Do Now & Announcements Take out HW to be checked if you did not get it stamped. Work on Molar Mass/%Comp Warm Up Problems Unit 2 Quiz WED 9/28 (A),

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Presentation transcript:

Do Now & Announcements Take out HW to be checked if you did not get it stamped. Work on Molar Mass/%Comp Warm Up Problems Unit 2 Quiz WED 9/28 (A), THUR 9/29 (B)

41.67% Mg 54.86% O 3.46% H 47.70 % Cr 52.30 % F 15.77% Al 28.11% S 56.12 % O 38.67% K 13.86% N 47.47% O 58.33 grams 108.996 grams 342.14 grams 101.11 grams

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Classification 6 Substances Piece of Aluminum Metal Copper Sulfate Crystals Copper Chloride Solution Ethanol Sulfur Powder Copper Chloride Solution + Mineral Oil

Grams <-> Moles Conversions

Atom vs. Molecule ATOM MOLECULE Atom= the smallest, simplest unit of matter. Can refer to individual elements only Molecule=the smallest, simplest unit of a pure substance Can refer to elements or compounds ATOM H H H H H MOLECULE MOLECULE

ATOM MOLECULE H H H H H MOLECULE A water molecule is represented by H2O A water molecule contains 2 atoms of hydrogen and 1 atom of oxygen A hydrogen molecule is represented by H2 (it’s diatomic) An oxygen molecule is made up of 2 hydrogen atoms

Remember: 1 mole = 6.02 x 1023 particles!

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Molar Conversions Exit Activity Turn in when done HW=right half of note sheet.