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Investigation 1

Investigation 1. Substances. Friday, Sept. 6 th. LT 1: Differentiate between qualitative and quantitative characteristics. Agenda District Diagnostic Assessment. BEGIN Chemical Interactions!! Thinking exercise Discuss group roles and responsibilities and lab safety.

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Investigation 1

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  1. Investigation 1 Substances

  2. Friday, Sept. 6th LT 1: Differentiate between qualitative and quantitative characteristics. Agenda • District Diagnostic Assessment. • BEGIN Chemical Interactions!! • Thinking exercise • Discuss group roles and responsibilities and lab safety. • Discuss qualitative and quantitative observations. • Mystery Mixture Observations (powders only).

  3. Substances For the next several weeks we will be investigating the properties and composition of a few of the millions of the different substances in the world. The study of substances and their interactions is chemistry.

  4. Thinking Exercise On p 34, complete the statement: NB #1: A chemical reaction is…..

  5. Lab Safety • You must wear protective eye wear at all times when handling chemicals. • Never taste or directly smell any chemical. • Use caution when moving chemicals. Report any spills to teacher immediately. • Use proper disposal techniques when you have finished using chemicals.

  6. Group Roles and Responsibilities • Your color represents your group role. • Roles are outlined in Appendix C at the back of your notebook.

  7. Types of Observations P 34 Qualitative Observations: Uses the five senses to describe a substance. • E.g.: The ball was round, shiny, blue and makes a “boing” sound when bounced. Quantitative Observation: Uses a measurement of some sort to describe a substance. • E.g.: The ball had a diameter of 12 cm and a mass of 125g.

  8. Observe the Mystery Mixture (MM) • Each group will get one cup containing a 5-mL scoop of MM. • Put on goggles and make your observations on page 35 of your notebook. ONLY COMPLETE PART 1 at this time.

  9. Friday, 9/7/12 LT 1: Differentiate between qualitative and quantitative characteristics. Agenda: • Go over homework. • Complete section 2 for our Mystery Mixture Observations.

  10. Share Observations • What types of observations did you make? • Are your observations detailed and of high quality?

  11. Add Water • Look at directions for Part 2. • Follow procedure and record your observations on page 35.

  12. Sharing Out • What happened when you added one pipette of water to the mixture? • What happened when you added a second pipette? • Did it fizz and bubble every time you added another pipette? • What causes the bubbling and fizzing? • Why does the mixture stop fizzing after so many pipettes?

  13. Monday, Sept. 10th LT 1: Differentiate between qualitative and quantitative characteristics. Agenda: • Turn in Mystery Mixture Observations for grading. • Make observations of individual 9 substances and complete p 37. • Write a prediction of what you think the mystery mixture substances might be. Homework: Revise your Investigation 2 Pre-Assessment

  14. White Substances A substance is a form of matter different from all other forms of matter. Each substance is different from every other substance. This is a set of nine vials containing white substances. Each vial has a different pure substance…no mixtures. Two of these substances are in mystery mixture.

  15. Our Challenge p 37 Inv. 1 Focus Question: What substances make up the mystery mixture?

  16. The Substances We will begin our quest by getting familiar with our substances. Substance can be identified in three ways: chemical name, common name, chemical formula.

  17. Identifying Substances Chemical Name: This is the official, scientific name of the substance. e.g. Sodium Chloride Common Name: The name used in common settings. e.g. Salt Chemical Formula: A specific code for the types and number of elements that make up the substance. e.g. NaCl

  18. Completing Page 37 • Use the CI resource books p 97 – 101 to complete the data table on page 37. • DO NOT OPEN THE VIALS.

  19. Making Predictions • Do you have an idea about which two substances are in the MM? • What could you do to get more information? • How could water help you answer the question about the MM? I predict the mystery mixture will be made of _________________ and _________________ because …

  20. Tuesday, Sept. 11th LT 2: I can identify properties of physical changes and chemical changes. Agenda: • Turn in homework. • Test our MM predictions. • Share out • Make notebook entries. Homework: none

  21. Testing Substances Today we are going to test your predicted substances. You are each going to have an opportunity to mix substances and add water. Let’s go over the lab sheet on page 39. Silently read the procedure to yourself.

  22. Sharing Out • Which two substances do you think make up the MM? • What evidence do you have to support your conclusion? • Which combinations of two substances resulted in fizzing?

  23. Wednesday, Sept 12th LT 2: I can identify properties of physical changes and chemical changes. Agenda: • Discuss what makes “good” evidence. • Re-test those combinations that produced bubbles Homework: Mini Assessment

  24. Reaction • When you added water to the MM, bubbles were produced. What are bubbles? • Was the gas always there? • Where did the gas come from?

  25. Reaction The gas formed as a result of a chemical reaction. Chemical Reaction: During a reaction, starting substances change into new substances. Change is evidence of a reaction.

  26. Reaction • Do you think the two substances in the MM reacted when the water was added? • What is your evidence? • The gas is one change that indicates a reaction. What other changes may indicate a reaction?

  27. Confirmation Reactions We have a list of suspects. Today, you will test JUST THESE 7 again to see if you can narrow your choices further. NOTICE THAT EACH PAIR OF SUBSTANCES IS ASSIGNED ITS OWN WELL. MAKE SURE YOU USE THE ASSIGNED WELL.

  28. Conclusions • Why did we only test these 7? • What was our focus question? • Do you have a conclusion?

  29. Evaporates • Where is the gas that formed as a result of the reactions? • What is left in the well trays? Are they all the same? • How could we find out what is in the liquid left in the well trays?

  30. Thursday, Sept 13th LT 2: I can identify properties of physical changes and chemical changes. Agenda: • Go over homework • Make observations of the evaporates • Multimedia Confirmations • Putting it All Together Worksheet QUIZ TOMORROW OVER VOCAB

  31. Evaporation Results • Compare the evaporates. • Decide which combination you feel is the MM and record it on p 41.

  32. Multi media confirmations

  33. Friday, Sept 14th LT 2: I can identify properties of physical changes and chemical changes. Agenda: • Take Quiz • Putting it All Together Worksheet No Homework.

  34. Conclusions

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