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Happy FRIDAY !  11/30/ 2012 DO NOW!. Are most elements on the periodic table metals, nonmetals, or metalloids? Why are metals commonly used for cookware? Plastic is an insulator. Explain what this means. What does ductile mean?.

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Happy friday 11 30 2012 do now
HappyFRIDAY!  11/30/2012DO NOW!

  • Are most elements on the periodic table metals, nonmetals, or metalloids?

  • Why are metals commonly used for cookware?

  • Plastic is an insulator. Explain what this means.

  • What does ductile mean?


Create a small t chart under your do now and write down your observations
Create a SMALL T-chart under your Do Now and write down your observations


Leq 5
LEQ #5

  • What is the difference between a physical and chemical change?

  • Create another T-chart underneath. (Take up the whole page)

  • Tearing paper and Burning paper?


Physical change notes
Physical Change (NOTES)

  • A change that does NOT change the identity of the substance

  • ex:

    • Tearing paper

    • Melting ice, Boiling water and Freezing water (change in state or phase)


Chemical change notes
Chemical Change (NOTES)

  • Change in appearance AND chemical make-up -- a NEW substance is formed.

  • Irreversible

  • A chemical reaction occurs.

  • Ex:

    • Burning paper

    • Digesting Food


Chemical change notes1
Chemical Change (NOTES)

Signs of a Chemical Change :

  • Color change

  • Light and Heat is produced

  • A gas forms (bubbles)

  • Precipitate forms

    • A solid forms from a chemical reaction that takes place in a solution


Brainpop video
Brainpop Video

  • Write down at least TWO examples of:

  • Physical change

  • Chemical Change

    In your T-Chart


Hypothesis
Hypothesis

  • I think that the difference between a physical change and a chemical change is….

  • Think - Pair - Share


Hot question
Hot Question!

Which is an example of a physical change?

  • Boiling

  • Burning

  • Rotting

  • Rusting


Experiment
Experiment

  • Tell if each example is a chemical change or a physical change.

  • Be ready to explain why…Ms.Kwill randomly pick a team member to explain for the point.

  • Add the correct answer to your T-chart in your notebook.














Lab time
LAB TIME!

  • Perform each station of the lab (I will lead you in the first station).

  • Lab:

    • Follow the procedure carefully!!!

    • Make observations of the change that is occurring

    • Is this an example of a physical change or a chemical change?

    • Explain how you know.


Data collection
Data Collection

  • Discuss your answers with another group…

  • Did you both get the same conclusions?

  • Why or why not?

  • Debate (respectfully)… who was right? Why?


Data analysis notes how can you tell the difference between a chemical and physical change
Data Analysis (NOTES)How can you tell the difference between a chemical and physical change?

  • Signs of a Chemical Change

    • Light and heat is produced

    • A gas forms

    • Color change

    • Precipitate forms

      • A solid forms from a chemical reaction that takes place in a solution


Add examples to your t chart
Add Examples to your T-Chart

  • Salt water boiling

  • Vinegar and baking soda combining

    What about a Mixture? Compound?

    Add to your T-chart


Your turn
Your turn!

  • Read one through 10 and decide if it is a physical change (P) or Chemical Change (C)

  • The next blank you must explain why? What sign did you see of a chemical change

  • You have 7 minutes!


Answer leq on back of exit ticket
Answer LEQ on back of EXIT TICKET

  • Day 1: (Hint: there are 4 signs…)

  • Ms. K mixes 2 substances and passes around the flask for students to observe. She tells them a chemical reaction (change) has taken place. How do the students know?


Day 2 leq 9 chemical reactions
Day 2 LEQ 9 Chemical Reactions

  • Homework: Chemistry questions due TODAY

  • # 23 should be C (Boron is the only metalloid)

  • Do Now: add these words

    Physical Change – draw a picture

    Chemical change – draw a picture

    Participate – draw a picture

  • Chemical reaction

  • Reactant

  • Product

  • Coefficient

  • Subscript


Hot qs
HOT Qs

  • 3. In the making an omelet, which process involves a chemical change?

    • melting butter

    • frying eggs

    • chopping onions

    • stirring eggs

1. Which is only a physical change?

souring or milk

melting of ice

burning of oil

rusting of iron

2.Which process involves a chemical change?

Photosynthesis freezing water boiling water

melting ice


Chemical reactions
Chemical Reactions

  • Watch the video and watch for REACTIONS

    • Are they chemical or physical changes do you think?

  • http://www.youtube.com/watch?v=90FR8m-zEH4


So what is a reaction give me some examples from the video and life
So… What is a Reaction?Give me some examples from the video and life…

  • a response to something


Notes
NOTES

  • Chemical reaction-when two or more substances interact and a chemical change occurs

    • Ex. Rust, when Iron (Fe) combines with Oxygen (O) in the air

    • NOT an ex. When water (H2O) evaporates (still H2O)

  • Reactant + Reactant  Product

    • Example: Carbon + Oxygen  Carbon Dioxide


Reaction in a bag
Reaction in a Bag!

  • Turn in your notebooks to “Signs of a Chemical Change” from yesterday. Be on the lookout to see which of these signs occur in our experiment.

  • Combine: steel wool, Yeast and hydrogen peroxide

  • What happened? How did you know?


  • Pour the baking soda into the Ziploc

  • Put the steel wool into the Ziploc

  • Pour your hydrogen peroxide (or is it vinegar?) into the bag, then QUICKLY zip it up!

  • Shake it like a Polaroid picture.

  • Fill out the chart in your notebook and answer the question with your group.


Hot question1
Hot Question!

What type of change has occurred when a statue changes from it’s original color due to acid rain?

  • The statue has been painted

  • Physical change

  • Physical weathering

  • Chemical change


Testable question
Testable Question

  • How can we represent chemical reactions?

  • Brainpop video


Notes1
NOTES

  • Chemical Equations: how scientists represent chemical reactions

    6 CO2 + 6 H2O  C6H12O6 + 6 O2


Notes2
NOTES

6 CO2 + 6 H2O  C6H12O6 + 6 O2

Reactants Products

Chemical Reaction

Coefficient Subscript


Notes3
NOTES

  • Reactants: substances that take part in a chemical reaction

  • Chemical Reaction: process by which new substance is formed

  • Products: substances made during a chemical reaction


Notes4
NOTES

  • Coefficient: # of molecules of a compound in a chemical reaction

  • Subscript: # of atoms of an element in a compound


Experiment1
Experiment

2 H202 2 H20 + O2

2 (H202)  2 (H20) + O2

  • Reactants?

  • Products?

  • How many molecules of H20 are in the products?

  • How many atoms of Hydrogen are in H202?

  • How many atoms of Hydrogen are in the Reactants?


Experiment notes
Experiment (Notes)

C3H8 + 5 O2 4 H2O + 3 CO2

C3H8 + 5 (O2 )  4 (H2O) + 3 (CO2 )

  • Reactants?

  • Products?

  • How many molecules of H20 are in the products?

  • How many atoms of Hydrogen are in C3H8?

  • How many atoms of Hydrogen are in the Reactants?


Experiment2
Experiment

4Al + 3 O2 2 Al2O3

4(A)l + 3 (O2 )  2 (Al2O3 )

  • Reactants?

  • Products?

  • How many molecules of Al203 are in the products?

  • How many atoms of Oxygen are in O2?

  • How many atoms of Oxygen are in the Reactants?


Experiment3
Experiment

6 CO2 + 6 H2O  C6H12O6 + 6 O2

  • Reactants?

  • Products?

  • How many molecules of C02 are in the reactants?

  • How many atoms of Hydrogen are in H20?

  • How many atoms of Hydrogen are in the Reactants?


What in the world is a precipitate
What in the world is a precipitate?

  • http://www.youtube.com/watch?v=8RmVwz2fNGc (shorter)

  • OR

  • http://www.youtube.com/watch?v=JAeOP2MfrDY&feature=related (longer)


Finding the main idea and supporting details 20 min 4 min paragraph
Finding the main idea and supporting details! (20 min. 4 min/paragraph)

  • Read the article about reaction rates.

  • For each paragraph, write down the main idea and 2 supporting details

  • 1 reader and 1 recorder

  • Reader reads aloud

  • Recorder writes down the main idea and supporting details

  • Switch for each paragraph



Factors that affect the rate of chemical change notes
Factors that affect the RATE of chemical change (NOTES)

  • Temperature

  • Surface area

  • Concentration


Hot q
HOT Q

Which factors will increase solubility of a solute dissolving in a solvent?

  • Decrease temperature and surface area

  • Decrease temperature and increase surface area

  • Increase temperature and surface area

  • Increase temperature and decrease surface area


Ms. Honeycutt will place an alka seltzer in a film canister with:

  • Water

  • Hot water

    3. Tablets

    4. Crushed Tablet

    Students will time how long it took for the reaction to take place


Data collection1
Data Collection with:

  • Record data in the table below:


Reaction rates race
Reaction Rates Race! with:

  • Answer the conclusion questions about reaction rates.

  • It gets harder as you answer more questions

  • If you get stuck, use your article as your solution station (it has all the answers!)


Answer the leq
Answer the LEQ with:

  • Day 2: How could Ms. Honeycutt have increased the rate of the reaction?


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