Welcome to Chemistry! My name is Lezlie Haynes and I am the instructor.
5/10–In class–students watched their final apologetics video with me…it was a speech by Dr. Georgia Purdom encouraging them to be bold and speak the truth as they graduate high school and move into the next phase of their lives.
5/3–In class–we finished mod 13 info then performed Exp 13.1. Students are to complete the lab in their student notebook and write a fully formed conclusion. Don’t forget to include % error in the conclusion. Students should show their calculations in each section. No work = pts taken off the grade.
4/26–In class- students took the a quiz over heat then we started Mod 13. We first reviewed how to do Lewis structures. I gave students multiple handouts today to help them with the content. Then, we worked problems the rest of class.
- Make Lewis Structures for each molecule in the chem equation (I gave you a handout)
- Under each molecule, list the different types of bonds formed. EX: C-H bond, or S-O bond
- Next to each type of bond, state how many of this type of bond the molecule has
- Look up the Bond Energy on the handout I gave you EX: C-H bond has 413 kJ/mol
- Do the math: Delta H = Bond Energy of Reactants – Bond Energy of Products
- make sure that EVERY product gets subtracted
- For each molecule: # types of bonds * # moles from chem equation * Bond Energy from table
- I attached an example worked out. If you do not know where I got a number, text me. I double checked everything but you never know.
- Find the Delta H of a chem reaction using bond energies
- Endothermic reactions
- Delta H is positive
- Energy is written as a reactant
- container feels cold
- Exothermic reactions
- Delta H is negative
- Energy is written as a product
- container feels hot
4/19-Before Class–I reviewed how to determine oxidation numbers for redox reactions.
- you get to ignore the calorimeter in this lab
- heat gained by the water is q = mc(Tfinal – Tinitial), c of water is 4.184 J/gC, mass is your mass of water, initial temperature is the temp of the water before adding the metal and final temperature is the max temp the water reached after adding the metal.
- heat lost by the metal is = to the heat gained by the metal, just with a negative sign. -q = mc(Tfinal – Tinitial) where q is the heat from the water, m is the mass of the metal, c is the unknown you are trying to determine, temp final is the same as temp final from the heat gained by water
- if you didn’t write down the percent error formula on the whiteboard, Google it. Theoretical value is the one you have to look up in a table. Experimental value is the one you calculate in lab using your data.
4/12–Gas Law Quiz–for those students that failed the quiz, you have the opportunity to correct each problem and turn the new work in to Ms. Kim next week.
4/5–today was a busy day. At the beginning of class, students turned in their wkst 1. Then, I went over how to balance a redox reaction. I worked about 4 of the big problems then had Ms Kim make copies of my notes so students could have them. After that, students completed a microchem lab on redox reactions. Hwk is to follow the agenda. Since we did a different lab from the one listed on the agenda, complete microchem lab handout and turn in next week. Remember, I added that you were to write the complete redox reactions for each trial. I will use Liv’s handout and make a sample so you know what to do.
3/29–Congratulations to our Middle TN Science and Engineering Regional Fair winners: Moses (3rd), Cheyanne (HM), Daniel (3rd, 2 additional awards), Josiah (2nd, 2 additional awards), Olivia (1st, 2 additional awards), Katie (HM, 2 additional awards), Bella (Broadcom award).
Hwk–follow the agenda.
2/15–today was a good day. Thanks for dressing up for the photographer. In class we covered most of the content of Mod 10, observed a demo, watched a video on supersaturation then worked solution problems involving tgrids and Molarity. I handed out a worksheet on solubility and gave the quiz as a take home. We also watched 2 videos about our St Jude’s fundraiser and listened to Ms. Ellen talk about this wonderful opportunity for our students. Hwk is to follow the agenda and complete the quiz.
2/8–Class went way too fast. I know you guys probably developed cramps in your hand while trying to write what was on the overhead. I have a handout that you can come by and get Tuesday or Thursday that is over the problems we worked in class. The handout consists of practice problems that I have worked out by hand so if you can’t read something, text or email me.
2/7–Olivia has been reminding me daily that #4 on the quiz needs help. So, omit number #4 on the quiz and replace it with this new and improved #4.
4. FeS2 + O2 àFe2O3 + SO2
How many grams of sulfur dioxide are formed when 26.62 grams of FeS2 and 5.44 grams of oxygen react? ((THE REACTION IS NOT BALANCED)
a) Determine the Limiting Reactant
b) Determine the Excess Reactant
c) Determine the grams of sulfur dioxide produced
2/1–In class, we followed the agenda and worked concentration problems, dilution problems and neutralization problems. Hwk is to follow agenda, complete quiz, complete Exp 9.2., work on Extra Practice Problems 1 – 9 (due 2/15), study for first acid quiz.
1/25–In class, we reviewed empirical formulas, molecular formulas and percent composition. Then we began our study of acids and bases. Please click the link(s) below and print the notes. Hwk is to follow the agenda. We did not do lab so no lab report due.
1/18–Class cancelled due to weather.**Updated
- I have added 3 videos to the bottom of this page. They cover the content that we would have covered in class. Please respect my privacy and do not download, share or do anything disrespectful with the video or images within. Important: sometimes you have to let the video format before you can watch. This may take a few minutes. Be patient.
- Watch the videos, take notes, review the Stoichiometry notes over this content
- Check your email for the Stoichiometry Quiz A, and one worksheet over this content
- Due next week:
- Student Notebook Exp 8.1, Stoichiometry Wkst B (Limiting Reactant), Science Fair project (for those doing it), Stoichiometry Quiz A
- Hwk: follow the agenda plus complete the Stoichiometry Quiz A
1/11–In class–we went over limiting reactant problems (I worked several on the overhead, handed out a worksheet for homework that included complete answer key and there are some on the Stoichiometry notes sheet). After taking notes and working problems, students performed Exp 8.1 and shared results.
1/4–Today was a good day in chemistry. In class, students learned about stoichiometry. I went over the concept then worked multiple problems. After that, students worked problems on WKST A (they have a key to check their work). Hwk is to follow the agenda. Make sure the practice problems and OYO’s in the book get worked and checked.
For those interested in the Science Fair or the Honors option which requires a research plan with experimentation:
Welcome to Chemistry!
“This course is designed to be a first-year high school chemistry course and gives the student a rigorous foundation in chemistry, in order to prepare him or her for a college-level course.” Apologia website
Organization is very important and students are required to keep a binder with sections for notes, quizzes/tests, and worksheets. Students should bring their textbook, student notebook, binder, calculator and pencils to every class.
This course has been formatted a little differently from previous Tutorial science classes. I have organized the content into units. Each unit will begin with lecture and a handout that covers the important concepts. For units with math content, multiple examples will be provided. Students will complete the On Your Owns in the textbook as well as Review Questions and Practice Problems. Additional worksheets will be assigned to reinforce difficult concepts or provide additional in-depth practice. Students will be quizzed multiple times per unit and quiz dates will be listed on the agenda. Multiple experiments will be performed that will enhance student understanding of chemistry concepts. Comprehensive final exams will be administered at the end of the fall and spring semesters.
This course has additional content added to enhance the content in the textbook. Serious thought and planning has gone into deciding what content to add and why. All added content will better prepare the student for college level chemistry.
I look forward to seeing each student in the Fall!