Happy FRIDAY !  11/30/ 2012 DO NOW! - PowerPoint PPT Presentation

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Happy FRIDAY !  11/30/ 2012 DO NOW!

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  1. 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?

  2. Create a SMALL T-chart under your Do Now and write down your observations

  3. 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?

  4. 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)

  5. 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

  6. 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

  7. Brainpop Video • Write down at least TWO examples of: • Physical change • Chemical Change In your T-Chart

  8. Hypothesis • I think that the difference between a physical change and a chemical change is…. • Think - Pair - Share

  9. Hot Question! Which is an example of a physical change? • Boiling • Burning • Rotting • Rusting

  10. 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.

  11. Melting Ice

  12. Chopping Wood

  13. Mixing Salt and Water

  14. Breaking Glass

  15. Burning Wood

  16. Melting Iron

  17. Melting Ice Cream on a hot day

  18. Digesting an apple

  19. Boiling Water

  20. Cooking an egg

  21. Mixing Peas and Carrots

  22. Bicycle rusting

  23. 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.

  24. 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?

  25. 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

  26. Add Examples to your T-Chart • Salt water boiling • Vinegar and baking soda combining What about a Mixture? Compound? Add to your T-chart

  27. 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!

  28. 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?

  29. 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

  30. 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

  31. 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

  32. So… What is a Reaction?Give me some examples from the video and life… • a response to something

  33. 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

  34. 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?

  35. 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.

  36. 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

  37. Testable Question • How can we represent chemical reactions? • Brainpop video

  38. NOTES • Chemical Equations: how scientists represent chemical reactions 6 CO2 + 6 H2O  C6H12O6 + 6 O2

  39. NOTES 6 CO2 + 6 H2O  C6H12O6 + 6 O2 Reactants Products Chemical Reaction Coefficient Subscript

  40. 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

  41. NOTES • Coefficient: # of molecules of a compound in a chemical reaction • Subscript: # of atoms of an element in a compound

  42. 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?

  43. 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?

  44. 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?

  45. 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?

  46. 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)

  47. 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

  48. Factors that affect the RATE of a chemical change (NOTES) • Rate—how quickly something happens

  49. Factors that affect the RATE of chemical change (NOTES) • Temperature • Surface area • Concentration

  50. 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