CHEM 150 Quiz Test Exam 004 paper GRADED A+ Question & Answers 2023/2024 Verified
List Symbols of the following SI units and their conversion factors
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Giga
Mega
Kilo
Hecto
Deka
deci
centi
milli
micro
nano
pico
femto correct answers Giga = G = 10^9
Mega = M = 10^6
Kilo = k = 10^3
Hecto = h = 10^2
Deca = da = 10^1
deci = d = 10^-1
centi = c = 10^-2
milli = m = 10^-3
micro = u = 10^-6
nano = n = 10^-9
pico = p = 10^-12
femto = f = 10^-15
Identify mass number, atomic number and element symbol on the following picture correct answers
What is an isotope? correct answers elements with same # of protons but different # of neutrons (and therefore different mass numbers)
How do you find atomic mass? correct answers Atomic Mass = Sum of (mass of isotope)(% abundance)
What is percent abundance? What is relative intensity? correct answers Percent Abundance - Takes relative ratio and shows how much is present in nature. Ex: Br-79 and Br-81 have a ratio of 1:1 therefore in nature 50% of Br found is 79Br other 50% is 81Br
Relative Intensity - Highest mass is set at 100% all other ion masses are set relative to that 100%
SHOWS A RATIO
Define the 3 characteristics of waves
1) Wavelength
2) Frequency
3) Amplitude correct answers 1) Wavelength - distance between crests and troughs
2) Frequency - number of waves that pass through a particular point
3) Amplitude - vertical distance from the midline of the wave to the top of the peak or bottom of trough
Explain the Double Slit Experiment. What does it serve as evidence for? correct answers When light passes through a double slit, it does so constructively (waves intersect) and destructively (waves do not intersect)
It serves as evidence for the wave-like nature of electrons
Explain the Photoelectric Effect. What does it serve as evidence for? correct answers When light (photons) hits a metal the photons must have enough energy to meet the threshold frequency. If the threshold frequency is met, energy is passed onto an electron and the electron is ejected from the metal's surface.
Light frequency < threshold: NO electrons removed
Light frequency = threshold: Most loosely held electrons are dislodged
Light frequency > threshold: Electrons are dislodged and gain kinetic energy
What is the threshold frequency? correct answers The lowest possible frequency that will eject electrons from a metal's surface in the photoelectric effect
How do frequency and intensity affect light as a wave and light as a particle? correct answers LIGHT AS A WAVE - The higher the amplitude, the more energy a wave has. The higher the frequency, the more energy a wave has
LIGHT AS A PARTICLE - Affected by frequency
ONLY affected by intensity if a photon reaches the threshold frequency.
INCREASE IN INTENSITY = INCREASE IN # OF PHOTONS = MORE ELECTRONS DISLODGED
Label the Electromagnetic Spectrum from largest wavelengths to smallest wavelengths correct answers Radio > Microwave > Infrared > Visible > Ultraviolet > X-Ray > Gamma Rays
Small wavelengths have [BLANK] frequencies/energies
Large wavelengths have [BLANK] frequencies/energies correct answers Small - High frequency/energy
Large - Low frequency/energy
Label the Visible Light spectrum from larges wavelengths to smallest correct answers Red (700nm) > Orange > Yellow > Green > Blue > Violet (400nm)
What is Planck's equation? correct answers E(photon) = hv
E = Energy of a SINGLE photon
h = Planck's constant (6.626E-34 Jxs)
v = frequency (Hertz or s^-1) [Show Less]