CHEM 111 Lab Exam 188 Questions with Verified Answers,100% CORRECT
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Course
CHEM 111 Lab
Institution
CHEM 111 Lab
CHEM 111 Lab Exam 188 Questions with Verified Answers
Experiment 1: check-in and orientation - CORRECT ANSWER
accuracy - CORRECT ANSWER the closeness of a measurement to the true value of the quantity that is measured
precision - CORRECT ANSWER the closeness of agreement of two or more me...
CHEM 111 Lab Exam 188 Questions with Verified Answers
Experiment 1: check-in and orientation - CORRECT ANSWER
accuracy - CORRECT ANSWER the closeness of a measurement to the true value of
the quantity that is measured
precision - CORRECT ANSWER the closeness of agreement of two or more
measurements of the same quantity
lab safety equipment locations - CORRECT ANSWER eyewash fountain = by
blanket in corner
first aid kit = by fume hood
safety shower = by fire blanket
fire extinguisher = by entrance
fire blanket = by eyewash fountain
personal vent = on desk
fume hood = side of entrance
exits = both entrances
spill-kit station = by first-aid kit
hazards for ethyl alcohol - CORRECT ANSWER red = 3 (flammability)
blue = 2 (health hazard)
yellow = 0 (physical hazard)
white = 0 (personal protection)
analytical balance - CORRECT ANSWER a device for determining mass that gives
highly accurate measurements; always tare before use
notebook guidelines - CORRECT ANSWER - record in black or blue pen
- legible writing
- write steps, observations, table, etc.
- do not rip out pages
- do not erase (cross out w/ line)
,- consistent headers (date, name, experiment)
spectroscopy - CORRECT ANSWER the study of the interaction of electromagnetic
radiation with matter; when matter absorbs energy, the matter will often emit
some form of electromagnetic radiation
experiment 2: spectroscopy - CORRECT ANSWER
electromagnetic spectrum - CORRECT ANSWER used to describe lots of different
kinds of energy that all travel at the speed of light
white light - CORRECT ANSWER sample that contains all wavelengths of visible
light; does not have any discernible color; 400-750 nm
absorption - CORRECT ANSWER if an atom absorbs energy, the electron can move
to a higher energy level referred to as the excited state
emission - CORRECT ANSWER if an atom has an electron in an excited state, when
it returns to ground state energy is released
wavelength ranges of colors in white light - CORRECT ANSWER violet = 400-430
nm
blue = 430-490 nm
green = 490-570 nm
yellow = 570-590 nm
orange = 590-640 nm
red = 640-750 nm
photon energy = (lowest) radio waves, microwaves, infrared, visible, ultraviolet, x-
rays, gamma (highest)
, diffraction grating - CORRECT ANSWER sheet of transparent plastic with many tiny
grooves on the surface; it works by letting light pass straight through it, when light
is projected onto the plastic; light is then diffracted at different angles and
wavelengths
diffraction equation - CORRECT ANSWER dsinθ = nλ
d = 1/N
N = number of lines per mm
θ = angle of diffraction
n = which order (number of dot on wall)
λ = wavelength
d = distance between slits
spectroscope calibration - CORRECT ANSWER by observing standard fluorescent
light bulbs and measuring the location of emission lines for known wavelengths;
make graph between relationships of wavelengths of mercury emission spectrum
and the corresponding positions on the graph; the equation for the line of best fit
serves as calibration
rydberg equation - CORRECT ANSWER ΔE = Ry (1/ni^2 - 1/nf^2)
Ry is 2.18 x 10^-18 joules
ni is initial and nf is final = electron transition
(only for hydrogen or hydrogen-like)
emission colors of various salts - CORRECT ANSWER copper sulfate (CuSO4) =
green
lithium chloride (LiCl) = red
sodium chloride (NaCl) = orange
potassium chloride (KCl) = purple
strontium chloride (SrCl2) = red
calcium chloride (CaCl2) = orange
frequency example - CORRECT ANSWER speed of light (c) / wavelength (in m) = #
Hz or s^-1
wavelength (nm) = # x 10^-7 m
speed of light (c) = 3.00 x 10^8 m/s
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