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Alchemy Unit

Alchemy Unit. Investigation II Lesson 1 A New Language. ChemCatalyst. There are two bottles on a shelf in a chemistry lab. Both contain a shiny metal substance that resembles gold. Bottle A is labeled Au (s) . Bottle B is labeled FeS 2 (s) .

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Alchemy Unit

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  1. Alchemy Unit Investigation II Lesson 1 A New Language

  2. ChemCatalyst • There are two bottles on a shelf in a chemistry lab. Both contain a shiny metal substance that resembles gold. Bottle A is labeled Au (s). Bottle B is labeled FeS2(s). • Do you think both bottles contain gold? Why/why not? • What elements are Au, Fe and S?

  3. Discussion Questions • What does the number 2 in the formula FeS2 mean? • Why are some letters capitalized and some not capitalized? • Can you define the word element? • How are elements different from compounds?

  4. “A New Language” Instructions • What do the chemical symbols tell us about the substance inside the vial? • You will make careful observations of the substances in the 17 vials. • Then, you will identify an unknown substance in vial 18. • DO NOT OPEN THE VIALS!!!!

  5. “Making Sense” Discussion • Chemical formulas tell us which elements a substance contains. • What symbols are used to label something called a: • Sulfate • Nitrate • Hydroxide • What symbols represent copper sulfate?

  6. Making Sense Discussion • Is copper sulfate an element or a compound? • What elements are in copper sulfate • What do the subscript numbers mean? CuSO4

  7. Definitions • A chemical formula is the set of symbols a chemist uses to represent a compound. • A compound is a substance that consists of two or more elements chemically combined

  8. What About Letters in ( )? • What do (g), (l) and (s) mean? • What is: • H2O (l) • H2O (g) • H2O (s)

  9. What About (aq)? • What do all the flasks with (aq) on them have in common? • Aq stands for aqueous a substance is dissolved in water • How are NaOH (s) and NaOH (aq) the same? How are they different? • How are NaOH (aq) and H2O (l) the same? How are they different?

  10. More About Aqueous Solutions • Solute: substance dissolved in the water • Solvent: the water • So a substance is aqueous if it is dissolved in water

  11. Check In • Imagine that you find a flask that is labeled Na2SO4(aq) • What does the label tell you about what is in the flask?

  12. You’re Ready for a Quiz Tomorrow!

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