Molar Conversions (p.80-85, 221-226) Ch. 3 & 7 – The Mole

Do Now: Share your paragraph explaining the “why” of the flame test lab with a partner!

Consider This: How many atoms do chemists need to have in order to measure a quantity of an atom? Do you believe that the same number is always needed? Explain.

A. What is the Mole? A large amount!!!! A counting number (like a dozen) Avogadro’s number (NA) 1 mol = 6.02  1023 items A large amount!!!! VERY

HOW LARGE IS IT??? 1 mole of hockey pucks would equal the mass of the moon! 1 mole of basketballs would fill a bag the size of the earth! 1 mole of pennies would cover the Earth 1/4 mile deep!

B. Molar Mass Mass of 1 mole of an element or compound. Atomic mass tells the... atomic mass units per atom (amu) grams per mole (g/mol) Round to nearest whole number!

B. Molar Mass Examples carbon aluminum zinc 12 g/mol 27 g/mol 65 g/mol

Molar Mass Chart: Element Symbol # of atoms in cmpd Atomic Mass (rounded) Total

water sodium chloride H2O 2(1) + 16 = 18 g/mol NaCl 23 + 35 = 58 g/mol B. Molar Mass Examples water sodium chloride H2O 2(1) + 16 = 18 g/mol NaCl 23 + 35 = 58 g/mol

sodium bicarbonate sucrose NaHCO3 23 + 1 + 12 + 3(16) = 84 g/mol B. Molar Mass Examples sodium bicarbonate sucrose NaHCO3 23 + 1 + 12 + 3(16) = 84 g/mol C12H22O11 12(12) + 22(1) + 11(16) = 342 g/mol

B. Challenge Molar Mass Examples 3 moles of Ammonia 8 moles of Lithium Sulfate 3 NH3 3(14) +3(3(1)) = 51 g/mol LiSO4 8(7) + 8(32) + 8(4(16)) = 824 g/mol

B. Challenge Molar Mass Examples 6 moles of Calcium Phosphate Exit Card: 2 moles of Calcium Chloride/ Rubidium Nitrate 6 Ca3(PO4) 2

Do Now: What is the molar mass of silver? What is the molar mass of silver nitrate? If I have four moles of silver nitrate, how many grams do I have?

C. Molar Conversion Examples Use this set up for mol to g REMEMBER: 1st—Molar Mass chart; 2nd –multiply by the number of moles! __mol____ ____g ____ = 1 mol ____

C. Molar Conversion Examples Use this set up for g to mol REMEMBER: 1st—Molar Mass chart; 2nd –multiply by the number of moles! __g___ 1 mol ____ = ____g ____

C. Molar Conversion Examples How many moles of carbon are in 26 g of carbon? 26 g C 1 mol C 12.01 g C = 2.2 mol C

C. Molar Conversion Examples How many grams of cobalt nitrate are in 2 moles? REMEMBER: 1st—create the chart; 2nd –multiply by the number of moles! =

Your Turn: Spend the rest of the period working on the handout, you received at the door. I will be monitoring and helping as needed!

Do Now: You measure out 725.11 grams of Copper (II) Phosphate. How many moles did you measure out?

REMINDER: The Fall Final Exam (which counts as two test grades is NEXT Thursday). Take a moment to generate a list of ALL the topics that we have studied over the last semester!

Topic List Sig Figs & Sci. Notation Matter Classification (mix, ele, etc.) Intensive/Extensive Prop. Physical/Chemical Change Atomic Structure (p, n, e) Periodic Table Electrons (behavior, orbitals, configuration) Bonding (I, C, M) Naming (Ionic & Covalent) Writing Formulas Molar Mass Calculation Phase Diagrams Density Periodic Trends Unit Conversion Atom’s History

Want 10 Bonus Points? Create a “Review Packet” Must Contain: Both Molar Mass wkshts from this week A check off sheet, explaining how you studied each topic, SIGNED by a parent/guardian.

For the Special Lab next Friday Bring a fillable Christmas Ornament Some sort of figurine Cool present for a younger sibling/ yourself! Can’t get the stuff? You’ll do another lab.

C. Molar Conversions molar mass 6.02  1023 MOLES (g/mol) IN GRAMS MOLES NUMBER OF PARTICLES (g/mol) (particles/mol)

C. Converting between moles: LITERS OF GAS AT STP Molar Volume (22.4 L/mol) MASS IN GRAMS MOLES NUMBER OF PARTICLES Molar Mass (g/mol) 6.02  1023 particles/mol Molarity (mol/L) LITERS OF SOLUTION

Do Now: How many grams are in 7.28 mol of AlPO4? Show your work!

Very Quickly…. Let’s set up this lab. On your Styrofoam cup, write your name. Sharing scissors, cut your pipe cleaner into fourths (fold in half twice then cut at all folds) Twist into snowflake design Get string from me (find a pencil/pen too!)

Do Now: How many molecules are in 4.00 moles of glucose?

Alumimole Lab Get into groups of three—assign each member a role: recorder, materials manager, and speaker Listen to all directions. You only have 15 minutes to complete the lab!

Alumimole Procedure Determine the molar mass of aluminum: __________g/1mol Acquire exactly 0.1 mol of aluminum foil Create a mole (animal) model Explain how you determined the molar mass of aluminum in a sentence. How many grams would be in 1. 5 mol of Aluminum? In 22 mol of Aluminum? How many atoms were in the amount of Al you got? Show all work!

Check out your Snowflake… Done? Spray with acrylic spray and take home. Note quite—let’s finish your set up. Periods 4-6.

In the time remaining… Work on your molar conversion worksheets. Need help, ask a classmate!

C. Molar Conversion Examples How many molecules are in 2.50 moles of C12H22O11? 6.02  1023 molecules 1 mol 2.50 mol = 1.51  1024 molecules C12H22O11

C. Molar Conversion Examples Find the mass of 2.1  1024 molecules of NaHCO3. 2.1  1024 molecules 1 mol 6.02  1023 molecules 84.01 g 1 mol = 290 g NaHCO3

Molar Mass Conversion Example Find the number of liters of gas at STP in 4 mol of H2 gas 4 mol H2 22.4 L H2 1 mol H2 = 89.6 L H2

More Practice: If there are 9.6x10^15 particles of sugar in a solution then how many moles of sugar are there?

More More Practice When there are 0.0314 moles of candy canes how many candy canes are there?

More More More Practice What volume (L) is 0.00353 moles of He gas at 0ºC and 1.0 atm?

More (IV) Practice If we have 0.072 g of FeCl3 then how many moles are there?

Do Now:

Do Now: Be certain to continue working on your homework! Need help? Come to tutoring… Pull out a pencil, piece of scratch paper, your periodic table, and a calculator that is ONLY a calculator!

SLO Administration: Diagnostic If you don’t know, don’t answer it will alter your data Do the best you can and TAKE your time—you do KNOW some of this! Good Luck! 

Do Now: How many grams are in 7.3 mol of Ti(NO3)2? Solve the following molar mass/ conversion problems: Molar Mass of CaCl2 How many grams are in 7.3 mol of Ti(NO3)2? How many mols are in 123.8 L of H2 gas at STP? How many grams of FeCl3 are in 7.214  1024 molecules?

Last Minute—Student Presentations Pull out your timeline and your pencil Let’s be attentive quickly…So we can play!

The Return of… Two Groups Get Ready to determine the “Molar Massters” of the class! Write your answer on a whiteboard—all must have the correct answer in a group to earn the point! Flip over to show your classmates Ready…set…let’s start!

Let’s Play! 1. Number of atoms in 0.500 mole of Al a) 500 Al atoms b) 6.02 x 1023 Al atoms c) 3.01 x 1023 Al atoms 2.Number of moles of S in 6.02 x 1023 S atoms a) 1.0 mole S atoms b) 3.0 mole S atoms c) 1.1 x 1048 mole S atoms

Molar Mass! 1 mole of Br atoms = 80.0 g/mole 1 mole of Sn atoms Find the molar mass (usually we round to a whole number) 1 mole of Br atoms 1 mole of Sn atoms = 80.0 g/mole = 119 g/mole

Molar Mass of K2O = ? Grams/mole Molar Mass II Molar Mass of K2O = ? Grams/mole B. Molar Mass of antacid Al(OH)3 = ? Grams/mole

Molar Mass Challenge Prozac, C17H18F3NO, is a widely used antidepressant that inhibits the uptake of serotonin by the brain. Find its molar mass.

Converting Moles and Grams Aluminum is often used for the structure of light-weight bicycle frames. How many grams of Al are in 3.00 moles of Al? 3.00 moles Al ? g Al

Converting II The artificial sweetener aspartame (Nutra- Sweet) formula C14H18N2O5 is used to sweeten diet foods, coffee and soft drinks. How many moles of aspartame are present in 225 g of aspartame?

Do Now: Create a word splash for “Mole” Attach related words to the end of each line—do as many as you can!

Converting III = 3.4 X 1023 atoms Cu How many atoms of Cu are present in 35.4 g of Cu? 35.4 g Cu 1 mol Cu 6.02 X 1023 atoms Cu 63.5 g Cu 1 mol Cu = 3.4 X 1023 atoms Cu

Converting IV What is the mass (in grams) of 1.20 X 1024 molecules of glucose (C6H12O6)?

Converting V—Challenge Question How many atoms of O are present in 78.1 g of oxygen? 78.1 g O2 1 mol O2 6.02 X 1023 molecules O2 2 atoms O 32.0 g O2 1 mol O2 1 molecule O2

Lab—all about the mole! Read the directions at each station before you begin. Follow them fully and record your data! Complete all calculations after measuring EVERYTHING! Measurements must be completed in 4 minutes or less!

Remember tutoring! 2:30 to 3:15 Today!!!

Do Now: Describe how you would solve for the molar mass of H2O2. Describe how you set up a conversion problem—how do you know what unit should be on the top? The bottom?

Quick Quiz 15 minutes to complete the quiz! Show all work to earn full credit and TRY every problem All other quiz/test procedures apply as usual!

Let’s get excited about… The Science Fair

Science Fair Lab Info: Groups of no more than THREE! Final project product (ppt) must be turned in by December 8th. This nine weeks you must generate a testable and SIGNIFICANT hypothesis, a list of materials and resources needed, a procedure as well as an image that will represent your experimental design! Recommendation—start a google doc just for this project! Share it with me: stephanie.n.morris@gmail.com

Today: Goal: Generate a testable and significant hypothesis that follows the format below: If we ______________________ we believe that we will find that ________ ________________________________________ because _________________. This study is of great significance because___________________________ __________________________________________________________________. Resource 1: (no .coms allowed) Resource 2: (use your phones) Resource 3: (skim the articles ONLY)

Topical Science Fair Ideas Idea Splash: Topical Science Fair Ideas

Do a little research: ID your partners (if you want them—you can’t go to state or the international fair with partners) Choose your idea from our IDEA SPLASH Research that topic Keywords: [insert topic name] studies, [insert topic name] experiments, [insert topic name] news Try out sites like: Google Scholar, Jstor, etc. (websites created for scholarly work and the scholars who read them!)

Set up your hypothesis: If we ______________________ we believe that we will find that ________ ________________________________________ because _________________. This study is of great significance because___________________________ __________________________________________________________________. Resource 1: (no .coms allowed) Resource 2: (use your phones) Resource 3: (skim the articles ONLY)

Closing: Show me your work as I monitor the room and find a SAFE place for it to remain until MONDAY! MONDAY—you will work on your materials and procedure needed!