Creating a Positive Learning Environment for Everyone Be respectful of your classmates Save conversation for clicker portions of lecture Put cell phones in “airplane” mode Turn off tablets Close laptops

Friday Sections Smaller groups, more details in solving problems. You must take an active role. Textbook Ch. 2 and 3 HW due tomorrow (p. 12 of Lab Book lists the exact problems to be completed)

LON-CAPA Electronic Homework Can access from course website: www.chem.illinois.edu Prelecture Assignment due Tuesday 9/5, 8 am HW 1 Type 1 due Tuesday 9/5, 7:00 pm (Mondays) Type 1 HW – “unlimited” attempts (99) Type 2 HW – 5 attempts (Wednesdays) Prelecture Assignments – 2 attempts - read the textbook sections first! (Tuesdays & Thursdays!)

Syllabus Page 13 Type 1 HW 1 Moved to Tuesday 7 pm

LON-CAPA Electronic Homework Receive no credit after due date. Individualized assignments. Show them Lon-Capa!!!!!!!!!!!!!!!!!!!

Lectures Provide a “big picture” Lecture Syllabus Interactive How do we think about “science”? How do we solve a problem? Lecture Syllabus Page 10 of Lab Book Interactive I expect and encourage questions. Participation expected through clickers.

Let’s Give it a Try… How has your first week been going? Sulfur so good I zinc I can, I zinc I can Sodium difficult Pretty boron Oxygen Potassium

Clicker Points Participation Points – answer at least 75% of the questions per lecture 0.5 points per lecture Capped at 10 points (24 lectures w/ clickers) Bonus Points – earn 0.1 points for every question you answer correctly Starts Next Tuesday

Chemistry 101 Slower pace after next week Office hours – 2026 Chemistry Annex 10-11am Tuesdays and Thursdays By appointment emccarr2@Illinois.edu

Chemistry 101 2021 Chemistry Annex (Chemistry Learning Center) Walk in tutors Office hours Reference materials

General Email Advice…

To: emccarr2@illinois.edu From: 2hot4u@gmail.com I dont get problem 3 Srsly, plz help thx ~J

Email Advice Acknowledge instructor’s name. Put your name. Use @illinois email account if possible. (otherwise put netid after name) Do not use “text message” code. Put your section. Do not erase the message I sent previously (the email record).

To: emccarr2@illinois.edu From: jdoe25@illinois.edu Hi Elise, I am having trouble understanding problem #3 of the Additional Questions on pg. 23 of the Lab Book. How am I supposed to make my drawings for each measurement? Can you please give me some guidance? Thanks! -Jane (jdoe25, ADM, Chem 101)

A Particle Story: Smelly Particles

Smelly Particles

Particulate Nature of Matter Atom: smallest part of an element that is still that element (fundamental unit of which elements are composed). Molecule: Two or more atoms joined and acting as a unit. (element or compound)

Clicker Question How many of the following are compounds? S8, NO2, KCl, CH4, H2SO4 A) 1 B) 2 C) 3 D) 4 E) 5

Atomic Element

Molecular Elements

Compounds

Clicker Question… How many of the following are compounds? S8, NO2, KCl, CH4, H2SO4 A) 1 B) 2 C) 3 D) 4 E) 5

Chemical Reaction

Chemical Change A change in the fundamental components of the substance. Create something new/different Chemical changes are called reactions.

Macroscopic versus Microscopic

Physical Change A change in one or more physical properties, but no change in the fundamental components. Changes of State

Clicker Question How many of the following are examples of a chemical change? I. burning of wood II. pulverizing (crushing) rock salt III. dissolving of sugar in water IV. melting a popsicle on a warm summer day A) 0 B) 1 C) 2 D) 3 E) 4

Clicker Question Which of the following is a homogeneous mixture? A) potting soil B) sodium chloride (table salt) C) pure water D) oil and vinegar dressing E) sports drink (like Gatorade)

Significant Figures 0.0005670 540,000 235.0 100. 1,230,400 0.0456 Non-zero digits and “middle” zeros are significant. Beginning zeros are never significant. End zeros significant with a decimal.