Chem final
Consider a 0.50M solution of each of the following salts. Which will have the lowest freezing point?
Cr(NO3)3
At room temperature and 1 atm pressure the molecules are farthest apart in
Fluorine
What diatomic molecule did you calculate the bond order of it in the previous question?
He2
Which increases when a gas is heated at constant volume? I. Presssure II. Kinetic energy of molecule III. Attractive forces between molecules
I and II
Which factors affects the vapor pressure of a liquid I. Intermolecular forces of attraction within the liquid II. The volume and or surface area of liquid present III. the temperature of the liquid
I and III only
Which pairs of substances will dissolve in each other I. CH3OH II. C6H6 III. CH3CH3
II and III only
Which pair of ions would form the ionic substance with the highest lattice energy?
Li+ and O2-
Which of the following is NOT a characteristic of an ionic bond?
Low melting point
the rate law of a certain reaction rate = k[X][Y]. the units of k, with time measured in seconds, is
M-1s-1
Which compound has the shortest bond length?
N2
Which of the following cases has the highest average molecular speed at 298K?
Ne
Which pair of elements listed below could be central atoms that can exceed an octet of valence electrons?
Sb and P
A change to what variable leads to the most substantial increase or decrease in average kinetic energy in Kinetic Molecular Theory
Temperature
Which statement is true of a measured pressure of nitrogen gas collected over water at a constant temperature?
The total measured pressure is greater than the pressure of nitrogen
Boyle's Law shows the relationship between which of the following variables?
Volume and Pressure
which of the following ways is the best indicator for determining polarity?
all of the above
for molecules with trigonal bipyramidal electro domain geometry, which of the following is not a correct choice for its potential molecular geometry?
bent
the slowest step of a reaction mechanism is called the
elementary step
What influence does the double bond have on the Cl-C-Cl bond when compared to the idea bond angle of 120 degrees?
it becomes less than 120 degrees
According to valence bond theory, covalent bonds form due to
overlapping of orbitals
The rate expression for a third-order reaction could be:
rate= k[X]2[Y]
How do you determine the total amount of electron domains in a molecule?
the number of bonding domains + lone pairs
For a first-order reaction of half-life 75 minutes, what is the rate constant in min-1
(0.693)/75
What is the formal charge for sulfur?
+1
What ion would phosphorus typically form?
-3
what is the bond order of a molecule the has 2 bonding electrons and 2 nonbonding electrons?
0
Enough water is added to 11.5 grams of ethanol to make 2.00 liters of solution. What is the molarity of ethanol?
0.125M
How many nonbonding electron pairs does the molecule PCl3 have?
1
What is the bond angle present in CCl4?
109.5
What is the C-C-O bond angle in ethyl acetate?
120 degrees
Draw all resonance structures for ozone. How many are there?
2
The Lewis structure for SeS2 has a total of how many bonds and how many lone pairs?
3 bonds and 6 lone pairs
Draw the Lewis Dot Structure for carbon. How many dots does it have?
4
What is the mass percent of methanol in a solution prepared by adding 32.0g of methanol to 18.0 grams of water?
64.0%
If a bond is ionic, you would expect the difference in electronegativity to be
>2.0
A gas is most likely to behave as an ideal gas in which instance
At room temperature and pressure because intermolecular interactions are minimized and the particles are relatively far apart
Which pair of atoms should form the most polar bond?
B and F
Which compound is most likely to form intermolecular hydrogen bonds?
C2H5OH (hydrogen + FON)
Which molecule has the weakest bond?
Cl2