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Moles are a Chemist Best Friend Chapter 10

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Moles are a Chemist Best Friend Chapter 10 nclark.net * Chemical Quantities Objectives (Chpt.10) I can identify what a mole is in chemistry. I can convert between ... – PowerPoint PPT presentation

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Title: Moles are a Chemist Best Friend Chapter 10


1
Moles are a Chemist Best FriendChapter 10
nclark.net
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.

hermitwoods.com
4
Measuring Apples

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flickr.com
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.)

nclark.net
7
Classification of Matter
8
Grouping Representative Particles
A mole is used to group representative particles.
  • 1 mole 6.02x1023 representative particles
  • (Avogadros 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)
  • 1. 1.00 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 substances atomic mass in grams

22
Molar Mass of an Element
  • Molar mass elements 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. H2 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. 0.407 moles
  2. 1.8x1024 atoms
  3. a. 40.3g b. 74g c. 78g d.96 g
  4. 0.0417 mole AgCl
  5. 0.35 mole Cu(OH)2
  6. 0.258 mol SiO2
  7. 51 gH2O2
  8. 120 g
  9. 1,040 g C5H12
  10. 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
45
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46
Percentage Composition of a Compound
  • Percent of mass each element contributes to the
    compounds 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 CopyComputer Lab Days
Periods Wed. (4/25) Thurs. (4/26) Fri. (4/27) Mon. (4/30)
1st Library Library
2nd Library Library
3rd Rm 323 Rm 323
4th Rm 323 Rm 323
6th Library Library
7th Library
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
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