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Biology 181 Lab Biology 181 Lab TA: Heidi Ma [email protected] Section 55 Office Hours: Tuesday 9:30- 10:30 AM Koffler 422

Biology 181 Lab

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Biology 181 Lab. TA: Heidi Ma [email protected] Section 55 Office Hours: Tuesday 9:30-10:30 AM Koffler 422. Office Hours. I’m only in my office hours if you ask me to be I am more than willing to meet personally with you on another day if you need. A Little About Me…. - PowerPoint PPT Presentation

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Page 1: Biology 181 Lab

Biology 181 LabBiology 181 LabTA: Heidi Ma

[email protected] 55

Office Hours: Tuesday 9:30-10:30 AM Koffler 422

Page 2: Biology 181 Lab

Office Hours

I’m only in my office hours if you ask me to be

I am more than willing to meet personally with you on another day if you need

Page 3: Biology 181 Lab

A Little About Me…A Little About Me…

I’m an undergraduate just like you.

I’m a Biology Major with a minor in Ecology and Evolutionary Biology.

I’m from Tempe, AZ.

Page 4: Biology 181 Lab

A Little About You…A Little About You…NameYear in SchoolMajorHow much music on your iPod is

illegally downloaded

Page 5: Biology 181 Lab

Course Homepage

http://blc.arizona.edu/courses/181labor

http://www.mcb.arizona.edu/courses/181lab

Page 6: Biology 181 Lab

Important Tabs

Course homepage◦Instructor Tab◦Section 55 under my picture◦Access to class calendar and links to assignments

Page 7: Biology 181 Lab

Course Software

ADOBE SHOCKWAVE PLAYER◦Course Homepage◦Software Tab◦Left Column under “General” Find “Get Shockwave” link and

download program

Page 8: Biology 181 Lab

Course SoftwareBio181L_GO

◦Is a folder that contains all the programs you will need for homework

◦Course Homepage Software Links for “MAC” and “WIN” at top of page

◦DOWNLOAD AND KEEP!!!!◦This is how you will access your

homework

Page 9: Biology 181 Lab

Course Software

Bio181L_Go package◦Has various homework assignments◦The most important one is

ASSESSOR This contains the majority of your online

tutorials

Page 10: Biology 181 Lab

Syllabus

Course homepage- link is in right column

READ for next week◦Questions from syllabus included on next week’s quiz and this week’s homework

Page 11: Biology 181 Lab

Asya RobertsAsya handles absences- not meIf you know in advance you will

miss a lab, see her IMMEDIATELY BSE Room 109, Mon-Fri: 800AM-

200PM is her general schedule

Page 12: Biology 181 Lab

Plagiarism Contract

Page xiii of Lab Manual◦Sign and return to me by beginning of lab next week

◦Having a signed syllabus will be 10 points of your first quiz

Page 13: Biology 181 Lab

HOMEWORKOnline assignments due by 10:00 PM the night before lab

CARE NOW!!!! Not at the end of the semester……

Page 14: Biology 181 Lab

Weekly QuizzesQuiz in the first ten minutes of class every week

Used as late penalty Material covers current day’s lab and concepts you need to complete the lab

READ lab manual….it will save time

Page 15: Biology 181 Lab

Create 181L AccountHomepageLeft Column- MCB 181L

Homework Account

Enroll in your section 55Create a password and WRITE IT

DOWN- this is what you will use the rest of the course

Page 16: Biology 181 Lab

LAB 1: MOLECULAR TAO

Page 17: Biology 181 Lab

The World is made of Atoms Made up of protons, neutrons,

and electrons

Page 18: Biology 181 Lab

Review of Terminology

Nucleus (the center)= protons (+ charge) and neutrons (neutral charge)

Electrons (- charge) - rotate AROUND the nucleus

Page 19: Biology 181 Lab

Coloring Your WorldColoring Your World

Page 20: Biology 181 Lab

Periodic Table of Elements (0-1 Lab Manual)The number below the elemental symbol refers to the amount of PROTONS in the nucleus◦This EQUALS THE NUMBER OF ELECTRONS rotating about the nucleus

◦This is meant to BALANCE THE CHARGE

Page 21: Biology 181 Lab

BUT

Atoms “prefer” to have EIGHT electrons in their outermost shell- based off a mathematical model

This fact is what characterizes how atoms will BOND with other atoms….creating a MOLECULE (many atoms)

Page 22: Biology 181 Lab

ReviewThe rings around the atoms are a

way to depict “orbitals” or the “electron shell” – which is the space where electrons reside

Atoms like to have EIGHT electrons in their OUTERMOST orbital or electron shell (EXCEPT HYDROGEN AND HELIUM)

Page 23: Biology 181 Lab

Electronegativity

A characteristic that describes how BADLY an atom wants an electron

This property determines how the atom will bond and HOW MANY bonds it will make

Page 24: Biology 181 Lab

The GENERAL trend

Page 25: Biology 181 Lab

How badly do atoms want electrons?

The CLOSER an atom is to having the full eight electrons in the outer shell, the MORE they want electrons= the more electronegative they are

Elements are organized into columns on the PTE to denote how many electrons are still needed

Page 26: Biology 181 Lab

Everyone wants to be a noble gasEvery atom seeks to be like the

gases in the right hand column of the periodic table

These elements already have eight electrons in the outer shell

The column number indicates how many more electrons the element needs to have eight total

Page 27: Biology 181 Lab

How many bonds?However many electrons are

missing from the outer shell is how many bonds the atom will make

EX: Nitrogen- in column 5, meaning it needs 3 more electrons, meaning it will bond 3 times

NH3 Ammonia

Page 28: Biology 181 Lab

Example: Ammonia

Page 29: Biology 181 Lab

BondingCovalent IonicHydrogen interactions These are discussed in GREAT

DETAIL in your homework- this review will be BRIEF

Page 30: Biology 181 Lab

Covalent Bonding

The SHARING of electronsIf an atom needs more electrons

to reach the desired eight, it BONDS to another atom

Page 31: Biology 181 Lab

Example

Page 32: Biology 181 Lab

Polar vs. Nonpolar CovalentThis is a VERY essential concept

to being successful in this course and understanding today’s exercise

Page 33: Biology 181 Lab

PolarThe electrons shared in the

covalent bond spend MORE TIME ROTATING ABOUT THE MORE ELECTRONEGATIVE ATOM

UNEQUAL SHARING OF ELECTRONS BETWEEN ATOMS

Results in partial charges on each atom

Page 34: Biology 181 Lab

THE Example: Water

Page 35: Biology 181 Lab

What creates the charge?How many protons does oxygen

have?How many electrons does oxygen

have?How many does it have if the two

electrons from water is rotating around it? Is this a charge balance?

Page 36: Biology 181 Lab

Polar Interactions

Molecules with polar covalent bonding tend to be attracted to OTHER molecules with polar covalent bonding

Why? Because charges attract each other

Page 37: Biology 181 Lab

Nonpolar

EQUAL SHARING OF ELECTRONSThis occurs most regularly in

molecules with a lot of C – H bonds

Carbon and hydrogen have the same electronegativity- no partial sharing

Page 38: Biology 181 Lab

Example:

Page 39: Biology 181 Lab

Nonpolar interactionsThere are none. There is no

partial charge to be attracted to anything

Nonpolar substances don’t care about anyone

Oils are common examples

Page 40: Biology 181 Lab

Ionic BondingArises due to the attraction of

opposite charges One atom steals the electron= has

total ownership over electron

Page 41: Biology 181 Lab

Hydrogen “Interactions” Happens BETWEEN molecules Does NOT MEAN A BOND WITH

HYDROGENIs the INTERACTION of hydrogen

with an electronegative atom, such as oxygen, nitrogen, or fluorine

Example: Network of water molecules

Page 42: Biology 181 Lab
Page 43: Biology 181 Lab

Today’s Lab Activity

Computer desktops- Lab 1 Tao Stack Exercise

Work in groups of 3-4

Page 44: Biology 181 Lab

Discussion Points

Why did water “bead up” on wax paper?

Why did adding salt to the alcohol mixtures create a layer for the propanol mixture?

Why did the pepper flakes “flee” the toothpick dipped in detergent?

Page 45: Biology 181 Lab

CLEAN UPThis is your responsibility, not the

prep staff’sPlease return everything at your

station back to normal Bio 181L homepage- bottom right

link says “weekly cleanup”- follow that

Page 46: Biology 181 Lab

Homework for next weekSigned plagiarism contractAssessor: “181 Lab Intro”Assessor: “Molecular World

Tutorial” “Atoms and Molecules”

◦Crosswords OR OR OR VocabuWary

◦VIA BIO181_ GO package

Page 47: Biology 181 Lab

For HomeworkYou must download the

BIO181_GO package and access the homework there

OR access it via the Software tab on the website, but downloading the package works better

The website is less secure, it functions slower than the BIO181L_GO package

Page 48: Biology 181 Lab

Next Week’s QuizNext Week’s Quiz

Next week’s quiz will includeConcepts from today

Atom colorsDeducing partial charges (from

tutorial)