Do now: How many meters are in.0025 mi? Do DPSE 100 cm=1m 2.54 cm = 1inch 12 inch= 1 ft 1 mi = 5280ft

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Emery Mosley
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1 Objectives: Welcome to Chemistry! Oct 19, 2015 Monday Do now: How many meters are in.0025 mi? Do DPSE 100 cm=1m 2.54 cm = 1inch 12 inch= 1 ft 1 mi = 5280ft St 4: Matter: Understand the structure of an atom in terms of its subatomic particles; isotopes and ions; differentiate between the classification and separation of matter (mixtures, pure substances ) Agenda: practice quiz on standard 4 Check off st 4 classwork Check off st 3 classwork (catch up) Intro standard 5 Assignments: HW: practice test #2 st 4 The Week: Tues. St4 practice test molar mass Wed. st4 assess plus st3 assess. Thurs. molar conversions

2 The mole

3 Symbol # of Protons # of Neutrons # of Electrons Net Charge Not Graded, Just Checking In.

4 CFA #5 Answers Symbol # of Protons # of Neutrons # of Electrons Net Charge Sr Te Cs

5 Classify the following as physical or chemical properties Butter is solid at room temperature Potassium reacts vigorously with water Pennies turn green with time Sodium Chloride appears white Water vaporizes above 100 C Dry ice (solid CO 2 ) sublimates at room temperature Methane is very flammable Ethanol has a sweet odor

6 Classify the following as a compound, element, homogenous mixture, or heterogeneous mixture Fresh squeezed Lemonade Lucky Charms Cereal Carbon Dioxide (CO 2 ) gas Neon gas Air Tap water Distilled Water Aluminum Foil

7 Describe what separation technique would be used to separate the following types of Sea water matter into simpler substances. Distilled water Heterogeneous mixtures Identify substances in a homogeneous mixture that may have the same boiling point Coffee grounds in hot water

8 Complete test on your own without any notes. Complete each question with your best guess or WRITE YOUR POINT OF CONFUSION e.g- I don t know how to determine the number of neutrons NO talking NO Notes USE YOUR PERIODIC TABLE

9 For questions you got wrong find the resource in your notes and highlight/edit your notebook create a small spot on your periodic table for key information that you can write on your table.

10 Standard 5: The Mole Standard 5: Demonstrate molar conversions between grams, moles, molecules, atoms and common forms of concentration (molarity)

11 SO, what is a mole anyway?

12 SO, what is a mole anyway?

13 SO, what is a mole anyway? It s an amount, a quantity, Just like a dozen BIG But, it s a REALLY quantity. 602,200,000,000,000,000,000,000 Or 6.022x10 23

The Mole 1 dozen cookies = 12 cookies 1 mole of cookies = 6.022 X 10 23 cookies 1 dozen cars = 12 cars 1 mole of cars = 6.

14 The Mole 1 dozen cookies = 12 cookies 1 mole of cookies = X cookies 1 dozen cars = 12 cars 1 mole of cars = X cars 1 dozen Al atoms = 12 Al atoms 1 mole of Al atoms = X atoms 1 dozen water molecules = 12 water molecules 1 mole of water molecules = X molecules Mole is abbreviated mol

15 But how big is that? Mass: 2.5g ONE PENNY Diameter: 19.05mm Height: 1.52mm Area =285mm 2 Volume: 433mm 2 = 4.33x10-7 m 3

16 But how big is that? mole of pennies (4.33x10-7 m 3 )(6.022x10 23 ) = 2.61x10 17 m 3 Land Area of Planet Earth=1.5x10 14 m x10 17 m 3 /1.5x10 14 m 2 = 1740m high on land area of planet earth 1609m=1mi so about 1.08miles high

17 But how big is that? Mass of a penny: 2.5g Mole of pennies: 1.51x10 21 kg Mass of Earth: 6.0x kg Earth is ~4000 times as massive as a mole of pennies Mass of Pluto: 1.3x10 22 kg Pluto is less than 10 times the mass of a mole of pennies

18 But how big is that? what if you stacked those pennies on top of each other flat side Height: 9.15x10 17 km Distance to Moon: ~385,000km 1.2 Trillion trips to the Moon and Back. Also,~97,000 Light Years The Milky Way Galaxy is ~100,000 LY across

19 What about $$$$? Give every person on Earth (7 Billion humans) an equal share. Have everybody spend $1 Million every DAY. When would they run out?

20 The Year 4375

21 Why use the mole? How much water is a mole of water? Swimming Pool? Lake? Ocean?

22 Why use the mole? How much water is a mole of water? Swimming Pool? Lake? Ocean?

23 Why use the mole? How many pennies does a mole of Copper atoms make? If Pennies were pure copper. Molar Mass of Cu: g/mol (1 Penny) (63.564g Cu) (2.5 g Cu) (1 mole Cu) ~25 Pennies/mol

24 Tools for Tomorrow Calculator Ions Sheet Periodic Table

25 Take practice test 2 home and practice, will be checked as homework tomorrow fy

26 Mole: contains as many molecules as the number of atoms in exactly 12 g of carbon-12. How many is that? Avogadro s Number: x molecules in one mole

27 If you were able to count at the rate of 1 million numbers a second, it would take about 20 billion years to count out one mole.

28 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.

29 What if you had a mole of pennies and you gave each individual in the world an equal share If each person spent one million dollars per day it would take 2,750 years for a person to squander away his or her fortune. However life would be quite uncomfortable though since we would be buried to a depth of 75meters in copper coins.

30 Enough soft drink cans to cover the surface of the earth to a depth of over 200 miles.

31 How big is a mole of water????

32 6.02 x mole of 12 C has a mass of 12 g

33 Objectives: Welcome to Chemistry! Oct 20, 2015 Tuesday Do now: What does compare and contrast mean?(for example Compare and contrast Physical changes with chemical changes) St 4: Matter: Understand the structure of an atom in terms of its subatomic particles; isotopes and ions; differentiate between the classification and separation of matter (mixtures, pure substances ) Agenda: Check of practice test 2 st 4 Intro standard 5 Assignments: Matter notes and practice St4 practice test 1 St4 Practice test 2 The Week: Tues. St4 practice test molar mass Wed. st4 assess plus st3 assess. Thurs. molar conversions Fri. practice molar

35 Create a new tab with Standard 5 Copy down Standard 5 on next page Standard 5: Demonstrate molar conversions between grams, moles, molecules, atoms and molarity (concentration )

36 6.02 x molecules of carbon = 1 mole 1 mole of 12 C has a mass of 12 g

02 X 10 23 cars 1 dozen Al atoms = 12 Al atoms 1 mole of Al atoms = 6.

37 1 dozen cookies = 12 cookies 1 mole of cookies = 6.02 X cookies 1 dozen cars = 12 cars 1 mole of cars = 6.02 X cars 1 dozen Al atoms = 12 Al atoms 1 mole of Al atoms = 6.02 X atoms 1 dozen water molecules = 12 water molecules 1 mole of water molecules = 6.02 X molecules Mole is abbreviated mol (gee, that s a lot quicker to write, huh?)

38 EQ: What is molar mass? (RIGHT SIDE)

39 Four Conversions: Mass(g) Moles Molar Mass Volume(l) Moles Molarity(M) (Concentration) Particles(atoms or molec) Moles Avogadro's Number (or, 1 mole) Particles(atoms or molec) Atoms

40 Mass (g) atoms Use formula to get number of atoms in 1 molecule/co mpound Liter (L) Particles Atom/molec Mole (mol)

41 Today: Mass Moles We know that atomic mass (A.M) is measured in amu. A.M. of Carbon is amu. How do we convert to grams? Mass of one atom= A.M. in amu Mass of one MOLE of atoms (Molar Mass) = A.M. in g Carbon MOLAR MASS = g Mass of Carbon 12.01(amu/atom) (g/mol)

42 Molar Mass of a Compound For a compound, add atomic mass for each atom in the compound So, the molar mass of calcium chloride, CaCl 2, (1 Calcium atom, 2 Chloride atoms) 1(40.08 amu Ca) + 2(35.45 amu Cl) = amu CaCl 2 But really g CaCl 2 1 atom CaCl 2 = amu 1 mole CaCl 2 = g meaning there are 6.022x10 23 molecules in a g sample of CaCl 2

43 St 5 abbreviations Mole - mol Molecule - molec Grams - g Liters - L

44 Mg 3 (PO 4 ) 2 Subscripts after chemical symbols tell you how many atoms of that element there are

45 Mg 3 (PO 4 ) 2 Parentheses with a number to the right of the parenthesis tell you how many of a group of atoms you have (usually an Ion)

46 Mg 3 (PO 4 ) 2 There are 3 Magnesium atoms There are two PO 4 ions, so (2x1)=2 P atoms (4x2)=8 O atoms!

47 Mg 3 (PO 4 ) 2 3(24.31g Mg) + 2(30.97g P) + 8(16.00g O) = g

48 Find the molar mass of: Some Practice Give it a try Chemical Formula What it is (just for fun) Au Pure 24K Gold O 2 NaCl Cu 2 SO 4 Ca(OH) 2 Oxygen about found in hospitals in tanks Table salt Pesticide Used in food prep/sewage treatment!

The Mole 6.02 X 10 23

The Mole 6.02 X 10 23 STOICHIOMETRY - the study of the quantitative aspects of chemical reactions. The Mole A counting unit Similar to a dozen, except instead of 12, it s 602 billion trillion 602,000,000,000,000,000,000,000