Elements
Which of the following elements is a metalloid?
O, Cl, Xe, Mg, Sr, Si
Silicon; Si
Lithium metal (and all group 1 metals) spontaneously combust when exposed to open air. Is this a chemical for physical change?
Chemical
What is the mass of a 1.75L sample of a liquid that has a density of 0.921 g/mL?
1.61 kg
What does each quantum number tell us?
n: Energy level/shell
l: sub shell
ml: orientation
ms: spin
Energy can only be emitted or absorbed in discrete quantities. This means that energy is _______.
quantized
What is the symbol for Fluorine and what type of element is it (metal, nonmetal, metalloid, etc.)?
Fl, nonmetal
Nitrogen boils at -195.8 Celsius (77.2 Kelvin). Is this a chemical or physical property?
Physical
How many atoms are in 58.4g of Bi? (mm=208.98 g/mol)
1.68 x 1023 atoms
Is the following set of quantum numbers allowed? Why or why not?
n = 2; l = 2; ml = 1; ms = -1/2
No, l must be less than n (lmax = n-1)
Energy is inversely proportional to wavelength
E = hc/wavelength
E = hv
They have a different number of neutrons
Which of the following properties are extensive?
Density, mass, freezing point, volume
Mass and Volume
How many minutes does it take light from the sun to reach Earth? (The distance from the sun to Earth is 9.3 x 107 mi; the speed of light is 3.00 x 108 m/s; 1mi = 1.61 km)
8.32 minutes
What does it mean for energy levels to be degenerate?
They have the same energy
You have a purple light with a wavelength of 428nm. What is this light's frequency?
7.00 x 1014 s-1
7.00 x 1014 Hz
The isotope of uranium used to produce nuclear energy and nuclear weapons in Uranium-235 (235U). How many neutrons does this isotope have?
143 neutrons
Which of the following properties are intensive?
Density, mass, melting point, length
Density and Melting Point
An IV is set up to deliver 3.0 mg/min of fluid to a patient. What is the flow rate in ng/day?
4.32 x 109 ng/day
Explain the importance of Rutherford's gold foil experiment.
The experiment led to the discovery of the atomic nucleus (the nuclear model of the atom)
Calculate the De Broglie wavelength, in nm, of a neutron that has a velocity of 200 cm/s. (mass of a neutron = 1.675 x 10-27 kg)
198 nm
Lithium has 2 naturally occurring isotopes, 6Li and 7Li. 6Li has an isotopic mass of 6.015123 amu with an abundance percentage of 7.47%. Lithium has an atomic mass of 6.9412 amu. Calculate the isotopic mass, in amu, of 7Li.
7.01596 amu
A 7.0g sample of Iron (55.845 g/mol) boils at 2,861 Celsius. At what temperature would a 70.0g sample melt?
2,861 Celsius
A gold bar weighs 17.25g. The listed price of gold is $1920.3/oz. How much is the gold bar worth? (1 oz = 28.35 g)
$1168.4
What does the Heisenberg Uncertainty Principle tell us?
If a 100 Watt light bulb radiates energy at a rate of 100 J/s, and all of the light emitted has a wavelength of 525 nm, how many photons are emitted per second?
2.64 x 1020 photons/s