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 representative particles of matter and moles. I can convert between the mass of matter and moles. I can convert between the volume of matter and moles.

3. Chemistry (4/8) Infinite Campus Update: • Chemical Reaction Exam (raw avg. 62%) • Chemical Reaction Study Guide (10pts.)-optional Objectives: • Address Chemical Reaction Exam • Discuss Science Reflection Article • Identify what a mole is in chemistry. Homework: • Review Chemical Rxtn. Notes/Complete Study Guide • Science Reflection Article-due Friday • Need calculator for new unit- The Mole

4. Science Reflection Article Select one article to read on my webpage: a. “Drivers, Start Your (Electric) Engines!” “Green Gasoline: Fuel From Plants” Complete annotation and evaluation questions. Due: Friday, April 12th

5. Chemical Reaction Exam • Chemical Exam Make-up Questions-Fri.

6. Chemistry (4/9) Objectives: • Review endothermic vs. exothermic energy diagrams • Identify what a mole is in chemistry. Homework: • Mole Problems. (Bring calculator for this unit!) • Review chemical reaction notes/practice problems. • Science Reflection Article-due Friday • Chemical Reaction Make-up Qts-Friday

7. Energy Diagram Does this represent an endothermic or exothermic reaction? (H) (time)

8. Energy Diagram • H reactant > H product • More energy will be released in this reaction • Small activation energy (H) (time)

9. Energy Diagram Does this represent an endothermic or exothermic reaction? Activation Energy (H) (time)

10. Endothermic Energy Diagram • H reactant < H product • More energy is absorbed in this reaction • Large activation energy Activation Energy

11. Chemistry (4/9) Objectives: • I can identify what a mole is in chemistry. • I can convert between representative particles of matter and moles. Homework: • Chemical Reaction Review-due Fri. • Science Reflection Article-due Fri.

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

13. Objectives: Moles are a Chemist Best Friend • I can identify what a mole is in chemistry. • I can convert between representative particles of matter and moles. • I can convert between the mass of matter and moles. • I can convert between the volume of matter and moles.

14. Measuring Matter What are three ways we can measure matter? 1. 2. 3. hermitwoods.com

15. Measuring Apples www.123rf.com stockphotos.it flickr.com

16. Grouping Matter • Easy way to measure all matter. r Gross of pencils= Dozen dougnuts= Ream of paper = Byte of stored information=

17. Grouping Representative Particles • How would scientists group representative particles of matter? Representative particles: the substances that make-up matter. nclark.net

18. Classification of Matter

19. Grouping Representative Paraticles • How would we group representative particles that make-up matter? Representative particles: substances that make-up matter. (atoms, molecules or ionic compounds) nclark.net

20. Grouping Representative Particles A mole is a unit of measurement that is used to group representative particles. • 1 mole = 6.02x1023 representative particles • (Avogadro’s Number) • “The Mole is a Unit” song (nclark.net)

21. Mole Conversion Map http://mysite.cherokee.k12.ga.us

22. Chemistry (4/10) Objectives: • I can identify what a mole is in chemistry. • I can convert between moles and representative particles of matter. Homework: • Mole Conversion Problems-due Thurs. • Chemical Reaction Review-due Fri. • Science Reflection Article-due Fri.

23. Bell Ringer: Moles • a. What is a representative particle? b. Give two examples of representative particles. • a. What is a mole? b. How many atoms of Cu are in a mole of Cu?

24. Mole Conversion Map http://mysite.cherokee.k12.ga.us

25. 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?

26. Mole Conversion Map http://mysite.cherokee.k12.ga.us

27. 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?

28. Mole Conversion Map http://mysite.cherokee.k12.ga.us

29. Conversion: Mole-Representative Particles Homework Problems

30. A Mole is a Chemist Best Fried wks. When calculating mole conversions…. • Show work so errors can be identified and corrected. • Multiply what your given by the conversion fraction. They are NOT equal or proportional to one another. • If dividing scientific notation values, place parenthesis around the value in the denominator when plugging in calculator. • Express answer with correct number of significant figures (sigs.); units.

31. Chemistry (4/11) Objectives: • I can convert between moles and representative particles of matter. • I can convert between moles and mass of matter. Homework: • Mole Conversion Problems-Fri. • Chemical Reaction Review-due Fri. (optional) • Science Reflection Article-postpone Mon. Friday: Chemical Reaction Make-up Qts. (16qts )

32. Conversion: Mole-Representative Particles Homework Problems

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

34. Mole Conversion Map http://mysite.cherokee.k12.ga.us

35. Conversion: Moles- Mass • Mole-Mass Conversion: 1 mole of a substance = molar mass of the substance

36. Molar Mass of an Element • molar mass of element = atomic mass of element • Round atomic mass to tenths place. Ex. A mole of sulfur (S) has a molar mass of? Ex. A mole of sodium (Na) has a molar mass of?

37. Molar Mass of a Compound • molar mass of compound = 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?

38. Molar Mass of Compounds

39. Mole-Mass Conversions Ex. How many moles are in 2.5 grams of Cu? Ex. How many grams are in 3.8 moles of FeO?

40. Chemistry (4/15) Due Today: • Science Reflection Article qts. Infinite Campus Update: • Chemical Reaction Make-up Qts.(optional) • Moles are a Chemist’s Best Friend Wks. (5pts.) Objectives: • Calculate molar mass of a substance. • Convert between moles and mass of a substance. Homework: • Mole Packet

41. 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? 3.a. What is the molar mass of silver, Ag? b. What is the molar mass of Al2(CO3)3?

42. Chemistry (4/16) Objectives: • Calculate molar mass of a substance. • Convert between moles and mass of a substance. Homework: • Mole Conversion Worksheet *Quiz: Friday -mole conversions

43. Conversions: Mole-Mass Ex. How many moles of iron (III) oxide are contained in 92.2g of pure Fe2O3? Ex. How many grams are in 2.68 moles of Fe2O3?

44. Mole-Mass Conversions

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

46. Chemistry (4/17) Objective: • Discuss qts. over homework (mole conversions) • Mole Conversion Lab Homework: • Complete Mole Conversion Lab post questions.

47. Mole Conversions

48. Mole Conversion Lab Purpose: Practice mole conversions with substances in the lab. Hypothesis: How many particles are in a tablespoon of each of the following substances? • H2O • Ca(CO3) • NaCl

49. Mole Conversion Map http://mysite.cherokee.k12.ga.us

50. Chemistry (4/18) Objective: • Calculate 2-Step Mole Conversions • Address questions over Mole Conversion Lab Homework: • 2-Step Mole Conversion Problems *Quiz tomorrow: mole conversions