Chem 111 Psu Final Exam Questions
with Guaranteed Pass Solutions 2025-
2026 Updated.
Define Calorimetry - Answer measurement of amount of heat evolved or absorbed in a
chemical reaction, change in state, or a formation of solution
What does the E m c and delta T stand for in E=mc(delta)T - Answer E- energy c- specific heat
constant m- mass or moles (delta T)- change in temperature
Small calorie(c) compared to Food Caloire(C) - Answer 1c=1000C 1
calorie - Answer Amount of energy needed to raise temperature 1 gram of water 1 degree C
When walking, an average person burns .453 C/(mile*pounds). How many C does a 150-pound
person burn after walking a mile? If a peanut releases 5.7 C/g and an average peanut weights
about 1 gram, then how many peanuts will you have to eat to walk a mile? - Answer 150
pounds * .453 calories/mile*pound = 67.95
67.5 calories * (1 peanut/5.7 calories) = about 12 grams of peanuts
12 peanuts
Spectroscopy - Answer the original study of interaction of radiation and matter as a function
of wavelength
Continuous spectrum - Answer A spectrum of light within a certain wavelength (ex. visible
light) with no breaks or gaps.
possible source the sun
Line spectrum - Answer 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
, Describe white light and know the wavelength range as well as listing the colors from highest to
lowest frequency - Answer White light is the small band of radiation that can be see with the
human eye. 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 - Answer gas at low pressure high voltage source and glass tube
Explain the purpose of setting up a discharge tube - Answer 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 spectrum from a bright source. - Answer
getting closer and having a wider slit can make the spectrum of a bight source blurry.
How does slit width and distance from a source affect the spectrum from a weak source -
Answer Getting closer and having a wider slit will make the spectrum more distinct and clear.
Outline how to calibrate a spectrscope - Answer 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 Bohr equation - Answer (a)
E=hc/(lambda); v=c/(lambda)
(b) E=-R((ni)^-2 - (nf)^-2)
(c) E diff= abs( (first-second)/(.5(first + second)) *100%
Explain the complementary nature of absorbed/observed colors - Answer the absorbed color
is the wavelength of light that the object matches like dissolves like and the observed colors is
the color that bounces off the substance
What is the fundamental reason why a substance absorbs visible light? - Answer The
electron jumps up a specific wavelength that corresponds to the electron transition energy
with Guaranteed Pass Solutions 2025-
2026 Updated.
Define Calorimetry - Answer measurement of amount of heat evolved or absorbed in a
chemical reaction, change in state, or a formation of solution
What does the E m c and delta T stand for in E=mc(delta)T - Answer E- energy c- specific heat
constant m- mass or moles (delta T)- change in temperature
Small calorie(c) compared to Food Caloire(C) - Answer 1c=1000C 1
calorie - Answer Amount of energy needed to raise temperature 1 gram of water 1 degree C
When walking, an average person burns .453 C/(mile*pounds). How many C does a 150-pound
person burn after walking a mile? If a peanut releases 5.7 C/g and an average peanut weights
about 1 gram, then how many peanuts will you have to eat to walk a mile? - Answer 150
pounds * .453 calories/mile*pound = 67.95
67.5 calories * (1 peanut/5.7 calories) = about 12 grams of peanuts
12 peanuts
Spectroscopy - Answer the original study of interaction of radiation and matter as a function
of wavelength
Continuous spectrum - Answer A spectrum of light within a certain wavelength (ex. visible
light) with no breaks or gaps.
possible source the sun
Line spectrum - Answer 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
, Describe white light and know the wavelength range as well as listing the colors from highest to
lowest frequency - Answer White light is the small band of radiation that can be see with the
human eye. 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 - Answer gas at low pressure high voltage source and glass tube
Explain the purpose of setting up a discharge tube - Answer 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 spectrum from a bright source. - Answer
getting closer and having a wider slit can make the spectrum of a bight source blurry.
How does slit width and distance from a source affect the spectrum from a weak source -
Answer Getting closer and having a wider slit will make the spectrum more distinct and clear.
Outline how to calibrate a spectrscope - Answer 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 Bohr equation - Answer (a)
E=hc/(lambda); v=c/(lambda)
(b) E=-R((ni)^-2 - (nf)^-2)
(c) E diff= abs( (first-second)/(.5(first + second)) *100%
Explain the complementary nature of absorbed/observed colors - Answer the absorbed color
is the wavelength of light that the object matches like dissolves like and the observed colors is
the color that bounces off the substance
What is the fundamental reason why a substance absorbs visible light? - Answer The
electron jumps up a specific wavelength that corresponds to the electron transition energy
