C: 2 Nov  Objective: SWBAT show what you know about the language of chemistry on a test, and convert between atoms/molecules and moles of an element.  Do now: What type of question are you most confident about?  What type of question are you least confident about?

C: Agenda I. Do now II. Test! Language of Chemistry III. The Mole – notes IV. Converting between moles and number of atoms and moles and mass V. Practice Problems Homework: Week 9 Homework: #1-26: Weds. Bring your calculator EVERY day!! Calculator check = 10 point quiz tomorrow!

A: 2 November 2010  Take Out Homework: Week 8 Test Review  Objective: SWBAT show what you know about the language of chemistry on a test.  Do now (in your notebook): What type of question are you most confident about?  What type of question are you least confident about?

A: Agenda I. Do now II. Test! Language of Chemistry Homework: Bring a calculator EVERY day! Calculator check = 10 point quiz tomorrow!

Test  The periodic table is on the last page.  You can rip it off if you’d like.  When you are finished, turn your test over on your desk.  Work on something silently  Missed work for chem, work for another class, read a book, etc…  Remain silent, even if you are finished!

A: 3 Nov  Take out your calculator!  Objective: SWBAT convert between atoms/molecules and moles and mass of an element.  Do now: (In your notebook) We buy eggs by the dozen, and shoes by the pair. Name at least two other things that you buy in multiples (that is, more than one at a time).

Agenda I. Do now, calculator check II. Notes on the Mole, converting between moles and number of atoms/particles III. Practice Problems IV. Converting between moles and mass of elements V. Practice Problems Homework: Week 9 Homework #1-34 odds: Thurs.

Announcement  I’m going to underline the things you should write down.  If it’s not underlined, don’t write it down.

 New Unit: Stoichiometry  The calculation of the amounts of matter used in a chemical reaction and produced by a chemical reaction.  H 2 (g) + O 2 (g)  H 2 O(g)  If 5 grams of hydrogen is reacted with 5 grams of oxygen, how many grams of water will be formed? Will any hydrogen or oxygen be left over? How much?

The Mole  Atoms are so tiny; how do we quantify their masses?  We communicate the mass of atoms in terms of really, really huge groups of atoms.  6.02x10 23 atoms, to be exact!

The Mole  Mole: The scientific unit for amount of substance  =6.02x10 23 atoms or molecules  =Avogadro’s Number

How big is a mole?  Enough soft drink cans to cover the surface of the earth to a depth of over 200 miles.  If you had Avogadro's number of unpopped popcorn kernels, and spread them across the United States of America, the country would be covered in popcorn to a depth of over 9 miles.  If we were able to count atoms at the rate of 10 million per second, it would take about 2 billion years to count the atoms in one mole.

Really? How big?  1 mole of pennies could be distributed to all the currently-living people of the world so that they could spend a million dollars per hour every hour (day and night) for the rest of their lives.  1 mole of blood cells would be more than the total number of blood cells found in every human on earth.

Amadeo Avogadro  Italian  Born: 1776  Studied physics and math  Taught high school, then college

Converting between moles and atoms/molecules  Two possible conversion fractions Same two fractions for ANY element or compound!!

Example 1  How many moles are equal to 3.50x10 23 atoms of silver?

Example 2  How many moles are equal to 1.25x10 24 molecules of sodium bromide?

Example 3  How many atoms are there in 1.50 moles of sulfur?

Example 4  How many molecules are there in moles of water?

1. How many moles of silver are equal to 3.01 x atoms of silver? 2. How many moles of water are equal to 2500 molecules of water? 3. How many atoms of carbon are in 3.2 moles of carbon? 4. How many molecules of calcium chloride are in 1.0 mole of calcium chloride?

C: 8 November 2010  Take Out Homework: Week 9 #1-18 and your calculator!  Objective: SWBAT convert between atoms, moles and mass of elements.  Do now: Choose and write the correct fraction to convert if…  a. The problem gives you atoms and asks for moles.  b. The problem gives you moles and asks for atoms.

Agenda I. Do now, calculator check II. Homework answers III. Convert between moles and mass of elements IV. Convert between atoms, moles, and mass of elements Homework: Week 9 Homework #19-34: Weds.

Converting between moles and mass of elements  Two possible conversion fractions:

Example 1  Calculate the mass in grams of 3.50 moles of hydrogen.

Example 2  Calculate the number of moles equal to 10.0 grams of silicon.

1. What is the mass in grams of 3.50 mol of copper? 2. What is the mass in grams of 2.25 mol of iron? 3. How many moles of aluminum are equal to 11.9 grams of Aluminum? 4. How many moles of calcium are equal to 5.00 grams of calcium?

A: 4 Nov  Take Out Homework: Week 9 Homework #1-26 odds  Objective: SWBAT convert from mass to moles to atoms and calculate molar mass.  Do now: a. Calculate the number of moles equal to 5.00x10 25 atoms of gold. b. Calculate the mass of 5.00 moles of gold.

Agenda I. Do now II. Homework check III. Mass to moles to atoms examples and problems IV. Calculating molar mass examples and problems Homework: Week 9 Homework #27-38: Mon.

Mass to moles to atoms  Ex 1: Calculate the mass of 8.00x10 23 atoms of gold.  Ex 2: Calculate the number of atoms in 5.00 grams of bromine.

1. Calculate the mass of 3.01x10 25 atoms of copper. 2. Calculate the number of atoms in 10.0 grams of lithium. 3. Calculate the mass of atoms of zinc. 4. Calculate the number of atoms in grams of beryllium.

C: Homework  Week 9 Homework #19-34: Weds.  Bring calculator every day!  Finish Ex. 2

C: 10 Nov  Take Out Homework: Week 9 #19-34  Objective: SWBAT convert between mass, moles and number of atoms of an element  Do now: Calculate the mass of 500. atoms of cobalt.

Agenda I. Do now II. Homework check III. Using the electronic balance IV. Mass to moles to atoms stations Homework: Fix Week 9 #1-34

Using an electronic balance  Press “on” and WAIT until the balance reads  If the display is already on and does not read “0.00,” press “zero.”  Gently place the item to be massed on the metal plate.  Record the mass as soon as it stops changing with TWO decimal places (ex: 4.50 g).

Using an electronic balance  Treat these balances with extreme care!  They cost about $250 each.  Never place anything directly on the metal plate, including your fingers, or push on the metal plate!  Press buttons gently.  If a problem occurs, let me know immediately.

Mass to moles to atoms lab  On the front:  Find the mass of the sample. Subtract the mass of the container (given on the card).  Convert to moles  Convert to number of atoms  Always show units!

 On the back:  Copy down the number of atoms (from the card)  Convert to moles  Convert to mass  Check your answer by massing the sample on the balance.

Homework  Week 9 Homework: Check #1-34  Mass, moles, atoms lab: Finish, check for units and element symbols  We’ll do the last station on Fri.  Due Fri.

Do your best!  Work carefully and quickly!!  Low grades result from sloppy work, not showing work, not writing down units and wasting time during labs.  This is a 1 st quarter grade!  5 min. per station.

Homework  Check and fix Week 9 Homework #1-34

C: Homework  Week 9 Homework #19-34

C: 12 Nov  Take Out Homework: Lab Stations  Objective: SWBAT calculate the molar mass of a compound and convert between mass, moles and molecules of a compound.  Do now: (8 min.) a. Copy the objective. b. Finish your last station from yesterday. c. Hand in the lab worksheet

C: Agenda I. Do now (finish lab stations, hand in!) II. Citizenship rubric III. Calculating molar mass: Examples and problems. IV. Converting between mass, moles and number of molecules of a compound: Examples and problems V. Mixed Practice Homework: Week 9 Homework #27-44 (bonus optional): Mon.  Front of the mixed practice worksheet: Mon.  Quiz Tuesday!

Molar Mass and Conversions  How do you convert between moles and mass of a compound?!

Calculating Molar Mass  The mass of one mole of a compound.  Units: g/mol  Example 1: NaCl  Example 2: aluminum carbonate  Example 3: C 8 H 10 N 4 O 2 (caffeine!)

Calculate the molar mass… 1. lithium bromide 2. carbon dioxide 3. acetic acid (CH 3 COOH, the acid in vinegar)

Converting between moles and mass of compounds  Example 1  Calculate the mass of 4.52 moles of lithium bromide.

Example 2  Calculate the number of moles equal to 1.00 grams of aluminum carbonate.

Example 3  Calculate the mass of moles of acetic acid.

Practice Problems 1. Calculate the mass of 20.0 moles of lithium bromide. 2. Calculate the number of moles equal to grams of aluminum carbonate. 3. Calculate the mass of moles of acetic acid.

Mass to moles to molecules Ex. 1: Calculate the mass of 12,000. molecules of lithium bromide. Ex. 2: Calculate the number of molecules of aluminum carbonate in 100. grams of the compound.

Practice Problems 1. Calculate the mass of 3.00x10 20 molecules of lithium bromide. 2. Calculate the number of molecules of aluminum carbonate in 45.0 grams of the compound. 3. Calculate the mass of 1,200.0 molecules of acetic acid. 4. Calculate the number of molecules of acetic acid in 10.0 grams of the compound.

Mixed practice worksheet  With your partner, review all the types of conversions problems  Finish the front by the end of the period!

C: Homework  Week 9 Homework #27-44: Mon.  Front of the mixed practice worksheet: Mon.  Quiz Tuesday!

A: 12 Nov  Take Out Homework: Week 9 #35-44  Objective: SWBAT practice converting between mass, moles and number of atoms/molecules of elements and compounds.  Do now: (in your notebook) What is a mole?

A: Agenda I. Do now II. Homework check III. Citizenship rubric IV. Mixed Practice Conversions Worksheet V. Conversions Game! Homework: Week 9 Homework #45-50 (bonus optional): Mon. Finish Mixed Practice Classwork: Mon. Quiz: Mon.

Citizenship rubric: on your own:  Rank your PREPARATION for class:  4: Regularly prepared  3: Rarely unprepared  2: Preparation always at least minimally done  1: Preparation minimal or missing  0: Often missing assignments

 Rank your PARTICIPATION  4: On task, actively participating, helping others stay focused  3: Participates often and actively  2: Participates at least minimally  1: Minimal or negative  0: Behavior interferes with own or others’ learning

 Rank your DISCIPLINE:  4/3: No discipline issues  2: Could demonstrate minor challenges, but no major discipline issues  1: Influences others to be off-task, has had incident reports or repeated discipline issues  0: Repeated behavior and discipline issues

 Rank your OVERALL citizenship  4: Exemplary  3: Above expectations  2: Meets expectations  1: Does not meet expectations  0: Not acceptable

C: 15 Nov  Take Out Homework: Week 9 Homework #27-44, Front of the mixed practice worksheet  Objective: SWBAT practice moles conversions for a quiz tomorrow!  Do now: How many molecules are in grams of carbon dioxide?

Agenda I. Do now II. New Seats III. Homework check IV. Review: Back of mixed practice worksheet V. Review game! Homework: Finish Week 9 Homework, including the “Optional” bonus Quiz tomorrow Bring a calculator and a PTE!

New Seats  Let me know after class if your seat may be a problem.

“Cheat Sheet” for the quiz  How do you solve a moles conversion problem?  Which fraction do you use?  What steps do you follow?  For the quiz, you can bring a small index card with directions on how to convert.  One side only  (It can not include examples, but may include Avogadro’s number.)

20 min.  Complete the back of the mixed practice worksheet.  If you finish early, make a “cheat sheet.”

A: 15 Nov  Take Out Homework: Week 9 AND Mass – Moles – Atoms/Molecules Conversions Mixed Practice  Objective: SWBAT show what you know about moles conversions on a quiz!  Do now: (in your notebook) Calculate the molar mass of magnesium nitrate.

Agenda I. Do now II. Homework/mixed practice solutions III. ??? IV. Quiz Homework: None!

MOLES CONVERSIONS STATIONS Directions

 When you receive a sample, find the correct box on your worksheet.

Instructions  Front side:  A. Find the mass of the sample (subtract the mass of the container)  B. Convert the mass to moles.  C. Convert the moles to number of atoms or molecules.

 Back side:  A. Record the number of atoms or molecules on the card.  B. Convert that to moles.  C. Convert moles to mass (grams).  D. Find the mass of the sample (subtract the mass of the container), and compare to your calculated mass.

 Work quickly. 7 minutes per station!  Pass the sample and card to the next table when the timer goes off.  Due at the end of the period.

Practice Moles to Number of Atoms Conversions 1. How many moles of vanadium are in 4.5 x 10 2 atoms of V? 2. How many moles of oxygen gas are in 45,000 molecules of O 2 ? 3. How many moles of neon are in 1.2 x 10 3 atoms of Ne? 4. How many moles of chromium are in 7.90 x atoms of Cr?

Atoms to Moles  How many atoms of sodium are in 0.5 moles of sodium?  How many atoms of oxygen are in 1.5 moles of oxygen?  How many atoms of fluorine are in moles of fluorine?  How many atoms of argon are in 3.45 moles of argon?

Converting between mass (g) and moles (mol) 1 mol O g O  Or g O 1 mol O  Choose one depending on if you are given grams of oxygen or moles of oxygen.

 Lithium (Li)  Calculate the mass of 3.0 moles of lithium.  How many atoms are there in 3.0 moles of lithium?

 Chromium (Cr)  Calculate the number of moles of chromium if you had 3.25x10 34 atoms of chromium.  Calculate the mass of 3.25x10 34 atoms of chromium.

 Zinc (Zn)  How many moles of zinc are there in 34.7 grams of zinc?  How many atoms of zinc in 34.7 grams?

Write both fractions.  Germanium (Ge)  Calculate the mass of 3.0 moles of germanium.  How many atoms is that?

Which Fraction?  How many moles of chlorine are in 6.4 grams of chlorine?

Which Fraction?  How many grams of krypton are in 8.9x10 12 moles of krypton?  How many atoms is that?

Which Fraction?  How many grams of hydrogen are in 32.1 atoms of hydrogen?  How many moles is that?

Which Fraction?  How many moles of aluminum are in 6.5 grams of aluminum?

Which Fraction?  What is the mass of 5.6x10 3 moles of mercury?  How many atoms is that?

Write both fractions.  How many moles are equal to 2.58x10 67 atoms of Xenon (Xe)?  Calculate the mass.

Which Fraction?  How many moles of Xe are in 9.0 grams of Xe?  How many atoms is that?

Molar Mass Practice 1. What is the mass in grams of 3.50 mol of copper (Cu)? 2. What is the mass in grams of 2.25 mol of iron (Fe)? 3. What is the mass in grams of mol of potassium (K)? 4. What is the mass in grams of mol of sodium (Na)? 5. What is the mass in grams of 16.3 mol of nickel (Ni)?

 How many moles of Aluminum are in 11.9 grams of Aluminum?  How many moles of calcium (Ca) are in 5.00 grams of calcium?  How many moles of copper (Cu) are in 13.3 grams of Copper?  How many moles of gold (Au) are in 3.60 x grams of gold?

Mass to atoms 1. What is the mass in grams of 1.20 x 10 8 atoms of copper? 2. What is the mass in grams of 7.5 x atoms of nickel? 3. How many atoms of sulfur are in 4.00 grams of sulfur? 4. How many atoms of carbon are in 1500 grams of carbon?