CHEM 111 FINAL PSU 2026 CERTIFICATION
EVALUATION PAPER QUESTIONS WITH
SOLUTIONS GRADED A+
⩥ 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
⩥ What kind of energy transitions were observed in this experiment?.
Answer: electronic transitions
Balmer series transitions (380nm-750nm)
6 series describing the spectral line emissions of hydrogen
⩥ 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%
EVALUATION PAPER QUESTIONS WITH
SOLUTIONS GRADED A+
⩥ 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
⩥ What kind of energy transitions were observed in this experiment?.
Answer: electronic transitions
Balmer series transitions (380nm-750nm)
6 series describing the spectral line emissions of hydrogen
⩥ 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%
