Photons
T/F:
One photon of ultraviolet radiation has more energy than one photon of gamma rays
False: less
The Law of ____________________________________ applies when comparing a 15.0 g sample of MgCl2 to a 42.0 g sample of MgCl2
Law of Definite Proportions
In ______________________________________________________, the particles are evenly distributed; in ______________________________________________________, the particles are not evenly distributed.
homogeneous mixtures, heterogeneous mixtures
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
__________________________’s gold foil experiment disproved the _______________________ model; it showed that atoms contain a very dense ____________________________ holding most of the mass of the atom, but occupying very little of its volume
Rutherford, plum pudding, nucleus
Atoms of the same element all have the same number of _____________________________; this number is called the _____________________ number
protons, atomic
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
As frequency increases, wavelength ____________________________
decreases
Classify the following as a law, theory, or observation: “When two elements (A & B) form two different compounds, the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers”
Law: brief statement that summarizes past observations and predicts future ones
If hydrogen gas combines with oxygen gas to produce H2O gas, completely reacting 4.03 g hydrogen gas with 32.0 g oxygen gas should produce ______________ g of H2O gas
36.03
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
In the Bohr model of the atom, the energy of an electron is ______________________________, which means it can only have certain values of energy
quantized
A scale at the supermarket has markings every 0.1 lb. Which of the following reports a measurement of the weight of apples on this scale to the correct number of significant figures?
a. 15 lb b. 15.4 lb c. 15.41 lb d. 15.412 lb
c. 15.41
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?
Calculate the de Broglie wavelength in pm of an argon gas atom (Ar) traveling 145 m/s. Give your answer to 3 significant figures.
69.2pm
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
Complete the following calculation to the correct number of significant figures assuming all numbers are measurements:
10.00 – 9E–2 – 9.21
0.70
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?