Unit 7: Stoichiometry WCHS Chemistry.

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Presentation transcript:

Unit 7: Stoichiometry WCHS Chemistry

UNIT 7: WHAT IS STOICHIOMETRY BRING PERIODIC TABLE & CALCULATOR EVERYDAY! “Stoichiometry” is derived from the Greek words stoicheion, meaning “element”, and metron, meaning “measure” TIPS → Attendance, attendance, attendance!!! LEAVE NO WORKSHEETS UNDONE!!!! There will be LOTS of Mini-Quizzes - especially after labs!! If you MUST be absent: www.Misslevakis.weebly.com

LET’S REFRESH SOME GOOD TECHNIQUE Let’s talk about rounding: 2 SIGNIFICANT FIGURES AFTER THE DECIMAL! EXAMPLES: 13.25 1.20 10.00 0.25 0.045 0.0000076

LAB TIPS Copy ALL NUMBERS off the balance (even ZEROS)!!! Think sig figs Make sure to label everything with units and names!!! If you are confused ASK QUESTIONS!! Make sure you UNDERSTAND the lab - quiz TUESDAY!

REFRESHER If I wanted to know the mass of the liquid in the flask, what would I do? Mass of everything - Mass of container MASS OF LIQUID!

LAB: DEHYDRATION OF COPPER SULFATE Find the formula weight of: CuSO4 H2O Cu: 1(64) = 64 S: 1(32) = 32 O: 4(16) = + 64 160 = 160 = 18

LAB: DEHYDRATION OF COPPER SULFATE Find the formula weight of: CuSO4 H2O = 160 = 18 H2O Hydrate = WITH water Dehydrate = “anhydrous” WITHOUT water H2O H2O H2O H2O CuSO4 CuSO4 H2O H2O H2O H2O H2O

26.05 g - 25.28 g = 0.77 g CuSO4 Moles = Mass . = 0.77 g /160 VERY IMPORTANT FORMULA!!!! 26.05 g - 25.28 g = 0.77 g CuSO4 Moles = Mass . = 0.77 g /160 = 0.0048 moles of CuSO4 Formula Weight

1.20 g - 0.77 g = 0.43 g H2O Hydrate Dehydrate Moles = Mass . = 0.43 g / 18 = 0.024 moles of H2O Formula Weight 0.0048 moles of CuSO4 : 0.024 moles of H2O 0.0048 0.0048 1:5 CuSO4 H2O