1. Heat and Temperature Matter Chemical and Physical Changes Atoms and Moles Potpourri 100100 9 100 100 10 100 100 5 100 100 6 100 100 7 100 200200 8 200 200 1 200 200 2 200 200 19 200 300300 12 300 300 3 300 300 4 300 300 13 300 400400 14 400 400 15,16,17 400 400 18 400 400 20,21,22,23 400 500 500 11 500

2. 100 Heat and Temperature Convert 6.6 o F to o C. Answer Answer

3. Answer: 100 Heat & Temp o C = ( o F – 32) ÷ 1.8 (6.6-32) ÷ 1.8 = -14.1 o C

4. 200 Heat and Temperature A unit of heat is: A.calories B. Joules C.degrees Celcius D.Both A and B E.All of the above Answer Answer

5. Answer 200 Heat and Temperature D. Both calories and Joules

6. 300 Heat and Temperature If a 75.0 mL sample of water cools from 24.8 o C to 20.0 o C, how much heat was transferred from the water in SI units? Answer

7. Answer: 300 Heat and Temperature Heat = sp ht x mass x ΔT Heat = 4.184J x 75.0g x (20.0 – 24.8 o C) g o C = -1.5 x 10 3 Joules

8. 400 Heat and Temperature A fish brought up from the deep ocean will experience a temperature change of 14 o C. What is this temperature change in o F? Answer

9. Answer 400 Heat and Temperature 25 o F

10. 500 Heat and Temperature Discuss three facts about the use of the Kelvin scale and the theoretical meaning of absolute zero. Answer

11. Answer: 500 Heat and Temperature It is mathematically useful because it has no negative numbers. The lowest theoretical temperature is 0K or Absolute Zero. At Absolute Zero, all molecular motion is believed to cease. Volume approaches zero. At 0K conductivity would be perfect (no heat loss)

12. 100 Matter What is the density of pure water at normal temperatures and pressures? (include units!) Answer

13. Answer:100 Matter density =1.00 g/mL

14. 200 Matter The ability of a metal to be drawn into wire is: A.Ductility B. Luster C. Conductivity D. Malleability E.Tensile Strength Answer

15. Answer:200 Matter A. Ductility

16. 300 Matter Which pair of particles has approximately the same mass? A.Protons and electrons B.Protons and neutrons C.Electrons and neutrons Answer

17. Answer: 300 Matter B. Protons and neutrons

18. 400 Matter Give the correct number for: The halogen group The period of the liquid nonmetal. The alkali metals group Answer

19. Answer: 400 Matter Halogens are group 17. The liquid nonmetal is bromine, found in the 4th period. Alkali Metals are group 1.

20. 500 Matter Discuss the types of mixtures that can be separated by the following methods: Decanting Distillation Evaporation Filtration Centrifugation Answer Answer

21. Answer: 500 Matter Decanting can separate top liquid layer in a suspension Distillation and evaporation can separate a liquid solution. The more volatile component evaporates/boils off first. Filtration can separate solid particles from liquid in a suspension. Centrifuging will separate components of colloids.

22. 100 Chemical and Physical Properties Which of the following describes mass but not weight? A.Quantity of matter B.Dependent on gravity C.Measured with a balance D.All of the above E.Both A and C Answer

23. Answer: 100 Chemical and Physical Properties E.Mass is a quantity of matter. It is measured with a balance. It is NOT dependent on gravity.

24. 200 Chemical and Physical Properties Describe the four indications that a chemical reaction has occurred. Define any scientific terms. Answer

25. Answer: 200 Chemical and Physical Properties Four indications of a chemical change are: 1.Color change 2.Formation of a precipitate (an insoluble solid formed from two liquids) 3.Production of a gas (observed as fizzing, bubbling) 4.Production of heat/light

26. 300 Chemical and Physical Properties Which of the following is a chemical change? A.Wax melting B.Iron rusting C.Eggs frying D.All of the above. E.Both B and C. Answer Answer

27. Answer: 300 Chemical and Physical Properties E. Iron rusting and Eggs frying. Wax melting is a phase change (physical)

28. 400 Chemical and Physical Properties For a bar of sodium metal, give: 2 intensive physical properties 1 chemical property 2 extensive properties Answer

29. Answer: 400 Chemical and Physical Properties Answers will vary but here are some examples. Intensive physical: silver color, solid at room temp, melts at 98 o C, density >1g/mL Chemical: reacts with water Extensive: 10.00 g, length of 3.50 cm, width of 0.55 cm

30. 500 Chemical and Physical Properties A chem class determined the density of a metal sample. Results are shown. Evaluate their precision. Find their accuracy. The true value for the density is 4.55 g/mL. Class results: 4.22 g/mL ± 0.88 g/mL Answer

31. Answer: 500 Chemical and Physical Properties Precision is poor 0.88/4.22 = 0.208 x 100 = 21% deviation Meaning the results have too wide a range. Accuracy is fair. % error = 4.22-4.55 x 100 = 7.3% 4.55

32. 100 Atoms and Moles Which pair of particles are isotopes of the same element? A. Ru and Rh B. Ne and Ne C. Dy and Dy D. Sg and Rf Answer Answer

33. Answer: 100 Atoms and Moles B. Ne and Ne Because they both have 10 protons = same element, yet they have different masses

34. 200 Atoms and Moles Which of the following pairs would be present in an element undergoing beta decay? A. Ru and Rh B. Ne and Ne C. Dy and Dy D. Sg and Rf Answer

35. Answer: 200 Atoms and Moles A. Ru and Rh Because emission of a beta particle increases the number of protons but does not change the mass.

36. 300 Atoms and Moles Given the balanced equation below, how many atoms are represented on the product side? What are the numbers after the symbol called and what do they mean? 2Fe + 3N 2 + 9O 2 2Fe(NO 3 ) 3 Answer Answer

37. Answer: 300 Atoms and Moles 2Fe(NO 3 ) 3 Fe = 2 N = 1x3x2=6 O = 3x3x2=18 Total = 26 atoms the small numbers are subscripts and indicate the number of only the element they come directly after.

38. 400 Atoms and Moles How many atoms would be in 1.00 mole of Neon? What is special about this number? Answer

39. Answer: 400 Atoms and Moles It is Avogadro’s number 6.02 x 10 23 atoms equals 1 mole.

40. 500 Atoms and Moles How many moles are in 8.55 x 10 25 molecules of N 2 ? Answer

41. Answer: 500 Atoms and Moles ? mole = 8.55 x 10 25 molecules X _______1mole__________ 6.02 x 10 23 molecules Answer = 142 moles

42. 100 Potpourri 1 cm 3 is equal to: A.1 mL B.1 mL 3 C.1 g D.1000 L Answer Answer

43. Answer: 100 Potpourri A. 1 mL

44. 200 Potpourri If 168 g of iron reacts with oxygen to form 232 g of rust, what mass of oxygen must have reacted? Answer

45. Answer: 200 Potpourri Law of Conservation of Mass 168 g of Fe + ? g of O 2 232 g of Fe 3 O 4 232-168 = 64 g of oxygen

46. 300 Potpourri Give the names of the 7 diatomic elements. Answer

47. Answer: 300 Potpourri HydrogenOxygen NitrogenChlorine BromineIodine Fluorine

48. 400 Potpourri For the element iron: A.How many protons? B.How many electrons? C.What is its atomic mass? (include units) D.How many neutrons in the most abundant isotope? Answer Answer

49. Answer: 400 Potpourri A.26 protons B.26 electrons C.Atomic mass = 55.85 u D.Most abundant isotope has a mass number of 56 thus has 30 neutrons.

50. 500 Potpourri Write the four phase subscripts used in a chemical equation and explain what each means. Answer

51. Answer: 500 Potpourri (g) as in HCl (g) means hydrogen chloride in the gas phase (l) as in H 2 O (l) means water in the liquid phase (s) as in Fe (s) means iron in the solid phase (aq) as in C 12 H 22 O 11(aq) means a solution of sugar dissolved in water = aqueous