Chem 111 psu final exam UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS
, calorie Amount of energy needed to raise temperature 1 gram of water 1 degree C
When walking, an average person burns .453 150 pounds .453 calories/milepound = 67.95
C/(mile*pounds). How many C does a 150-pound person
burn after walking a mile? If a peanut releases 5.7 C/g 67.5 calories * (1 peanut/5.7 calories) = about 12 grams of peanuts
and an average peanut weights about 1 gram, then how 12 peanuts
many peanuts will you have to eat to walk a mile?
Spectroscopy the original study of interaction of radiation and matter as a function of
wavelength
Continuous spectrum A spectrum of light within a certain wavelength (ex. visible light) with no breaks or
gaps.
possible source the sun
Line spectrum A line spectrum is an emission spectrum with only certain frequencies. It is
produced by excited atoms and ions as they fall back to a lower energy level.
Source tube of excited gaseous element for example a neon sign
What kind of energy transitions were observed in this electronic transitions
experiment? Balmer series transitions (380nm-750nm)
6 series describing the spectral line emissions of hydrogen
Describe white light and know the wavelength range as White light is the small band of radiation that can be see with the human eye.
well as listing the colors from highest to lowest frequency wavelength range is about 400nm-800nm and the highest frequency goes from
violet to indigo to blue to green to yellow to orange to red.
parts of a discharge tube gas at low pressure high voltage source and glass tube
Explain the purpose of setting up a discharge tube The purpose is to ionize the atoms or energize them so they emit light. This light
can then be viewed through a spectroscope where the wavelength will be
determined. Once determined the wavelength is used to figure out the element.
How does slit width and distance from source affect getting closer and having a wider slit can make the spectrum of a bight source
spectrum from a bright source. blurry.
How does slit width and distance from a source affect the Getting closer and having a wider slit will make the spectrum more distinct and
spectrum from a weak source clear.
Outline how to calibrate a spectrscope To calibrate a spectroscope first i will make a piece of labeled graph paper. Then I
will place it in the spectroscope. I will then use light which has known
wavelengths like violet at 436 green at 546 and yellow at 580. After i have found
out where this light is in relation to the graph lines I labeled i will make a graph
with a line of best fit. The line of best fit can be used to determine the wavelength
of light.
Equations used to calculate energy wavelength and the (a) E=hc/(lambda); v=c/(lambda)
Bohr equation (b) E=-R((ni)^-2 - (nf)^-2)
(c) E diff= abs( (first-second)/(.5(first + second)) *100%
, calorie Amount of energy needed to raise temperature 1 gram of water 1 degree C
When walking, an average person burns .453 150 pounds .453 calories/milepound = 67.95
C/(mile*pounds). How many C does a 150-pound person
burn after walking a mile? If a peanut releases 5.7 C/g 67.5 calories * (1 peanut/5.7 calories) = about 12 grams of peanuts
and an average peanut weights about 1 gram, then how 12 peanuts
many peanuts will you have to eat to walk a mile?
Spectroscopy the original study of interaction of radiation and matter as a function of
wavelength
Continuous spectrum A spectrum of light within a certain wavelength (ex. visible light) with no breaks or
gaps.
possible source the sun
Line spectrum A line spectrum is an emission spectrum with only certain frequencies. It is
produced by excited atoms and ions as they fall back to a lower energy level.
Source tube of excited gaseous element for example a neon sign
What kind of energy transitions were observed in this electronic transitions
experiment? Balmer series transitions (380nm-750nm)
6 series describing the spectral line emissions of hydrogen
Describe white light and know the wavelength range as White light is the small band of radiation that can be see with the human eye.
well as listing the colors from highest to lowest frequency wavelength range is about 400nm-800nm and the highest frequency goes from
violet to indigo to blue to green to yellow to orange to red.
parts of a discharge tube gas at low pressure high voltage source and glass tube
Explain the purpose of setting up a discharge tube The purpose is to ionize the atoms or energize them so they emit light. This light
can then be viewed through a spectroscope where the wavelength will be
determined. Once determined the wavelength is used to figure out the element.
How does slit width and distance from source affect getting closer and having a wider slit can make the spectrum of a bight source
spectrum from a bright source. blurry.
How does slit width and distance from a source affect the Getting closer and having a wider slit will make the spectrum more distinct and
spectrum from a weak source clear.
Outline how to calibrate a spectrscope To calibrate a spectroscope first i will make a piece of labeled graph paper. Then I
will place it in the spectroscope. I will then use light which has known
wavelengths like violet at 436 green at 546 and yellow at 580. After i have found
out where this light is in relation to the graph lines I labeled i will make a graph
with a line of best fit. The line of best fit can be used to determine the wavelength
of light.
Equations used to calculate energy wavelength and the (a) E=hc/(lambda); v=c/(lambda)
Bohr equation (b) E=-R((ni)^-2 - (nf)^-2)
(c) E diff= abs( (first-second)/(.5(first + second)) *100%
