Quantum Numbers, Electron Configuration, Orbital Diagrams
The principal quantum number indicates the relative ______ & ______ of the orbital.
Size, Energy
A professional painter can paint 20.0 yd2 in 25.5 minutes. How many hours will it take the painter to paint 15 walls that are 12.0 ft by 12.0 ft at the same rate? Give your answer to 3 significant figures.
1yd = 3ft
5.10 hours
In the photoelectric effect, what effect does increasing the intensity of light have on the experiment?
Increasing the intensity of light increases the number of electrons that are ejected per second
If energy is transferred from the surroundings to the system, the change in energy is positive for the __________ and negative for the __________.
System, Surroundings
Which of the following are true?
A. The law of definite proportions applies to samples of two different compounds composed of the same elements
B. "Nitrogen dioxide always has a mass ratio of 2.28 g O to 1 g N" Demonstrates the law of definite proportions
C. When 46g of a certain compound decomposes, it produces 14 g nitrogen and 32 g oxygen; the law of multiple proportions allows you to predict how much nitrogen and oxygen would be produced from the decomposition of a 156 g sample.
D. The law of multiple proportions applies to different samples of the same compound; for example, two different samples of C6H6O6
E. If 22 kg of gasoline reacts with 85 kg of oxygen gas, then the total mass of carbon dioxide and water vapor produced from the reaction must be 107kg; this demonstrates the law of conservation of mass.
F. The law of conservation of mass does not apply to combustion reactions, like burning a log in a campfire, because the mass of ashes remaining does not equal the mass of the log that was burned
B and E
The magnetic quantum number (m) describes the _____ of the orbital.
Orientation
(9.95+0.05)/2.0000E3
0.005000 or 5.000E-3 (4 Sig Figs)
When two identical waves that are in phase combine, they undergo __________ interference; when two identical waves that are out of phase combine, they undergo __________ interference.
Constructive, Destructive
The Law of _____________ applies when comparing a 15.0 g sample of MgCl2 to a 42.0 g sample of MgCl2
Definite Proportions
An element has three naturally occurring isotopes. The first isotope has a mass of 38.9637 and abundance of 93.2581%. The second isotope has a mass of 39.9640 and abundance of 0.0117%. The third isotope has a mass of 40.9618. Find the atomic mass of the element, giving your answer to 4 significant figures. Identify the element.
39.10, K
Write the expanded and short-hand form of the ground-state electron configuration for cadmium, Cd.
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10
[Kr] 5s2 4d10
A girl sells lemonade at a lemonade stand. In 24.0 minutes, she sells an average of 5 glasses of lemonade. She wants to make an average of $15.0/hr of profit. If each glass of lemonade costs her $0.85 for supplies, how much in $ does she need to charge for one glass of lemonade? Give your answer to the nearest hundredth (two to the right of the decimal place).
$2.05/Glass
When an electron jumps from a _______ to a _______ energy level, it releases a photon with an energy equal to the difference between the two energy levels.
Lower, Higher
Atoms of the same element all have the same number of __________; this number is called the __________ number.
Protons, Atomic
A 20.0 g sample of an element contains 3.015E23 atoms. Give the symbol for the element.
Ar
According to the __________ ___________, we can build up to the electron configuration for a multi-electron atom by adding electrons into the __________ energy available orbitals.
the Aufbau Principle, Lowest
65.70/(0.755+3.145*2.19)
8.59 (3 Sig Figs)
According to Heisenberg's Uncertainty Principle, the more certain you know the __________ of the electron, the less certain you can know its __________.
Position, Velocity
__________’s cathode ray experiments showed the existence of __________ and determined their charge-to-mass ratio.
J.J. Thomson, Electrons
______'s oil drop experiment determined the fundamental charge of the electron
Robert Millikan
Draw the orbital diagram for Ti. How many unpaired electrons are there?
2
On account of the high heat and low humidity in the summer in Death Valley, a visitor requires about one quart of water for every two miles traveled on foot. Calculate the approximate number of liters required for a person to walk 18.0 kilometers in Death Valley. Give your answer in 3 sig figs.
1 mile = 5280 ft 1ft = 0.3048 m
1 gallon = 4 quarts 3.7854 L = 1 gallon
5.29 L
An electron has a mass of 9.109E-28 g and a deBroglie wavelength of 5.39 nm. Calculate its velocity in miles/hour. Give your answer using 3 sig figs.
1mile = 1.6093 km
3.02E5 mph
__________ properties do depend on the amount of substance; an example would be __________.
Extensive; Examples can include mass, volume, surface area, number of moles, etc.
What's 2+2?
4