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Unit 3: Cool Chemistry Show

Unit 3: Cool Chemistry Show. Essential Questions. How do you determine whether a chemical or physical change has occurred? What characteristics are used to identify a chemical reaction taking place? How are symbols used to write chemical formulas of compounds?

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Unit 3: Cool Chemistry Show

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  1. Unit 3: Cool Chemistry Show

  2. Essential Questions • How do you determine whether a chemical or physical change has occurred? • What characteristics are used to identify a chemical reaction taking place? • How are symbols used to write chemical formulas of compounds? • How are chemical equations written? • What are endothermic and exothermic reactions? • How can the rate of a reaction be altered? • What are properties of acids and bases? • What are oxidation and reduction reactions?

  3. Chapter Challenge • Present an entertaining and informative science show to other students • Content will include physical/chemical changes or acids/bases • Presentation must include a demonstration and an audience-appropriate explanation of the concepts • Written summary + directions for the show and explanations of the chemistry • You may work in groups, topics will be assigned

  4. Day 1: Chemical and Physical Change • Learning Objectives • Learn to differentiate between chemical and physical changes • Make observations and cite evidence to identify changes as chemical or physical • Explore the new properties exhibited when new materials are made from combinations of two or more original materials • Design an experiment to test properties of different combinations of materials

  5. Starter • How do you know if a chemical change or physical change has occurred? • Give 3 examples of each. • Time: 15 minutes

  6. Activity 1 • Several stations are set up in the back to observe chemical and physical changes. • Create a data table with three columns for the process you complete, observations and whether it is a chemical or physical change • Time: 60 minutes

  7. Activity 2 • You will do a lab write up for this laboratory following the CERR model • Check wiki for what to include for write up • Time: 10 minutes

  8. Closing & Homework • What is a physical change? Give 2 examples. • What is a solution, solute and solvent? • What is a chemical change? Give 2 examples. • What “clues” can you look for to determine if a chemical change has occurred or not? • What is a saturated solution? • Homework: • Chemistry to Go, pg. 777 #1, 2, 4, 5 • Preparing for the Chapter Challenge

  9. Day 2: More Chemical Changes • Learning Objectives: • Observe several typical examples of evidence that a chemical change is occurring • Make generalizations about the combinations of materials that result in the same evidence • Make generalizations about materials that tend to react with everything and materials that tend not to react with anything • Practice careful laboratory techniques

  10. Starter • Which of the following will result in a chemical reaction and why? • Mix 1 cup flour, 1/3 cup sugar, 1 tsp baking powder with 1 cup milk and 1 egg. Put the mixture in the oven and bake for 30 minutes • Add 2 drops of sodium carbonate to 2 drops of sodium sulfate • Time: 15 minutes • Please hand in homework from last lesson

  11. Activity 1 • Move with your lab groups • Complete the table on page 780 • Read through steps 1-3 on page 779-781 • Time: 10 minutes

  12. Activity 2 • Move to the back lab benches. • All the equipment is on the back bench that you will need • Complete steps 1-3, recording your data along the way • When you are finished, clean up and put the materials back where you got them • Time: 45 minutes

  13. Closing & Homework • Discuss the following questions in your group: • How do you test for oxygen,carbon dioxide and hydrogen? • What is a precipitate? • What are acid-base indicators? • Homework • Chemistry to Go, pg. 784 #1, 2, 3 • Preparing for the Chapter Challenge • Lab report due on Thursday

  14. Day 3: Chemical Names and Formulas • Learning Objectives: • Predict the charges of ions of some elements • Determine the formulas of ionic compounds • Write the conventional names of ionic compounds • Make observations to determine whether there is evidence that chemical changes occur on combining two ionic compounds

  15. Starter • The periodic table provides valuable information for each of the elements. • Look at calcium on your periodic table in your text book. • What information is provided on the periodic table for calcium? • What significance does this information have? • Time: 15 minutes

  16. Activity 1 • Write the formulas for the following elements and how many protons they have: • Copper, zinc, oxygen, silver, nitrogen, magnesium, iron, aluminum, potassium, sulfur, gold, carbon, chlorine, hydrogen, iodine, calcium, sodium, lead • Time: 15 minutes

  17. Activity 2 • A compound is formed when a negative ion (metal) and positive ion (nonmetal)bond • The formula for potassium bromide is KBr • Write the formula for 4 other compounds that are created from a group 1 element combining with a group 7 element • The formula for magnesium oxide is MgO • Write the formula for 4 other compounds that are created from a group 2 element combining with a group 6 element • Time: 15 minutes

  18. Activity 3 • If the values of the charge on a positive and negative ion, the resulting formula for the compound is simply the chemical formulas • If the values are not the same, subscripts are used to balance them • Example: Al2O3 – Al3+, O2- • Write the names and formula for the following compounds: • Calcium and oxygen • Aluminum and fluorine • Boron and oxygen • Calcium and chlorine • Time: 10 minutes

  19. Activity 4 • Some ionic compounds involve polyatomic ions • Sulfate (SO42-, CO32-, NO3-, NH4+, etc.) • Write the formula for the following: • Potassium nitrate • Potassium sulfate • Write the name for the following: • (NH4)2SO4 • LiNO3 • Time: 10 minutes

  20. Activity 5 • Do chemical reactions occur every time reactants are mixed? • Complete the reactions and fill out the table below • Time: 20 minutes

  21. Closing & Homework • How are ionic compounds formed? • What is a polyatomic ion? Give an example of a compound with one. • Distinguish between an ionic and covalent bond. • Homework: • Chemistry to Go, pg. 790 #1, 2, , 3, 6 • Preparing for the Chapter Challenge

  22. Day 4: Chemical Equations

  23. Day 5: Chemical Energy (60 mins)

  24. Day 6: Reaction Rates

  25. Day 7: Acids, Bases & Indicators

  26. Day 8: Colour Reactions

  27. Day 9: Summative Assessment

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