1. Moles are a Chemist Best Friend Chapter 10
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2. Objectives: Moles are a Chemist Best Friend
I can identify what a mole is in chemistry.
I can convert between moles and representative particles of substances.
I can convert between moles and mass of substances.
I can calculate the percentage composition of substances.

3. Measuring Matter What are three ways we can measure matter? 1. 2. 3.
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4. Measuring Apples
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5. Grouping Matter Easy way to measure all matter. r500
Gross of pencils= 144
Dozen dougnuts= 12
Ream of paper = 500
Byte of information storage= 4 bits

6. Grouping Matter
How do scientists’ group the representative particles that make-up matter?
Representative particles: substances that make-up matter.
Examples:
Atoms
Ionic Compounds
Molecules (covalent cmpds.)
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7. Classification of Matter7

8. Grouping Representative Particles
A mole is used to group representative particles.
1 mole = 6.02x1023 representative particles
(Avogadro’s Number)
“The Mole is a Unit Song” (nclark.net)

9. Mole Map

10. Converting Moles to Representative Particles
Ex. Propane (C3H8) is a gas used for cooking and heating. How many molecules of propane is equal to 2.4 moles of propane?

11. Convesion: Representative Particles to Moles
Ex. Magnesium is a light metal used in the manufacture of aircraft and automobile wheels. How many moles of magnesium equals 1.25x1023 atoms of magnesium?

12. Mole Map

13. Bell Ringer: Moles
Define and give two examples of a representative particle.
a. What is a mole?
b. How many atoms are in a mole of Cu?
How many moles are in 4.65x1024 molecules of CO2 ?

14. Conversions: Mole-Representative Particles (Homework Problems Key)
1.2x1024 molecules (2sig. Figs)
9.0x1023 molecules (2 sig figs)
4.5x1023 molecules (2 sig figs)
9.0x1024 molecules (2 sig figs)
2.1x1023 molecules (2 sig figs)
moles (3 sig figs)
2.00 moles (3 sig figs)
2.5x10-4 moles (2 sig figs)
5.6x102 moles (2 sig figs)
1.2x10-4 moles (2 sig figs)

15. Conversion: Mole-Representative Particles Homework Problems

16. Converting Moles to Mass
How do we convert from moles to mass?

17. Objectives: Moles are a Chemist Best Friend
I can identify what a mole is in chemistry.
I can convert between moles and representative particles of substances.
I can convert between moles and mass of substances.
I can calculate the percentage composition of substances.

18. Mole-Mass Conversion

19. Mole Map

20. Converting Moles to Mass
How do we convert from the moles of a substance to the mass of a substance?

21. Conversion: Moles- Mass
Mole-Mass Conversion:
1 mole of a substance = molar mass of the substance
Molar mass = substance’s atomic mass in grams

22. Molar Mass of an Element
Molar mass = element’s atomic mass(grams)
Round atomic mass to tenths place.
Ex. A mole of sulfur has a molar mass of?
Ex. A mole of sodium has a molar mass of?

23. Molar Mass of a Compound
Molar mass = sum of the elements’ atomic masses in the compound
Need chemical formula to calculate the molar mass of a compound.
Ex. A mole of NaCl has a molar mass of?
Ex. A mole of H2O has a molar mass of?

24. Bell Ringer: Chemistry
What is the representative particle for each substance below? (atom, ionic compound, or molecule)
a. Na2O b. Fe c. H d. Ne
How many atoms are in 2.5 moles of copper?
a. What is the molar mass of silver, Ag?
b. What is the molar mass of Al2(CO3)3?

25. Mole Packet Questions

26. Mole-Mass Conversions
1 mole = molar mass of substance
Ex. When iron is exposed to air, it corrodes to form red-brown rust. How many moles of iron (III) oxide are contained in 92.2g of pure Fe2O3?

27. Mole Map

28. Mole-Mass Conversions
Ex. What is the mass of 9.45 moles of aluminum oxide? (1 mole = molar mass of a substance)

29. Mole Map

30. Mole Conversions Mole to Particle Conversion:
1 mole = 6.02x1023 particles (atoms or cmpds)
Mole to Mass Conversion:
1 mole = molar mass of the substance (grams)

31. Mole Map

32. Bubble Gum Lab
Purpose: Practice mole conversions and calculate the % composition of sugar in bubble gum.

33. Mole Map

34. Chemical Quantities Objectives (Chpt.10)
I can identify what a mole is in chemistry.
I can convert between moles and representative particles of substances.
I can convert between moles and mass of substances.
I can calculate the percentage composition of substances.

35. Bell Ringer: Mole Conversions
Define “mole”.
Name the representative particle of each substance. (atom, molecule, ionic compound)
oxygen gas b. sodium sulfide
potassium d. sulfur dioxide
What is the molar mass of a substance?
What is the conversion needed for each problem below?
mole to representative particle conversion?
mole to mass conversion?

36. Chemical Quantities Quiz Questions

37. Fun with Moles Review
Purpose: Work together in groups to competitively review mole conversion calculations learned before spring break.

38. Moles Conversion Review Worksheet
1.8x1024 atoms
a. 40.3g b. 74g c. 78g d.96 g
mole AgCl
0.35 mole Cu(OH)2
0.258 mol SiO2
51 gH2O2
120 g
1,040 g C5H12
52.7 g Cu

39. Mole Map

40. Mole Conversions: 2 step problems
How many molecules are there in 100 grams of CCl4 ?
2. How many grams do 1.2x1021 molecules of BCl3 weigh?

41. Mole Conversions: 2 step Problems

42. Mole Conversion Lab
Problem: How many molecules are present in a tablespoon of the following substances?
sodium chloride
water
calcium carbonate
Design and conduct an experiment that will help you solve this problem. Make sure to include a hypothesis, data section, and conclusion.

43. Mole Conversion Lab Questions

44. Mole Map

46. Percentage Composition of a Compound
Percent of mass each element contributes to the compound’s molar mass.
How do we calculate % composition of a compound?

47. % Composition from Chemical Formula
% mass of element =
Ex. Propane, C3H8 is one of the compounds obtained from petroleum and is used to fuel homes and gas grills. Calculate the percent composition of propane.

48. % Composition of Compound
1. What is the % composition of each element in the following compound, Al(NO2)3 ?
2. What is the mass of Al in 6.5 g of Al(NO2)3 ?
(Hint: use % composition data to solve problem)

49. Mole Conversions: 2 step Problems

50. Bell Ringer: Chemical Quantities
1. If a sample contains 2.34x1023 atoms of mercury, how much does it weigh in grams?

51. % Composition as a Conversion Factor

52. % Composition as a Conversion Factor
What is the mass of Al in 6.5 g of Al(NO2)3 ?

53. % Composition as a Conversion Factor
What is the mass of N in 6.5 g of Al(NO2)3 ?
What is the mass of O in 6.5 g of Al(NO2)3?

54. Bell Ringer: Chemical Quantities
How many grams are in 5.0 moles of Cs3N ?
2.How many moles are in 3.7x1021 cmpds. of NaCl?
What is the % composition of Cu2(SO4)?
4. How many grams of Cu are in 9.8 g of Cu2(SO4)?

55. Infinite Campus Update
Mole Conversion Lab 10pts.
Chemical Reaction Lab Rough Draft 20pts.

56. Formal Lab Reports: Final Copy Computer Lab Days
Periods
Wed.
(4/25)
Thurs.
(4/26)
Fri.
(4/27)
Mon.
(4/30)
1st
Library
2nd
3rd
Rm 323
4th
6th
7th

57. Hydrate Lab

58. Hydrate Lab
Hydrate: Cu(SO4) . H2O
Anhydrous salt: Cu(SO4)

59. Mole Map

60. Objectives Chemical Quantities Test today.
Hydrate Lab tomorrow-read procedures
Bring Chemistry Textbook tomorrow

61. Chemical Quantities Test
Choose one of the molar mass problems to calculate.
Test A and B qts10. calculate % composition of C16H18N2O4S; omit qts. 12.
Test C and D: qts 10 caculate % composition of Fe(CH3O2)2; omit qts. 11