MR. SURRETTE
VAN NUYS HIGH SCHOOL
CHAPTER 2: MATTER AND ENERGY
WORKSHEET SOLUTIONS
1. NaCl (s)
1A. Sodium chloride is a pure compound.
2. Sugar water (aq)
2A. Sugar water is homogeneous mixture.
3. Copper oxide (s)
3A. Copper oxide is a pure compound.
4. Copper wire (s)
4A. Copper wire is a pure element.
5. Dry ice at room temperature
5A. physical change
6 An iron nail rusts in the backyard
6A. chemical change
7. Copper becomes copper oxide
7A. chemical change
8. This state of matter has the least restricted motion.
8A. gas
9. This state of matter usually has the highest density.
9A. solid
10. Water found on earth’s surface at 280 K is in this state of matter.
10A. liquid
11. These solids have a definite geometric pattern with repeating units.
11A. crystalline
12. Anything that takes up space and has mass.
12A. matter
13. Temperature is a form of this type of energy.
13A. kinetic
14. The amount of energy required to raise the temperature of one gram of water one degree Celsius.
14A. calorie
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CHEMISTRY
MR. SURRETTE
VAN NUYS HIGH SCHOOL
15. Convert 459 J into Calories.
15A.
(1) 459 J x 1 c
x 1C
= 0.109703633 C
-----------------4.184 J
1000 c
-1
(2) 1.09703633 x 10 C
(3) 1.10 x 10-1 C
16. Convert 217 Calories into kwh.
16A.
(1) 217 C x 1000 c x 4.184 J x 1 kwh
-----------------------------1C
1c
3.6 x 106 J
(2) 2.519611111 x 10-1
(3) 2.52 x 10-1 kwh
17. Convert 4589 calories into kilojoules.
17A.
(1) 4589 c x 4.184 J x 1 kJ
= 19.200376 kJ
----------------1c
1000 J
(2) 1.9200376 x 101 kJ
(3) 1.920 x 101 kJ
18. Convert 92 kwh into Calories.
18A.
(1) 92 kwh x 3.6 x 106 J x
1c x
1C
---------------------- --------1 kwh
4.184 J
1000 c
4
(2) 7.915869981 x 10 C
(3) 7.9 x 104 C
19. Convert 100.3o F to Celsius
19A.
(1) Tc = (5/9) (TF – 32)
(2) Tc = (5/9) (100.3 – 32)
(3) Tc = (5/9) (68.3)
(4) Tc = 37.94444444 oC
(5) Tc = 37.9 oC
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CHEMISTRY
MR. SURRETTE
VAN NUYS HIGH SCHOOL
20. Convert – 60o C to Kelvin
20A.
(1) Tc = T – 273
(2) T = Tc + 273
(3) T = (- 60o) + 273
(4) T = 213 K
(5) T = 213 K
21. Convert 78o F to Kelvin
21A.
(1) Tc = (5/9) (TF – 32)
(2) Tc = (5/9) (78 – 32)
(3) Tc = (5/9) (46)
(4) Tc = 25.555555555556 oC
(5) T = Tc + 273
(6) T = 25.555555555556 oC + 273
(7) T = 298.5555556 K
(8) T = 299 K
22. A solid cube 3 cm on a side has a mass of 40 g. What is its density ?
22A.
(1) Vcube = s3
(2) V = (3 cm)3
(3) V = 27 cm3
(4)  = m / V
(5)  = 40 g / 27 cm3
(6)  = 1.481481 g/cm3
(7)  = 1.5 g/cm3
23. Calculate the calories required to heat 750 grams of lead from 15oC to 82oC.
23A.
(1) From the Heat Capacities data table:
Pb = 0.031 cal/deg/gm
(2) 750 g Pb (0.031 cal/deg)
------------------ = 23.25 cal/deg
1g
(3) 67oC (23.25 calories)
------------------- = 1558 calories
1oC
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CHEMISTRY
MR. SURRETTE
VAN NUYS HIGH SCHOOL
24. Calculate the calories required to change 325 grams of ice at - 55oC to water at 70oC.
24A.
Ice: - 55oC  0oC
(1) From the Heat Capacities data table:
H2O(solid) = 0.485 cal/deg/gm
(2) 325 g Ice (0.485 cal/deg)
------------------ = 157.6 cal/deg
1g
(3) 55oC (157.6 calories)
------------------ = 8668 calories
1oC
Solid  Liquid:
(4) From the Heats of Transformation data table:
H20 heat of fusion = 79.8 cal/gm
(5) 325 g H2O (79.8 calories)
----------------- = 25,935 cal
1g
Water: 0oC  70oC
(6) From the Heat Capacities data table:
H2O(liquid) = 1.000 cal/deg/gm
(7) 325 g Water (1.000 cal/deg)
------------------1g
= 325 cal/deg
(8) 70oC (325 calories)
----------------- = 22,750 calories
1oC
(9) Total calories: 8668 calories + 25,935 calories + 22,750 calories
(10) Total calories = 57,353 calories
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CHEMISTRY
MR. SURRETTE
VAN NUYS HIGH SCHOOL
CHAPTER 2: MATTER AND ENERGY
QUIZ SOLUTIONS
Questions 1 - 3. Calculate the following and show your answer in scientific notation.
1.
1A.
(1)
(2)
(3)
(4)
2.
4.052 m + 3.8328 m
------------------------81.0 x 10-4 m
(4.052 m + 3.8328 m) / 81.0 x 10-4 m
(7.8848 m) / 81.0 x 10-4 m
973.34320988
9.73 x 102
(23.06 x 107 ft 2) (5.100 x 10-4 ft)
-----------------------------------------4963 ft
2A.
(1) (23.06 x 107 ft2)(5.100 x 10-4 ft) / 4963 ft
(2) 23.6965545 ft2
(3) 2.370 x 101 ft2
3. A baking recipe calls for 2.5 quarts of milk. What is this in cm3? (1 L = 1.057 qt)
3A.
(1) 2.5 qt x
1L
x 1000 mL x 1 cm3
-------------------- --------1.057 qt
1L
1 mL
3
3
(2) 2.365184484 x 10 cm
(3) 2.4 x 103 cm3
Questions 4 - 6. Indicate whether these statements describe a physical or a chemical property.
4. The boiling point of ethanol is 78o C.
4A. physical property
5. Sugar dissolves in tea when it is mixed.
5A. chemical property
6. Carbon monoxide, a poisonous gas, is formed when cars use gasoline.
6A. chemical property
Questions 7 - 10. Indicate whether each of these is a physical or a chemical change.
7. Cutting a piece of metal.
7A. physical change
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CHEMISTRY
MR. SURRETTE
VAN NUYS HIGH SCHOOL
8. The fogging of your car window on a rainy day.
8A. physical change
9. A dog farts.
9A. chemical change
10. Removing alcohol from beer.
10A. chemical change
Questions 11 - 14. Determine if the following substances are: (a) pure or mixture (b) element,
compound, homogeneous, or heterogeneous.
11. Baking soda (sodium bicarbonate)
11A. Baking soda is a pure compound.
12. Clear apple juice
12A. Clear apple juice is a homogeneous mixture.
13. Chocolate sundae
13A. A chocolate sundae is a heterogeneous mixture.
14. Aluminum foil
14A. Aluminum foil is a pure element.
Questions 15 - 19. Solve the following problems.
15. Convert 20,125 calories into kilojoules.
15A.
(1) 20,125 c x 4.184 J x 1 kJ
= 84.203 kJ
----------------1c
1000 J
(2) 8.4203 x 101 kJ
16. Convert 142 kwh into Calories.
16A.
(1) 142 kwh x 3.6 x 106 J x 1 cal
x
1C
----------------------------------1 kwh
4.184 J
1000 cal
(2) 1.221797323 x 105 C
(3) 1.22 x 105 C
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CHEMISTRY
MR. SURRETTE
VAN NUYS HIGH SCHOOL
17. Convert – 80o C to Kelvin
17A.
(1) TC = T – 273
(2) T = TC + 273
(3) T = (- 80o) + 273
(4) T = 193 K
18. A solid cube 4 cm on a side has a mass of 55 g. What is its density ?
18A.
(1) Vcube = s3
(2) V = (4 cm)3
(3) V = 64 cm3
(4)  = m / V
(5)  = 55 g / 64 cm3
(6)  = 0.859375 g/cm3
(7)  = 8.59375 x 10-1 g/cm3
(8)  = 8.6 x 10-1 g/cm3
Questions 19 - 23. Answer the following questions.
19. This state of matter has the most restricted motion.
19A. solid
20. This state of matter usually has the lowest density.
20A. gas
21. Water found on the earth’s surface at 300 K is in this state of matter.
21A. liquid
22. Temperature is a form of this type of energy.
22A. kinetic
23. The amount of energy required to raise the temperature of one gram of water one degree Celsius.
23A. calorie
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CHEMISTRY