Periodic Trends
Orbitals
General Equilibrium
Titrations
Miscellaneous Trivia
100
Given the list of elements B, Al, Ga, and In, which element has the most metallic character?
In
100
Without using quantum numbers, describe the differences between the shells, subshells, and orbitals of an atom.
shell: set of orbitals in the same energy level
subshell: set of orbitals in the same energy level and same shape (s, p, d, or f)
orbital: can hold up to 2 electrons
100
An equilibrium that strongly favors products has a K value
greater than 1
100
What is the difference between the endpoint and the equivalence point in a titration?
Endpoint: the point where the indicator changes color
Equivalence point: the point where [H+] = [OH-]
100
What is the boiling point of water in Kelvin?
373 K
200
Chlorine is much more apt to exist as a negative ion than Sodium. This is because
Chlorine has a greater electronegativity than Sodium
200
What does the quantum number ms represent?
ms determines the spin of an electron
200
If the reaction quotient Q has a larger value than the related equilibrium constant, K,
then the reaction is not at equilibrium and will make more reactants at the expense of products.
200
If it takes 54 mL of 0.1 M NaOH to neutralize 125 mL of an HCl solution, what is the concentration of the HCl?
4.32 x 10-2 M HCl
200
Are organic compounds water-soluble?
No
300
Why is the second ionization energy higher than the first ionization energy (in general)?
An element’s second ionization energy is the energy required to remove the outermost, or least bound, electron from a 1+ ion of the element. Because positive charge binds electrons more strongly, the second ionization energy of an element is always higher than the first.
300
What is the range of allowed values for the quantum number n?
non-zero integer
300
Increasing the temperature of an exothermic reaction results in
more reactants and fewer products.
300
How many moles of HCl are needed to neutralize 0.10 L of 2.0 M NaOH?
0.20 mol HCl
300
What is the pH of pure water at 100 degrees Celsius (in comparison to STP)?
6.14 (lower)
400
The atomic radius of main-group elements generally increases down a group because
Both the effective nuclear charge and principal quantum number of the valence orbitals increases
400
Can a 2d orbital exist?
No, because the angular moment is too high for the given quantum levels. n = principal quantum number and l cannot exceed n - 1.
400
The equilibrium constant for the reaction
2 SO2 (g) + O2 (g) ↔ 2 SO3 (g)
would be
K = [SO3]2/[SO2]2[O2]
400
lf it takes 15.0 mL of 0.40 M NaOH to neutralize 5.0 mL of HCl, what is the molar concentration of the HCl solution?
1.2 M
400
Which element is commonly used in catalytic converters due to its properties as a reducing agent?
Platinum
500
Why do transition metals have multiple oxidation states?
Transition metals have partially filled d-orbitals (one or more unpaired d-orbital electrons)
500
Identify the subshell in which the electron with the following quantum numbers is found: n = 3, l = 2
3d
500
The Haber process is a method to produce ammonia from hydrogen and nitrogen gasses. The reaction is
N2 (g) + 3 H2 (g) ↔ 2 NH3 (g).
If hydrogen gas is added after the reaction has reached equilibrium, the reaction will
shift to the right to produce more product
500
A 75.0mL sample of 0.100M sodium hydroxide is titrated with 0.150M hydrochloric acid. Find the pH of the solution after adding 45.0mL of hydrochloric acid.
11.8
500
On the periodic table, Francium is named for the country of France; less obviously, what metallic element gets its name from the old Latin name for what is now France?
Gallium