CHEM 111 Final Exam 53 Questions with Verified Answers,100% CORRECT
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Course
CHEM 111
Institution
CHEM 111
CHEM 111 Final Exam 53 Questions with Verified Answers
Know your significant figure rules - CORRECT ANSWER ALL zeroes between non-zero numbers are ALWAYS significant.
ALL zeroes which are SIMULTANEOUSLY to the right of the decimal point AND at the end of the number are ALWAYS significant.
ALL ...
CHEM 111 Final Exam 53 Questions with Verified Answers
Know your significant figure rules - CORRECT ANSWER ALL zeroes between non-
zero numbers are ALWAYS significant.
ALL zeroes which are SIMULTANEOUSLY to the right of the decimal point AND at
the end of the number are ALWAYS significant.
ALL zeroes which are to the left of a written decimal point and are in a number >=
10 are ALWAYS significant.
define calorimetry - CORRECT ANSWER the act of measuring heat required or
evolved during a chemical process
know how to calculate the amount of energy produced using E= m∙c ∙deltaT -
CORRECT ANSWER E= energy [J]
m= mass [kg]
c= specific heat capacity
delta t= change in temp
Define what is meant by a small calorie "c" and food calorie "C" - CORRECT
ANSWER calorie= amount energy needed to raise temperature of one gram of
water by one degree C
1 food cal= 1000 small cal= 1 Kcal
When walking, an average person burns 0.453 Food Calories/ mile-pounds. How
many food calories does a 150-pound person burn after walking a mile? If a
peanut realizes 5.7 Food Calories/g and an average peanut weighs about 1 gram,
then how many peanuts will you have to eat to walk a mile? - CORRECT ANSWER
((0.453 Food Calories)/mile-pounds)x150 lbs x 1 mile= 67.95 Cal
67.95 Cal x (1peanut/5.6 Food Calories)= 13
Define spectroscopy - CORRECT ANSWER study of the interactions of
electromagnetic radiation with matter
Explain the difference between a line and continuous spectrum, and give an
example of a source of each type - CORRECT ANSWER Continuous spectrum
, contains all frequencies within a region of the electromagnetic spectrum.
produced by the sun and heated solids e.g.- sun
Line spectrum- contains only certain frequencies and produced by excited atoms
in the gas phase. e.g.- neon lamp
What kind of energy transitions were observed in experiment 2: spectroscopy? -
CORRECT ANSWER Balmer Series (380-750 nm)
Describe the term "white-light", and know the wavelength range (in nm). List the
colors of the spectrum from highest to the lowest frequency - CORRECT ANSWER
small band of radiation that can be seen by the human eye.
400-800 nm
violet>blue>green>yellow>orange>red
(high to low)
Purpose of typical "discharge tube" - CORRECT ANSWER used to see visible
radiation. it results in the emission of light that can be analyzed by a spectroscope
The glass tube is attached to the high voltage system. When it is turned on, fast
moving e- shoot through the gas (at low pressure) from cathode to anode. Energy
is transferred from the e- to the gas atoms and the e- are excited to higher energy
levels. The return on the excited atoms results in the emission of light.
Explain the effect on the spectrum of changing a) the slit width b) the distance
from the source of light to the spectrum - CORRECT ANSWER a) changes width of
the spectral lines viewed through spectroscope
b) changes the intensity of the light
Outline in a few sentences how you calibrated your spectroscope - CORRECT
ANSWER viewed a known light source and recorded line spectra that was found
per line units. we then plotted a graph of wavelength vs. distance. We used a best
fit line to find our slope and calibration equation.
Given wavelengths of light determine: a) frequencies and energies b) use Bohr
equation to calculate the wavelengths expected for the Balmer series of the
hydrogen atom c) be able to quantitatively compare the results of a) and b)- i.e.
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