1. 1. CO2 (s)  CO2 (g) 2. CH4 + 2O2  CO2 + 2H2O Warm Up p 46
Copy the following chemical equations into your notebook
CO2 (s)  CO2 (g)
CH4 + 2O2  CO2 + 2H2O
Compare and contrast: read 3x….annotate with thoughts
1st read: The left side of equation 1 with the right side of equation 1
2nd read: The left side of equation 2 with the right side of equation 2
3rd read: Compare and contrast equation 1 and 2
Date
Session #
Activity
Page #
11/6-7 18
Warm Up 46
Chemical Change Lab (formal grade) 47
Chemical Properties and Change Notes 48
Homework:
Read: 41D-45D ?’s. 1-6 on 45D
69D-72D ?’s 1,2,4 on 76D

2. 8.P.1 Understand the physical properties of matter and changes that occur when matter interacts in an open or closed container 8.P.1.3 Compare physical changes such as size, shape and change of state to chemical changes that are a result of a chemical reaction to include changes in temperature, color, gas or formation of a precipitate.

3. Warm Up 1. CO2 (s)  CO2 (g) CH4 + 2O2  CO2 + 2H2O
Same molecule on each side of the equation
Same elements on each side of the equation
One side has solid CO2, the other side has gaseous CO2
This is a physical change….no bonds broken, no new material formed
CH4 + 2O2  CO2 + 2H2O
Different compounds on each side of the equation
There have been chemical bonds broken, atoms rearranged, & new bonds and materials created

4. Objective
TLW explain chemical changes by observing several experimental trials, identifying chemical change evidence, then complete an exit ticket.

5. Leader: runs directions, on task Materials: collects materials
Lab Social Skill Card
Social skill: on task
Group Roles
Leader: runs directions, on task
Materials: collects materials
Clean Up: monitors station & sink area
Data: data table is properly completed by all group members
You should rotate roles after each investigation.
Part of lab grade will be the detail of your observations.

6. Leader: runs directions, on task Materials: collects materials
Lab Social Skill Card
Social skill: on task
Group Roles
Leader: runs directions, on task
Materials: collects materials
Clean Up: monitors station & sink area
Data: data table is properly completed by all group members
You should rotate roles after each investigation.
Part of lab grade will be the detail of your observations.

7. quality observations teamwork
describe how to make quality observations describe teamwork

8. Investigation 1
Send your materials member to the front with a Ziploc bag for the citric acid.
Using the plastic spoon, place about ½ teaspoon of baking soda into the plastic bag that also contains the citric acid.
Using your graduated cylinder, measure 10 mL of water.
Add 10 mL of water to the plastic bag containing the citric acid and baking soda. Close the bag & mix the contents.
Observe and record all the changes that occur.
Send your clean up member to the front with the baggie and its contents.

9. Lab Sheet

10. Investigation 2
Send your materials member to the front for the hydrogen peroxide beaker.
Pour the H2O2 (hydrogen peroxide) into an empty baggie.
Raise your hand to signal you are ready for the next reactant.
Wait for an assistant to add a scoop of yeast to the baggie containing the H2O2 (hydrogen peroxide). Quickly seal the baggie.
Observe and record all the changes that occur
Send your cleanup member to the front with
the empty beaker
the used baggie and its contents.

11. Investigation 3
Using your plastic spoon, measure approximately ½ teaspoon of baking soda.
Place the baking soda into an empty baggie.
Use the graduated cylinder to measure 10mL of vinegar.
Add 10 mL of vinegar to the baking soda in the baggie and quickly seal.
Observe and record all the changes that occur
Send your clean up member to your designated sink to empty and rinse GRADUATED CYLINDER.
Send your clean up member to the front to throw the baggie away.

12. Investigation 4
Send your materials member to the front to obtain your cabbage juice and Mystery Tubes.
Use the pipette to add about 20 drops of cabbage juice to Mystery Tube A.
Observe and record all changes that occur in Mystery Tube A. Place the test tube in the beaker so it doesn’t spill.
Use the pipette to add about 20 drops of cabbage juice into Mystery Tube B.
Observe and record all changes that occur in Mystery Tube B. Place the test tube in the beaker so it doesn’t spill.
DO NOT CLEAN UP YOUR TEST TUBES, YOU NEED THEM FOR THE NEXT INVESTIGATION!!
Send your materials member to the front to return the cabbage juice.

13. Investigation 5
You will be using both your Mystery Tubes A & B from Investigation 4
Holding the tubes over the LARGE beaker in your bin (to prevent spills), pour the contents of one tube into the other tube.
Observe and record all changes that occur
Send your clean up person to your assigned sink to empty and clean the test tubes.
When you table and materials are clean, send your clean up member to the goggle cabinet to return your goggles.

14. CLEAN UP While your clean up member is making sure:
dirty paper towels and the pipette need to be thrown away
glassware, etc is clean
goggles in the sanitizer
restocking your bin, it should look like this:
The rest of you need to make sure your data is complete and you are ready to move on.

15. P
Notes Chemical change: a change that occurs that causes the chemical makeup (composition) of a substance to change. Chemical bonds are broken and new ones created
Evidence
Precipitate
Color change
Temperature change (Exothermic & Endothermic)
Gas produced
Other (Light produced, odor)
A chemical change is also called a chemical reaction

16. Highlight evidence in each investigation
Highlight the evidence you recorded on your lab sheet that a chemical change occurred.

17. Notes (there’s more..)
Some chemical changes release energy…heat, light, etc. They get warmer. These are EXOTHERMIC
Some chemical changes absorb energy…they get colder. These are ENDOTHERMIC
Go back to your lab results. Note if the reaction was endothermic or exothermic. Not all reactions are endothermic or exothermic.

18. Chemical Property P
Properties that change the chemical nature of matter….chemical properties can only be observed or measured in a chemical reaction

19. Chemical Properties pH Reactivity Combustion/flammability Corrosion
Rusting (Iron)
Tarnishing (Silver, Copper, etc)

20. pH
A measurement of how acidic (1-6) or basic (8-14) a material is

22. Reactivity
How easily a substance undergoes a chemical change, or bonds, with other substances

23. Combustion/flammability
Rapid reaction with oxygen, produces heat & light Reactant + Oxygen ----> Oxide(s) + heat + light

24. Corrosion
The gradual destruction (or deterioration) of a material as it reacts chemically with its environment. Corrosion is the primary means by which metals deteriorate.

25. Rusting
A type of corrosion. Iron forms Iron oxide (rust) when iron reacts with oxygen and water. This process gradually destroys the entire sample of iron.

26. Tarnish another type of corrosion
A thin layer of corrosion that forms over some metals. It only affects the outermost layer of the material. Unlike rust, the layer of tarnish seals and protects the underlying layers from reacting.
Copper tarnish
Silver tarnish

27. In your CLEAN tray…. Plastic spoon 3 baggies Graduated cylinder
pipette
Blank lab skill card
Lab Directions
Group role helper slips
Paper towels
Goggles into cabinet
3 baggies
Large beaker
2 test tubes
Water bottle
Vinegar bottle
Baking soda jar