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Warm up

Warm up. Work individually to finish q uestions on pg 19 in Matter and Energy Textbook Complete questions 1-6. Three Day Weekend Catch Up!. Objective.

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Warm up

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  1. Warm up • Work individually to finish questions on pg 19 in Matter and Energy Textbook • Complete questions 1-6

  2. Three Day Weekend Catch Up!

  3. Objective • Students will be able to identify a chemical verses a physical change occurrence as evidenced by taking notes in class and correct answers on the Change Worksheet

  4. Physical Change Vs Chemical Change 9-2-14

  5. Heads up: Test Thursday • Test Covers part of Scientific Inquiry and what we have covered up to this point in Physical Science • Review Notes • *Know steps to scientific method and difference between different types of variables

  6. Vocabulary Review

  7. What is Physical Science?

  8. The sciences concerned with the study of inanimate natural objects, including physics, chemistry, astronomy, and related subjects

  9. Which state of matter has particles arranged in a regular pattern?

  10. Solid

  11. Which state of matter has particles move about at the highest speed?

  12. Gas

  13. Name an exothermic state change:

  14. Freezing, Condensation

  15. Name an endothermic state change:

  16. Boiling, evaporation, and melting

  17. What is an element?

  18. Elements are pure, meaning they only contain one type of atom

  19. What is a compound?

  20. Compounds are mixed, meaning it is a substance that contains two or more atoms bonded together

  21. Name a homogeneous mixture

  22. Mnm’s

  23. Name a Heterogeneous mixture

  24. Taco

  25. Do compounds or mixtures form new substances?

  26. Compounds

  27. More on Gases • WRITE THIS IN YOUR JOURNALS: • Gas Behavior: • Higher pressure= lower volume (at constant temperature) • Higher temperature= higher pressure (at constant volume) • Temperature: measurement of kinetic energy of a substance • Kinetic Energy: energy of motion Higher temperature= high volume at constant pressure from Mr. Derickson’s notes

  28. Physical Change Verses chemical change • “Chemical change is any change that results in the formation of new chemical substances. At the molecular level, chemical change involves making or breaking of bonds between atoms. These changes are chemical: • iron rusting (iron oxide forms) • gasoline burning (water vapor and carbon dioxide form) • eggs cooking (fluid protein molecules uncoil and crosslink to form a network) • bread rising (yeast converts carbohydrates into carbon dioxide gas) • milk souring (sour-tasting lactic acid is produced) • Sun tanning (vitamin D and melanin is produced)” • http://antoine.frostburg.edu/chem/senese/101/matter/faq/physical-chemical.shtml

  29. Physical change rearranges molecules but doesn't affect their internal structures. Some examples of physical change are: • whipping egg whites (air is forced into the fluid, but no new substance is produced) • magnetizing a compass needle (there is realignment of groups ("domains") of iron atoms, but no real change within the iron atoms themselves). • boiling water (water molecules are forced away from each other when the liquid changes to vapor, but the molecules are still H2O.) • dissolving sugar in water (sugar molecules are dispersed within the water, but the individual sugar molecules are unchanged.) • dicing potatoes (cutting usually separates molecules without changing them.) • http://antoine.frostburg.edu/chem/senese/101/matter/faq/physical-chemical.shtml

  30. Bill Nye: Chemical reactions produce a chemical change • https://www.youtube.com/watch?v=Rtcf6Pjahec • 0:00-3:45

  31. Example of a chemical reaction • Baking soda and vinegar demo • This demonstrates concepts within the Law of Conservation of Matter and Law of Conservation of Energy

  32. Law of conservation of matter • The Law of Conservation of Mass states that matter can be changed from one form into another, mixtures can be separated or made, and pure substances can be decomposed, but the total amount of mass remains constant • http://www.chem.wisc.edu/deptfiles/genchem/sstutorial/Text1/Tx14/tx14.html • WRITE THIS IN YOUR SCIENCE JOURNALS

  33. Law of Conservation of Energy • The law of conservation of energy states that the total amount of energy in a system remains constant ("is conserved"), although energy within the system can be changed from one form to another or transferred from one object to another • http://www.energyeducation.tx.gov/energy/section_1/topics/law_of_conservation/

  34. Evidence of a Chemical Reaction • Formation of a precipitate • Generation of gas • Color Change • Absorption or release of heat • Formation of bubbles • Formation of a solid

  35. Formation of a precipitate • Precipitation Reactions occur when cations and anions of aqueous solutions combine to form an insoluble ionic solid, called a precipitate • http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Reactions_in_Aqueous_Solutions/Precipitation_Reactions • A PRECIPITATE IS CREATED WHEN A SOLID IS FORMED FROM TWO SOLUTIONS

  36. FORMATION OF A PRECIPIATE EXAMPLE • Cooking an egg results in formation of the gel around the yolk into egg white (protein precipitation)  • https://answers.yahoo.com/question/index?qid=20091222201303AAgbKGw

  37. Generation of a gas • Experiment (reaction) that results in gas production

  38. Color change • Experiment (reaction) that changes the original material’s color

  39. Absorption or release of heat • Experiment (reaction) that cools or heats substances

  40. Formation of Bubbles • An experiment (reaction) that produces bubbles • Example: Antacid Tablet

  41. Formation of a solid • Chemicals change to solid state • Example: Snail shells created from calcium carbonate and proteins built from inside out layers harden to form shell

  42. Worksheet • With the remaining time work on the Chemical verses Physical change worksheet • You may work with a partner for this activity if you wish

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