Photons
T/F:
One photon of ultraviolet radiation has more energy than one photon of gamma rays
False: less
Which law is this:
Comparing a sample of NO and a sample of NO2
Law of Multiple Proportions
T/F:
An element with the electron configuration of [Ar]4s23d6 is a main group element
False; transition element
Which are true:
a. 106 Mg = 1 g
b. 103 m = 1 km
c. 10-6 m = 1 mm
d. 10-12 g = 1 pg
b and d
What orbitals do the different values for l correspond to?
l=0 --> s
l=1 --> p
l=2 --> d
l=3 --> f
T/F:
An interference pattern demonstrates the wave nature of light; the photoelectric effect demonstrates the particle nature of light.
True
What was Rutherford's experiment and what did he discover
- Gold Foil Experiment
- Led to the nuclear model, nucleus in a cloud of electrons
What periodic table grouping reacts the most violently, especially in a substance like water?
Alkali Metals
How many cubic centimeters are there in 5.78 yd3?
1 in = 2.54 cm, 1 yard = 3 feet, 1 foot = 12 in
4.42 x 106 cm3
What is the mass in ug of 4.33E16 atoms of Cadmium (Cd)?
Answer to 3 significant figures.
8.08
Calculate the energy of a photon (in kJ/mol) that has a frequency of 9.87 × 108 MHz
394 kJ/mol
T/F:
A Law is a brief statement summarizing past observations and predicting future ones
TRUE
Which of the following is considered a halogen?
Na
I
Ca
Kr
I
A sample of a certain element has a mass of 52.0 pg and contains 1.511x1011 atoms. Give the symbol of the element.
Pb
What is the name for each principle:
a. No two electrons in an atom can have the same 4 quantum numbers
b. We can build up to the electron configuration for a multi-electron atom by adding electrons into the lowest energy available orbitals
c. degenerate orbitals fill singly first with the same spin before doubling up in an orbital
a. Pauli exclusion principle
b. Aufbau principle
c. Hund's Rule
Calculate the de Broglie wavelength in pm of a xenon gas atom (Chemical symbol: Xe) moving 498 m/s. Give your answer to 3 significant figures
6.07 pm
Solve this answer to the correct sig figs:
(4.50/1.5 𝑥 103 )+ 0.9970
1.0000
What is the symbol for a 3+ ion that has 21 electrons and 30 neutrons?
54Cr3+
You own a mini-cupcake shop and must consider your inventory. You currently have 8 50.0-lb bags of flour. Your mini-cupcake recipe requires 5.00 cups of flour and makes 173 mini-cupcakes. 1 pound of flour is 4.00 cups of flour. On average, each customer
purchases 78 mini-cupcakes.
How many customers can you serve with your current stock of flour?
Round to the nearest whole number of customers
710 people
What is the shorthanded electron configuration of Bi (atomic number 83)
[Xe]6s24f145d106p3
Bonus: How many valence electrons?
An electron in a hydrogen atom jumps from n = 6 to n = 2.
Calculate the frequency of then electron in Hz.
7.31 x 1014 Hz
Uranium has three naturally occurring isotopes: Uranium-238 (mass 238.05 amu), Uranium-235 (mass 235.04 amu), and Uranium-234 (mass 234.04 amu). Their respective fractional abundances are 99.27%, .719%, and unknown. Find the atomic mass of Uranium.
238.03 amu
Which of the following is the biggest ion?
S2-
K+
Cl-
Ca2+
S2-
You're planning on driving across country with 6 friends for spring break, to a city 989 miles away (one way). Your van averages 17.9 miles per gallon. The average cost for gasoline is $3.5 per gallon. How much will each person need to pay toward gas for the trip (both there and back), assuming the cost is evenly divided between you and your 6 friends?
Give you answer to the nearest penny (two digits to the right of the decimal point).
$55.25
Which is valid:
a. n = 4, l = 2, ml = 0, ms = +½
b. n = 1, l = 0, ml = 1, ms = +½
c. n = 3, l = 2, ml = –2, ms = –½
d. n = 0, l = 2, ml = –2, ms = –½
-a and c
Bonus points: Which is higher in energy?