s look for a trend or system in naming binary molecular compounds:

Some Trends

Formula Name

CO carbon monoxide

CO2 carbon dioxide

CBr4 carbon tetrabromide

N2O dinitrogen monoxide

N2O4 dinitrogen tetroxide

N2O5 dinitrogen pentoxide

PCl3 phosphorus trichloride

SF6 sulfur hexafluoride

What are the rules for naming these

molecularcompounds? Can you see the pattern?

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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…).

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)

Rules for Molecular Compounds

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BaI2 CaO Al2O3

These are IONIC compounds.They are composed of

METALS and NON-METALS

Metals Metalloids Non-metals

What do these compounds have in

common?

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NaCl sodium chloride

KBr potassium bromide

MgCl2 magnesium chloride

BaI2 barium iodide

CaO calcium oxide

Al2O3 aluminum oxide

Let’s look for a trend or system in naming binary ionic compounds:

Some Trends

Formula NameWhat are the

rules for naming these ionic

compounds? Can you see the pattern?

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1. The name of the metallic element is the first word in the name (NaCl, sodium ….)

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.

Rules for Ionic Compounds

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Name these compounds: S2Cl2 SrBr2 K2O SiF4

Write out the formula of these compounds:Sulfur trioxide

Tetraarsenic tetrasulfide

What is WRONG with these names?MgCl2 monomagnesium dichlorideBaF2 barium diflourideCaO calcium monoxideAl2S3 dialuminum trisulfideCl2O5 dichloride hexoxide

Your Turn

For more: Consult your lecture text, Tro p 92-100

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Take Five

Japanese businessmen taking a break at an oxygen bar.

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Overview of a Typical Lab Discussion session (lecture-lab exercises); Announcements and introduction to lab

challenge; 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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Lab Manual

Resources

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Group Formation 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 session you need to: Complete the 4 PRE-TERM QUIZZES in D2L (NO LATER THAN FRIDAY AT 11 PM) ; Complete the post-lab quiz (IBIS);

(OPENS FRIDAY & ENDS SUNDAY 11 PM) Complete the pre-lab assignment (posted in D2L) Print out a report form (D2L) and bring it to lab. Bring at least one laptop with Excel in it per team.

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Our Next Lab

How do we identify an unknown substance?

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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.

The Challenge

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.