Last Days of Chemistry

Last Days of 8th Grade

We will finish strong by completing some of the more interesting and unique labs that make learning chemistry fun and interesting.  Extra Time after labs conclude?  Email me videos to show the class- chemistry and/ or physics phenomenon please!

 

  • Day 1: Uniting Physics and Chemistry
    • The burning tea bag phenomenon.  Why does it rise?
    • Whoosh Bottle: combustion
  • Day 2: Exothermic Reactions and Combustion
    • Carbon Snake
  • Day 3: Emission Spectroscopy
    • The colors that are produced in burning various salts

Monday May 8th

Today students will have time to review their grades.  The last grade for the gradebook will be today’s project- so be in touch before Friday with any questions or late work!

-Review progress report

-Work on the Chemistry Wow Factor Assignment.  Due: Wednesday.  Although this assignment is only worth 9 points, it is weighted as a test grade, so do your best!  Upload your final project (ppt or prezi is best) to this shared folder before Wednesday’s class begins to receive full credit.

The rest of today’s class is independent work time.

 

Exothermic and Endothermic Reactions

Energy Changes in Chemical Reactions

Key Concepts

  • If two substances react and the temperature of the mixture decreases, the reaction is endothermic.
  • If two substances react and the temperature of the mixture increases, the reaction is exothermic.
  • A chemical reaction involves the breaking of bonds in the reactants and the forming of bonds in the products.
  • It takes energy to break bonds.
  • Energy is released when bonds are formed.
  • If a reaction is endothermic, it takes more energy to break the bonds of the reactants than is released when the bonds of the products are formed.
  • If a reaction is exothermic, more energy is released when the bonds of the products are formed than it takes to break the bonds of the reactants

Temperature Change and Chemical Reactions

Today we’ll start with some review relating to how to read chemical formulas, then do a student-led investigation to see to what extent temperature affects chemical reactions.

Then, we’ll start our work with catalysts.  The first example will be Elephant toothpaste, which is a decomposition reaction.  This will be a demo, but students will conduct a student version after the demo (Friday).

Precipitates

Today we will finish the precipitate lab, but first:

  1. Debrief the key concepts learned in this unit and number pages of lab packet.
  2. Make sure everyone is up to date with the element project
  3. Model precipitate formula using candy
  4. Discuss precipitates.  All lab materials live here.

Key Concepts

  • The ions or molecules in two solutions can react to form a solid.
  • A solid formed from two solutions is called a precipitate.

Finally, we’ll head to the lab to see how the precipitate has settled out of the solution and to view a demo.

Assignment for Monday: All elements of the packet 6-1 through 6-3 should be completely filled in.  There will be a surprise lab booklet collection next week at which point materials will be graded.  Please be sure to keep lab booklets in your cubby, ensure they are adequately filled in, and if you miss class, do the lab independently!  All materials are always 100% online as well.

Wednesday we’ll follow up with how temperature affects a chemical reaction- and elephant toothpaste (catalysts)!

Forming a Precipitate

Today we will do a lab on forming a precipitate.  All lab materials live here.

Key Concepts

  • The ions or molecules in two solutions can react to form a solid.
  • A solid formed from two solutions is called a precipitate.

Monday we’ll follow up with how temperature affects a chemical reaction.

The morning will be busy with our field trip to UW Engineering Discovery Days!

Products and Reactants in Chemical Reactions

The Element Project is due today.  We’ll take the first 5 minutes of class to post them in the hall and review each other’s work

Then we’ll start by wrapping up Monday’s lesson on how to read chemical reactions and will complete pages 5 & 6 of the Chemistry lab packet (6.1).  Again, as always, if students miss class, make sure to view the lesson and complete 6.1 independently so the next labs make sense to you.

Then, we’ll talk about how to control the amount of products in a chemical reaction by completing a reaction challenge, and then debriefing on how to read and interpret the chemical formula for that reaction.  All labs are here, and students should complete (whether present or absent) page 7 and 8 in the lab packet).

Key Concepts

  • Changing the amount of reactants affects the amount of products produced in a chemical reaction.
  • In a chemical reaction, only the atoms present in the reactants can end up in the products.
  • Mass is conserved in a chemical reaction.

If done early, we’ll watch this video on the periodic table.

Friday I’ll be gone, but I’ve got a fascinating film on the atom bond for students to watch- I hope you like it!  Have a wonderful break.

 

 

Chemical Reactions

Finally!  The chemistry we’ve all been waiting for: chemical reactions.  This page shows some of the stuff we’ll be doing the last few weeks of 8th grade.

But first:

-I’ll give back the tests.  There are a few students who will need to take a retake (score of 16 or lower) in order for the next unit to make any sense.  That retake will be Friday.

-Reminder: Element Project is due on Wednesday!

Today we’ll play around with ‘atoms’ and work on modeling what a chemical reaction looks like from an atom’s point of view.  Wednesday we’ll be in the lab finally.  Key concepts from today’s class:

Key Concepts:

  • A physical change, such as a state change or dissolving, does not create a new substance, but a chemical change does.
  • In a chemical reaction, the atoms and molecules that interact with each other are called reactants.
  • In a chemical reaction, the atoms and molecules produced by the reaction are called products.
  • In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed.
  • In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Chemistry Test

Today we’ll start with a chemistry test to set up our final unit on chemical reactions.  Please do your very best work, as this is foundational to understanding (and doing) chemical reactions labs.

After you are done with the test, please spend the remainder of the time either:

  • Cleaning out binder of any past chemistry work (move to cubby).
  • Working on your element baby book/ superhero project (Due Wednesday of next week, but this is the last in-class work time that is available- HOMEWORK if not done today).
  • If done with the element project, could you please help me find an excellent set of sub plans for next Friday (relating to chemical reactions). Email me your suggestions for webquests/ online games/ films to watch that can be fun, engaging and interesting work for 8th graders to learn about chemistry/ chemical reactions.

Thank you!

Chemistry Test

Monday, March 27th: We’ll have another study session to prepare for Wednesday’s Periodic Table and atomic bonding test.  If anyone would like further help, please come in during lunch to meet with me.

Remember, all labs and supporting details are here for you to review, along with the study guide given out in class.

We’ll start our final chemistry unit shortly: Chemical Reactions.

Looking Ahead:

Wednesday, March 29th: Atomic Bonding Test

Wednesday, April 5th: Element Project Due

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