Scientific Measurements
what is the value of kilo
103
What is the mass of 4.5 x 1034 atoms of Carbon
(4.5x1034)/(6.02x1023)= (7.47x1010)x(12.011)= 9.00 x 1011
What equation relates speed of light, wavelength, and frequency?
c = λν
What is the speed of light?
3.00 x 108 m/s
What are the steps for converting grams to atoms?
First divide mass by molar mass and then multiply by Avagadro's number
true or false:
a conversion factor is a ratio
true
How many atoms are in 1 gram of Carbon
5. x 1022
1gx(1 mol/12.011g)= 0.0832mol x 6.02x1023=
5. x 1022
what is the photoelectric effect equation?
hv = Ek + W
Ek = is the kinetic energy of the
ejected electron
W= the binding energy of the electron
Use the de Broglie relationship to determine the wavelength of an 85-kg person skiing at 50 km/hr
5.6 x 10-37 m
describe the photoelectric effect?
when light strikes the surface of a metal, electrons can be ejected. but each metal has a minimum amount of energy for this to happen
Exactly 1 m3 is equal to how many Liters?
1000 L
The diameter of an atom is approximately 1 × 10-8 cm. What is this diameter when expressed in
nanometers?
1 × 10 3 nm
The retina of a human eye can detect incident radiant energy when it is at least 4.0 x 10-17 J. For light of 585 nm wavelength, how many photons does this correspond to?
117.7 photons
Calculate the energy (KJ/ mol) of photons of blue light with a wavelength of 469 nm
255 kJ/ mol
Silver has two stable isotopes with masses of 106.90509 amu and 108.9047 amu. The average atomic mass of silver is 107.8682. amu What is the relative abundance of the lighter of the two isotopes?
0.518
determine the number of moles of Na in
15.75 g of sodium
0.6851 mol Na
One type of laser used in the treatment of vascular skin lesions is a neodymium-doped yttrium aluminum garnet or Nd:Y A G laser. The wavelength
commonly used in these treatments is 532 nm. What is the frequency of this radiation?
5.64 x 1014 s-1
An aluminum can beverage contains 12.0 fluid ounces of liquid. Express this volume in microliters. (1 fl oz = 29.6 mL)
3.55 x 105 microliters
The kinetic energy of a mole of electrons ejected off a metal surface is 117 kJ/mol. A wavelength of 220 nm will eject an electron from the surface of a metal. What is the wavelength of the incident light (the light initially hitting the metal)?
181 nm
Radio waves travel at the speed of light, which is 3.00 × 10 8 m/s. How many kilometers will radio messages to outer space travel in exactly one year?
9.46 × 1012 km