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Chapter 2, Section 1

Chapter 2, Section 1 . Elements and Compounds. Date: HW: 2.1 CTG, pg. 109 #1-4. LO: Explain matter Explain the differences between elements and compounds SC: Decompose water by electrolysis into the two elements from which it is composed Test 2 elements to determine their identities

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Chapter 2, Section 1

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  1. Chapter 2, Section 1 Elements and Compounds

  2. Date:HW: 2.1 CTG, pg. 109 #1-4 • LO: • Explain matter • Explain the differences between elements and compounds • SC: • Decompose water by electrolysis into the two elements from which it is composed • Test 2 elements to determine their identities • Learn one way to determine the chemical formula of a material • Compare characteristic properties of a material to those of its constituent elements • Represent materials with chemical formulas using numbers and the symbols of elements. • Practice safe laboratory techniques with flames and explosions • Do Now: • Read Chapter Challenge on pg 98-99 • Copy LO and SC on new left side page • WDYS/WDYT-Pg. 101 • You must write at least 2 sentences for each and talk about the SCIENCE! • Agenda: • Do Now • Investigate • Summary

  3. Do Now: • Do Now: • Number your notebook pages (1-100 at least) • WDYT-Pg. 101 • You must write at least 2 sentences for each and talk about the SCIENCE!

  4. Set up notebooks, 1-12 • Teacher directed

  5. Do Now • Open up your notebook, check to make sure that you have it set up for notebook check • Grab a book and turn to p. 102 • Turn to a partner and describe what is going to happen!

  6. Investigate • #1 Complete in your notebook, discuss at your table • #2 Complete in your notebook, share at your tables • #3 watch teacher demo of how to set up apparatus • Set up notebooks-teacher led • Assign jobs, complete #4-7 • You must wear safety goggles and aprons at all times! • Do NOT play around, you will lose lab privileges! • Answer #9

  7. Do Now: • On p. 101, read through and answer question 1 • Skim through the investigation HW Due Friday: CTG p.109 #1-4

  8. Do Now • Open up to p. 102 • Complete notebook up until number 9 (10 minutes)

  9. Teacher Demo • #10-12 while running electrolysis

  10. Summary • Explain how zinc and HCl produced Hydrogen?

  11. Read through the chem talk—p. 104-107 • When finished, answer the checking up questions in the margin of the last page.

  12. Chem Talk • What is an element? • Name 5 elements that you know • An element is any material that cannot be broken down into simpler materials by chemical means

  13. Chem Talk • What is Matter? • Anything that is made up of 1 or more elements • EVERYTHING IS MATTER! • Different combinations of elements make different things

  14. Chem Talk • What is Chemistry? • The study of the properties of elements, how the elements combine, the properties of these combinations, and the energy changes that result from these combinations.

  15. Chem Talk • How do we represent elements? • We use Symbols to represent elements • O=Oxygen • H=Hydrogen • Cl=Chlorine • 1st letter is always capitalized • If there is a 2nd letter, it is lower case • Zn=Zinc • Pb=Lead • Symbols can be found on the periodic table

  16. Chem Talk • What is a compound? • When elements combine to form new substances • Compounds have entirely new characteristics • Like combining letters to make words • H2O is a compound • 2 Hydrogens • 1 Oxygen

  17. Chem Talk • What is electrolysis? • Using electricity in an ionic solution to result in a chemical change • You did this in the lab when you decomposed water into Hydrogen and Oxygen in the test tubes • The compound water has very different characteristics from H and O

  18. Chem Talk • How do we represent Compounds? • Use a chemical formula • Combination of element symbols in definite numerical proportions • H2O=2Hydrogens and 1 Oxygen • CCl4=1 Carbon, 4 Chlorines • CO2=?

  19. Chem Talk • Why do we write chemical equations? • To “show” what is happening in a chemical reaction • g=gas, l=liquid, s=solid, aq=aqueous (dissolved in water)

  20. Chem Talk • Remember Conservation of Mass? • Matter cannot be created or destroyed… • What we start with we have to end with! • We need to apply this to chemical equations

  21. Chem Talk • More on Conservation of Mass… • Unbalanced equation… • Try balancing on your own…

  22. Video: Ring of Truth • http://www.youtube.com/watch?v=buFe-CyQctQ

  23. Proficiency Check: • Explain the main differences between an element and compound

  24. Proficiency Check Element or Compound C Ca NaNO3 CO Co

  25. Do Now: • Write out the type and how many elements are in the compound. NaClH2SO4 C12H22O11 Ba(NO3)2

  26. Summary • Go through and prove that you satisfied the Learning Objective Highlight (underline) areas in your notebook and write a paragraph (2 or 3 sentences) talking about those areas

  27. Worksheet Do the worksheet on a separate sheet of paper

  28. Summary Go through and prove that you satisfied the Learning Objective Highlight areas in your notebook and write a paragraph talking about those areas When finished: Essential Questions-pg. 108 • What does it mean? • How do you know? • Why should you care?

  29. Chem To Go (CTG) • Pg. 109, #1-4

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