1. CATALYST (10 minutes, individual work): 1. Counting atoms
Assignment 4 Chemical Detectives at the Molecular Level LO: To explain the differences between chemical and physical changes through observable evidence. EQ: What evidence can be used to tell the difference between chemical and physical changes.
LEVEL ZERO VOICE
CATALYST (10 minutes, individual work):
1. Counting atoms
2. Define:
endothermic
exothermic
physical change
chemical change
AGENDA
Discuss lab
Lab
Reading
exhibition
HOMEWORK
1. Finish processing tasks

2. Class discussion: How do you know when a chemical reaction has taken place?

3. Guiding Question: How can I explain the differences between a chemical change and a physical change through observable evidence?
You will be observing several ways in which matter interacts. Your task is to collect evidence to prove whether the interaction demonstrates a physical change or a chemical change.

4. Now you will be testing the following compounds
Sugar C12H22O11
Wax C31H64

5. Sugar Cubes
Rows (1-3)
Write observations

6. Row 1: Crush sugar https://www.youtube.com/watch?v=QCfEVnaIguM

7. Row 2: sugar in water https://www.youtube.com/watch?v=qc1z84MDKxE

8. Row 3: burning sugar https://www.youtube.com/watch?v=8gVyaAXKjd4

9. Row 4: melt wax https://www.youtube.com/watch?v=lK-vMXg0gJs

10. Row 5: burn candle wick https://www. youtube. com/watch

11. Now you will be testing the following compounds
Vinegar (acetic acid) C2H4O2
Citric acid C6H8O7
Baking soda (sodium bicarbonate) NaHCO3
Cornstarch C6H12O5
Iodine solution I2
Washing soda (sodium carbonate) Na2CO3

12. Lab safety:
These are all household chemicals that you don’t need gloves to handle but you do need goggles because they can’t get in your eyes.
Do not get on your skin.
Do not ingest.
Proper smelling technique

13. Originally, you were going to design the experiment yourself and determine the amount of each you would test…. We don’t have time so… (class discussion)
Vinegar (acetic acid) C2H4O2
Citric acid C6H8O7
Baking soda (sodium bicarbonate) NaHCO3
Cornstarch C6H12O5
Iodine solution I2
Washing soda (sodium carbonate) Na2CO3

14. Lab safety:
These are all household chemicals that you don’t need gloves to handle but you do need goggles because they can’t get in your eyes.
Do not get on your skin.
Do not ingest.
Proper smelling technique

15. Reaction observations for iodine:
Iodine/citric acid: clump together, no reaction
Iodine/baking soda: no reaction
Iodine/cornstarch: changes color, turns black

16. We will use the following mixture to highlight what happens at the molecular level: citric acid and washing soda.

17. C6H8O7 + Na2CO3 → CO2 + H2O + Na3C6H5O7
The mixture between citric acid (C6H8O7) and washing soda (Na2CO3) showed evidence of a chemical reaction.  Scientists write chemical reactions as equations to show what happened before and after.  It makes carbon dioxide, water, and trisodium citrate.
Write the chemical equation and label each item with its name (found above):
C6H8O7    +  Na2CO3   →   CO2    +  H2O  + Na3C6H5O7

18. C6H8O7       +    Na2CO3       →   CO2        +     H2O      +    Na3C6H5O7
Reactants
Products

19. Before chemical reaction

20. After chemical reaction

21. Cl.Ev.Re.:
Prove how you know the citric acid and washing soda mixture produced a chemical change with evidence and reasoning.  Make sure you include the what happens at the molecular level.  You may include labeled diagrams, but you need to explain your ideas in words as well.  
Claim: Write your claim. (chem rxn?)
Evidence: What is your evidence to support your claim? State evidence without reasoning. List lines of evidence.
Reasoning: Explain why your evidence supports your claim.

22. Desalination Project (phase changes)
Final Project
Temperature in Reactions (includes Conservation of Mass)
Chemical vs Physical Changes (includes Conservation of Mass)
Structure of the atom, Isotopes, Valence Electrons

23. PROCESSING TASK (10 minutes, individual work):
Assignment #3 Chemical Detectives at the Molecular Level LO: To be able to draw a molecule given its molecular formula. EQ: Compare and contrast atoms and molecules?
LEVEL ZERO VOICE
PROCESSING TASK (10 minutes, individual work):
Model the chemical reaction for the electrolysis of water.
Underneath the diagram, explain in words how you can tell if a chemical reaction has taken place.
AGENDA
Writing reactions
Modeling reactions
HOMEWORK
1. Finish processing tasks