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Bonding
Chemical Reactions
Periodic Trends and Electron Configuration
Stoichiometry
Miscellaneous
100
This bond is the strongest of the intermolecular forces- for full credit, describe why it is not the strongest of all potential forces.
What is the hydrogen bond. It is the strongest intermolecular force but all inTRAmolecular forces are much stronger.
100
CH4 + 2O2 --> CO2 + 2H2O is what kind of reaction?
Combustion
100
What is the electron configuration of Bromine?
What is [Ar] 4s2 3d10 4p5
100
Calculate the molar mass of NH3.
17.03 grams/mol
100
What organizational aspect of the periodic table can we use to predict similar properties between elements?
What is a group (or column).
200
Complete the Lewis structure of SF4.
What is (draw on board)
200
Give the balanced equation for glucose (C6H12O6) reacting with oxygen gas to produce gaseous carbon dioxide and water vapor.
C6H12O6 + 6O2 -> 6H2O
200
Certain channels in cell membranes in the body allow only certain ions into the cell- they are ion specific. Would we expect the pore for a sodium or potassium ion channel to be larger, and what charge would it be specific for?
The potassium ion is larger, as it has one more quantum level, but either way the channel would be specific for a positively charged species because electron affinity is low on the left side of the table.
200
What is the molar mass of ethanol (C2H5OH)
46.07 g/mol
200
What two things about an electron can we never know at the same time, according to modern theory?
What is momentum and location- i.e. where it is and how fast it is going.
300
This is the shape and polarity of BeH2
What is linear, nonpolar.
300
Balance the following: Ca(OH)2 + H3PO4 -> H2O + Ca3(PO4)2
3Ca(OH)2 + 2H3PO4 -> 6H2O + Ca3(PO4)2
300
Place Aluminum and its first four cations in increasing size order.
What is Al4+ < Al3+ < Al2+ < Al+ < Al?
300
Calculate the mass of 500 atoms of iron.
4.64 * 10^-20 grams.
300
Name a third period metalloid.
What is arsenic, germanium, or selenium.
400
Draw all possible resonance structures for N2O4.
What is (draw on board)
400
What kind of reaction is NaHCO3 + HCl --> NaCl + H2O + CO2?
Double displacement; the trick is that H2CO3 always decomposes to CO2 + H2O.
400
Write the equation for the electron affinity of phosphorous and write out the electron configuration of each appropriate part of the equation.
What is What is P(g) [Ne]3s2/3p3 + e- --> P-(g) [Ne]3s2/3p4
400
Who discovered the charge and mass of the electron and how?
J.J. Thomson- with the cathode ray experiment.
500
Place the following molecules in increasing order of bond length between N atoms: N2F4, N2, N2F2 and explain why.
What is N2 (triple bond) < N2F2 (double bond) < N2F4 (single bond).
500
At 1000 degrees C, ammonia gas (NH3) reacts with oxygen gas to form gaseous nitric oxide (NO) and water vapor. This reaction is the first step in the commercial production of nitric acid. Balance the equation for this reaction.
4NH3 (g) + 5O2 (g) --> 4NO (g) + 6H2O (g)
500
What is the electron configuration of copper?
What is [Ar] 3d10 4s1
500
Baking soda (NaHCO3) is often used as an antacid. It neutralizes excess hydrochloric acid secreted by the stomach: NaHCO3(s) + HCl (aq) --> NaCl (aq) + H2O(l) + CO2(aq) Milk of Magnesia, an aqueous suspension of magnesium hydroxide, can also be used: Mg(OH)2 (s) + 2HCl (aq) --> 2H2O (l) + MgCl2(aq) Which is more effective per gram as an antacid?
Mg(OH)2: 1 gram will neutralize 3.42 * 10^-2 mol HCl, while baking soda will neutralize 1.19 * 10^-2 mol HCl.
500
If I had a mole of dollars and wanted to distribute them equally to all of the roughly 7 billion people of the world, how rich would each of us be?
Very rich. This would amount to about 8.6 * 10^13 (so about 86 trillion dollars) each.