Electrical Energy and Capacitance

MR. SURRETTE VAN NUYS HIGH SCHOOL

CHAPTER 2: MATTER AND ENERGY WORKSHEET

Equations: Tc = T – 273.15, TF = (9/5) Tc + 32, Tc = (5/9) (TF – 32), D = m/V Conversions: 1 cal = 4.184 J, 1 Calorie = 1 kcal = 1000 c, 1 kwh = 3.6 x 106 J, 1 kJ = 1000 J

PART I. Determine if the following substances are: pure element, pure compound, homogeneous mixture, or heterogeneous mixture.

1. NaCl (s) 2. Sugar water (aq) 3. Copper oxide (s) 4. Copper wire (s)

PART II. Indicate whether each of these is a physical or a chemical change:

5. Dry ice at room temperature 6 An iron nail rusts in the backyard 7. Copper becomes copper oxide

PARTIII. Answer the following.

8. This state of matter ( solid, liquid, or gas) has the least restricted motion. 9. This state of matter usually has the highest density. 10. Water found on earth’s surface at 280 K is in this state of matter. 11. These solids have a definite geometric pattern with repeating units. 12. Anything that takes up space and has mass. 13. Temperature is a form of this type of energy. 14. The amount of energy required to raise the temperature of one gram of water one degree Celsius.

PARTIV. Solve the following problems. Show all work.

15. Convert 459 J into Calories. [ANS: 1.10 x 10-1 C]

16. Convert 217 Calories into kwh. [ANS: 2.52 x 10-1 kwh]

17. Convert 4589 calories into kilojoules. [ANS: 1.920 x 101 kJ]

18. Convert 92 kwh into Calories. [ANS: 7.9 x 104 C]

19. Convert 100.3o F to Celsius [ANS: 37.94 oC]

20. Convert – 60.0o C to Kelvin [ANS: 213 K]

21. Convert 78.0o F to Kelvin [ANS: 299 K]

22. A solid cube 3 cm on a side has a mass of 40 g. What is its density ? [ANS: 1.5 g/cm3]

CHEMISTRY SCIENCE DEPARTMENT MR. SURRETTE VAN NUYS HIGH SCHOOL

CHAPTER 2: MATTER AND ENERGY HEAT CAPACITY AND TRANSFORMATION HANDOUT

HEAT CAPACITIES

Substance Calories per Degree per Gram Calories per Degree per Mole

CaCO2 0.205 20.52

H2O(liquid) 1.000 18.02

H2O(solid) 0.485 8.74

MgO 0.208 8.38

Pb 0.031 6.32

Fe 0.108 6.01

Al 0.213 5.74

HEATS OF TRANSFORMATION FOR H2O

Associated Calories per Calories per Change of State Energy Term Gram Mole Heat Flow

Solid  Liquid Heat of fusion 79.8 1436 Absorbed

Liquid  Solid Heat of 79.8 1436 Released crystallization Liquid  Gas Heat of 539.4 9715 Absorbed vaporization Gas  Liquid Heat of 539.4 9715 Released condensation

CHEMISTRY SCIENCE DEPARTMENT