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Moles are a Chemist Best Friend Chapter 10

Moles are a Chemist Best Friend Chapter 10. nclark.net. 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.

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Moles are a Chemist Best Friend Chapter 10

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  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 rainycity.com stockphotos.it 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 • (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 atomsof magnesium?

  12. Mole Map

  13. Bell Ringer: Moles • Define and give twoexamples of a representative particle. • a. What is a mole? b. How many atoms are in a mole of Cu? • How many moles are in 4.65x1024molecules 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 = 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. 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 • 0.407 moles • 1.8x1024 atoms • a. 40.3g b. 74g c. 78g d.96 g • 0.0417 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

  45. 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?

  46. % 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.

  47. % 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)

  48. Mole Conversions: 2 step Problems

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

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