CHEM 120 FINAL EXAM 2
1. Work
Answer: A result of a force moving an object a certain distance.
2. kinetic energy
Answer: the energy of motion
3. potential energy
Answer: stored energy that results from the position or shape of anobject
4. Law of Conservation of Energy
Answer: Energy cannot be created or destroyed
5. Energy can be from one type to another.
Answer: Transferred
6. Exothermic
Answer: Energy is releasedReleases heat
7. Endothermic
Answer: Absorbs heat
Transfers energy from surroundings to system
8. chemical energy
Answer: A form of potential energy that is stored in chemical bondsbetween atoms.
9. Energy Units (3)
Answer: calories, joules, kilowatt-hour
,10. 1 mole equals
Answer: 6.02 x 10^23
11. Avogadro's number
Answer: number of representative particles in a mole, 6.02 X 10^23
12. The value of the mol is equal to...
Answer: The number of atoms in exactly 12 gramsof pure C-12
13. Molar mass (M)
Answer: The mass in grams of 1 mole of the substance
14. Waves
Answer: Repeating disturbances of a medium that propagate away from the pointof
origin.
Transmits energy but no matter
15. Wavelength
Answer: The distance between two identical points in consecutive cycles
16. Frequency
Answer: The number of cycles that pass through a point in a given unit oftime
(cycles/sec= Hz)
17. Amplitutde
Answer: The height of a wave
18. speed of light
Answer: 3.00 x 10^8 m/s
, 19. energy is proportional to
Answer: frequencyE=hv
20. h is Planck's constant
Answer: 6.626* 10^-34
21. Einstein's photoelectric effect
Answer: Metals emit electrons when light shines onthem
For certain colors of light (redder), no electrons emitted regardless of intensityFor
other colors(blue) , electrons emitted even at low intensity
22. Light behaves like a beam of photons
Answer: Energy of a photon= E= hv
23. line spectrum
Answer: a spectrum showing only certain discrete wavelengths
24. The Bohr Model
Answer: atom placed electrons in "planet-like" orbits around the nucleus of an atom
Electrons mode in orbitals of specific radii around the nucleus corresponding to
discrete energy levels
25. dimensional analysis
Answer: a way to analyze and solve problems using the units, ordimensions, of the
measurements
26. The interaction between waves
Answer: Interference
27. constructive interference
Answer: The interference that occurs when two waves com-bine to make a wave
with a larger amplitude
1. Work
Answer: A result of a force moving an object a certain distance.
2. kinetic energy
Answer: the energy of motion
3. potential energy
Answer: stored energy that results from the position or shape of anobject
4. Law of Conservation of Energy
Answer: Energy cannot be created or destroyed
5. Energy can be from one type to another.
Answer: Transferred
6. Exothermic
Answer: Energy is releasedReleases heat
7. Endothermic
Answer: Absorbs heat
Transfers energy from surroundings to system
8. chemical energy
Answer: A form of potential energy that is stored in chemical bondsbetween atoms.
9. Energy Units (3)
Answer: calories, joules, kilowatt-hour
,10. 1 mole equals
Answer: 6.02 x 10^23
11. Avogadro's number
Answer: number of representative particles in a mole, 6.02 X 10^23
12. The value of the mol is equal to...
Answer: The number of atoms in exactly 12 gramsof pure C-12
13. Molar mass (M)
Answer: The mass in grams of 1 mole of the substance
14. Waves
Answer: Repeating disturbances of a medium that propagate away from the pointof
origin.
Transmits energy but no matter
15. Wavelength
Answer: The distance between two identical points in consecutive cycles
16. Frequency
Answer: The number of cycles that pass through a point in a given unit oftime
(cycles/sec= Hz)
17. Amplitutde
Answer: The height of a wave
18. speed of light
Answer: 3.00 x 10^8 m/s
, 19. energy is proportional to
Answer: frequencyE=hv
20. h is Planck's constant
Answer: 6.626* 10^-34
21. Einstein's photoelectric effect
Answer: Metals emit electrons when light shines onthem
For certain colors of light (redder), no electrons emitted regardless of intensityFor
other colors(blue) , electrons emitted even at low intensity
22. Light behaves like a beam of photons
Answer: Energy of a photon= E= hv
23. line spectrum
Answer: a spectrum showing only certain discrete wavelengths
24. The Bohr Model
Answer: atom placed electrons in "planet-like" orbits around the nucleus of an atom
Electrons mode in orbitals of specific radii around the nucleus corresponding to
discrete energy levels
25. dimensional analysis
Answer: a way to analyze and solve problems using the units, ordimensions, of the
measurements
26. The interaction between waves
Answer: Interference
27. constructive interference
Answer: The interference that occurs when two waves com-bine to make a wave
with a larger amplitude
