[Chemistry 2 Homework Packet Answer Key] / Chapter 2- Energy & Matter
#1. / Phys. Prop. / Phys. Change / Chem. Prop. / Chem. Change
Pond… / X
Puddle / X
Alcohol / X
Blue / X
Boiling / X
Burning / X
Butter / X
Can… / X
Cracking / X
Cutting / X
Density / X
Digestion / X
Dissolving / X
Flammability / X
Glass / X
Hardness / X
Iron / X
Is reactive / X
Leaves / X
Lighting / X
Luster / X
Magnetizing / X
Melting / X
Melting pt. / X
Mowing / X
Odor / X
Paint / X
Solubility / X
Sour taste / X
Stretching / X
Supports / X
Water boils / X
Will form… / X
Wood rot… / X

#2. No

#3. Yes

#4. Yes

#5. Heat Energy. How? Temperature= Constant

#6. Movement increases, particles lose rigidity and move about each other.

#7. Movement increases, particles move farther apart from each other.

#8. Remains the same/ changes/ remains the same/ changes

#9.Temperature increases

#10. Vapor

#11. Increases

#12. Heat Energy

#13. Density increases

#14. Density decreases

#15. No

#16. E

#17. 0°C

#18. 5 Minutes

#19. 100°C

#20. Temp. is constant, heat energy increases/ Temp. is constant, heat energy increases

#21. At both phases changes temperature remains constant while heat energy was increasing

#22. 11/12 minutes

#23. 30°C

#24. 70°C

B / D / A
D / A / A
C / D / B
C / B / B
D / D / C
D / D / A
C / D / A
C / D / B
B / C

#25.

#26a. Water is boiling and separating from the solution.

b. a different distillate will begin to condense.

c. A new distillate compound is being separated and collected.

d. 3. There were three separate boiling points reached.

e. This is a solid residue which was unnoticed in the original solution because it was completely dissolved.

#27a. Filtration b. Filtration c. Crystallization d. Distillation e. Chromatography f. Distillation

#28. Magnetism. Iron filings will be attracted to the magnet whereas the Aluminum filings will not.

#29. Filter sand; distill alcohol, oil & water.

#30.

H / Hg
He / B
Li / Al
Na / C
K / Si
Be / Sn
Mg / Pb
Ca / N
Sr / P
Ba / As
Cr / Sb
W / O
Mn / S
Fe / F
Ni / Cl
Pd / Br
Pt / I
Cu / Ne
Ag / Ar
Au / Kr
Zn / Xe
Cd / Rn

#31.

# MOLECULES / # IND. ATOMS / # TOT. ATOMS
a) / 2 / Na:2, H:2, C:2, O:6 / 12
b) / 1 / Mg:1, O:2, H:2 / 5
c) / 3 / H:9, P:3, O:12 / 24
d) / 1 / N:3, H:12, P:1, O:4 / 20
e) / 1 / C:6, H:12, O:6 / 24
f) / 4 / Ca:4, C:4, O:12 / 20
g) / 2 / Al:4, O:6 / 10
h) / 1 / N:1, H:5, O:1 / 7
i) / 3 / Ba:3, O:6, H:6 / 15
j) / 1 / C:2, H:6, O:1 / 9
k) / 4 / Ca:4, Cl:2, O:6 / 12
l) / 1 / Al:2, S:3, O:12 / 17
m) / 1 / Cu:1, S:1, O:4 / 6
N) / 3 / N:6, H:24, S:3, O:12 / 45

#32. Energy

#33. Radiant

#34. Potential

#35. Joule

#36. Created/ Destroyed

#37. Kinetic

#38.F C B A E D

#39.

a) / 320 / b) / -61
c) / 1273 / d) / -241
e) / 253 / f) / 3847
g) / 173 / h) / 28

REVIEW:

#40. Matter

#41. Solids/Liquids

#42. Chemical/ Physical

#43. 1500°C

#44. 1500°C

#45. 2750°C

#46. 2750°C

#47. Solid

#48. Solid

#49. Liquid

#50. Gas

#51. Stays constant

#52. Stays constant

#53. 293K

#54. 1337K

#55. Boiling Point, Melting Point, Freezing Point, Density, Color, Odor, Luster, Brittle, hardness, taste, magnetism, etc.

#56. Reacts with acid/base, Flammable, Rusts, Solubility, etc.

#57.

a) / P
b) / P
C) / C
d) / C
e) / P
f) / P
g) / C
h) / C
i) / P
j) / C

#58.

Homogeneous or Heterogeneous / Element, Compound, Mixture, Solution
Salt Water / Homo / Solution
Iron / NA / Element
Salt / NA / Compound
MgBr / NA / Compound
Choc. Chip / Hetero / Mixture
Ocean Water / Homo / Solution
Carbon Diox. / NA / Compound
Manganese / NA / Element
Paint / Hetero / Mixture
Snickers Bar / Hetero / Mixture

#59. Mixture is separated by physical means whereas Compounds are bonded together and require chemical means of separation techniques.

#60. Mixtures can be seen with the naked eye whereas solutions have small particles that cannot be seen. Mixtures will show the Tyndall Effect and solutions will not. Solutions are uniform in compositions whereas Mixtures are not uniform. Similarities: both mixtures and solutions are not chemically bonded. Both mixtures and solutions can be separated by physical means. Both are classifications of matter.

#61. Elements are atoms of only ONE kind whereas compounds are TWO or MORE atoms chemically bonded together. Compounds can be chemically decomposed whereas elements cannot be broken down any further. Similarities: they are both pure substances.

#62a. 4 b. 12 c. 48 d. 4 e. 16 f. 84

CUMMULATIVE REVIEW

#63. 0.15

#64a. 5 b. 3 c. 2

#65. D.1000g/1kg = 1

#66. 54g

#67. 1.0420%

#68. 4.5x10-6km