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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. 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

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

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

  6. 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: • What evidence did you have that there was hydrogen and oxygen in the test tubes? • Agenda: • Do Now • Chem Talk • Summary

  7. 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

  8. 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

  9. 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.

  10. 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

  11. 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

  12. 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

  13. 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=?

  14. 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)

  15. 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

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

  17. Summary • Read Chem Talk, pg. 104-107 • Answer Checking Up questions on pg. 107 • Essential Questions-pg. 108 • What does it mean? • How do you know? • Why should you care? • LO and SC reflection

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

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