Physics 1
what are the units of ∆S?
J/mol*K
what does diamagnetic mean?
atoms that have no unpaired electrons and have no net magnetic field
what does the Heisenberg uncertainty principle state?
impossible to know both location and momemtum
compounds sometimes have resonant forms. Are these structures in equilibrium with each other?
no, rather the true form of the molecule is a hybrid of the resonance structures
but, certain forms can be favored over others
the true structure is somewhere in between the resonance structures
there are raccoons living in the dumpster behind my building. I am curious to know more about their social interactions. I observe them, without interacting, for a few weeks to record their behavior. What kind of study is this?
ethnographic
what is an adiabatic process?
no heat exchanged
what is absolute (hydrostatic) pressure?
the total pressure exerted on an object that is submerged in fluid (liquid or gas)
hydrostatics is the study of fluids at rest
what is the saturation point for a solution?
how is a pi bond formed?
from the overlap of two p orbitals
in high school, they gave a very long multiple choice "test" asking me about drug and alcohol use, sexual behavior, mental illness etc.
what kind of study is this?
survey
cross-sectional
what is the formula for elastic potential energy?
U = 1/2 k x^2
k = spring constant
daily double
what is specific gravity? what are the units?
unitless
the density as compared to the density of water. will determine if something will sink or float
what type of mixture is milk?
colloid = a type heterogeneous mixture, A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance.
daily double
why do proteins have limited rotation around their backbone?
there is resonance in peptide bonds - it exhibits partial double bond character and therefore has limited rotation
I'm curious to know any long-term outcomes of COVID-19 patients. I pick a group of 100 patients who had COVID and follow them for 30 years. What kind of study is this?
cohort
(prospective)
what is the equivalent of a watt as expressed in kg, m and seconds
kg*m^2/s^3
If a block floats in water with only half of its volume submerged in the water, how does the density of the block relate to the density of the water?
half as dense
• When an object is placed in a fluid, it will sink into the fluid only to the point at which the volume of displaced fluid exerts a force that is equal to the weight of the object
I have a solution of table salt (NaCl) in water. I attempt to now dissolve some KCl into this solution. How will the solubility of NaCl be affected?
daily double
how do you separate the two enantiomers in a racemic mixture?
react the two enantiomers with another compound that only has one enantiomer.
this will produce two diastereomers with different physical properties.
we will be able to exploit these differences to separate the compounds - via crystallization, filtration, distillation etc.
once separated, we can regenerate the original enantiomers
I suspect that the drinking water in my neighborhood may be tampered with. I believe it causes leukemia. I find 30 people who were recently diagnosed with leukemia in my area and determine if they drink the tap water. what kind of study is this?
case-control study
a vector length 25 is at angle 13 degrees. what are the lengths of x and y components of the vector?
x = Bcostheta = 25 cos 13 = 24.36
y = Bsintheta = 25 sin 13 = 5.62
what is the equation for the doppler effect?
f' = f (v +/- v detector) / (v +/- v source)
f = frequency
Zn(s)|Zn2+(aq)||Cu2+ (aq)| Cu(s)
give the half reactions and designate whether they occur at the anode or cathode
anode: Zn(s) --> Zn2+ + 2e- (oxidation)
cathode: Cu2+ + 2e- --> Cu(s) (reduction)
what is an aprotic solvent?
a solvent that cannot act as a H-bond donor
eg. acetone
I suspect that a particular face cream causes pimples on my nose. I recruit participants to help me investigate. I use two groups. One group gets a fake face cream and one group gets the real one. No participant knows which they are receiving, nor do the research staff who provide them with the cream. I randomly assign participants to one of these two groups. What kind of study is this?
randomized control trial