Most missed exam review Flashcards
What is the molecular formula for Butane?
C4H10
What is the formula to find the ane(example butane, ethane, propane)?
CnH2n+2
A hypothetical element has two isotopes: 52X and 56X. The average atomic mass of the element is 54.6 amu. Which signal intensity is larger and which is smaller?
the signal intensity for 52X is larger then 56 signal intensity
How many m are in a km?
1000m
How many milimeters(ml) are in a meter(m)
1000mm
How to go from nm to m?
times it by 10^-9
What is the units of energy for light?
J/Photon
How to go from J/Photon to kJ/mol?
1Kj/1000J x 6.022 x 10^23photons/1mol
how many J is in 1 kJ?
1000J
How many photons is in one mol?
6.022 x 10^23 photons
Bond enthalpies are always____becasue energy must be____to break a chemical bond
endothermic or positive , absorbed
A light source hits the surface of platinum metal and no electrons are emitted. What change should be made to the light source to eject electrons?
Decrease the wavelength of the light source
Given the following 1.00 M aqueous solutions, identify the least conductive and most conductive solutions:
CH3OH
NaOH
CH3COOH
NaOH strong electrolyte
CH3OH
CH3COOH weak electrolyte
Most conductive:NaOH
Least Conductive:CH3COOH
How do you know if there is a radial node?
there will be more than one hump more than one node if there is only one large curve it isn’t a radial node?
If there is 0 radial nodes what is the orbital being shown?
1s
Which change leads to an increase in potential energy of the system?
Two negative charges are moved closer together.
Two positive charges are moved farther apart.
A negative charge and a positive charge are moved closer together.
Two negative charges are moved closer together.
If the ∆H value is positive is it endothermic or exothermic?
endothermic
The transition of an electron from the n = 3 state to the n = 4 state requires absorption of a photon.
True or False
True
What does ∆H= to ?
qrxn
What does qrxn=?
-qsoln
If you are trying to find the qrxn how do you go from qsolution to qrxn?
-qsol=qrxn you make it positive
How many mg are in g?
1000mg to 1g
Constructive combination of two 1s atomic orbitals leads to the bonding MO
false
AB3 with 2 lone pairs
polar
The lattice energy for KBr is +671 kJ/mol. Which reaction below represents the lattice energy for KBr?
KBr(s) → K(s) + ½ Br2(l)
KBr(s) → K+(g) + Br–(g)
KBr(s) → K+(s) + ½ Br2–(g)
K(s) + ½ Br2(l) → KBr(s)
KBr(s) → K+(g) + Br–(g)
Overlap of two p-orbitals oriented perpendicular to the bonding axis
sigma or pi
pi
Overlap of one s-orbital with one p-orbital.
sigma or pi
sigma
Overlap of one s-orbital with one sp3 hybrid orbital.
sigma or pi
sigma
When given two different molecules that have the same temperature but different masses who has the bigger Kinetic Energy?
the one with the lowest mass
When given two different molecules with the same mass but different tempatures who has the bigger kinetic energy?
the one with the higher temp
