Flashcards in MCAT Chem Phys Deck (223)
Two separate containers have two different gases. If temperature is the same, what can be said about their kinetic energy?
If temperature is the same, kinetic energy of molecules in separate containers is equal.
What is the equation to measure the kinetic energy of a gas?
The equation for kinetic energy for gas and how to variables apply to each other. KE=3/2kT
What is the normality of a solution? How would you find the normality of a solution?
Normality--> number of moles of protons per liter of solution. It can be calculated by 1) molarity x number of moles or 2) molarity x number of protons in solution.
What happens to the pH/pOH of water as the temperature first increases, then decreases?
As temperature rises, the pH of water increases (becoming more basic).
Is energy created when a particle travels between two parallel plates that both exert a electrical field? Why or why not?
Particles moving perpendicular to elecrtic field lines will always produce 0J of energy.
What is the equation that allows you to find the concentration (molarity, volume, or weight) of substance needed to neutralize a solution?
When finding concentraitons of an Acid or Base in a problem, try to apply NV=NV to find volume and mass of whatever youre looking for.
What equation is used to measure the force exerted on an object in an electrical field?
F=Eq Know how to convert units correctly!!
What is the equation for Tension?
Equation for Tension is T=rFsin(θ)
What are the determining factors in bond length between atoms?
Bond length is determined by polarity of the molecule but MOSTLY by the size of the atomic radii. A very large polar molecule next to a very small molecule will have a very short bond length
What is the hybridization of NH3 and why? What are the determining factors in hybridization?
SP3 hybridization is when an atom has no π bonds and if it appears to exist in more than one state, we always say it exists in its lower state.
What are the effecting factors in bond angles? Are they a set number with no give or can they fluctuate at all?
Bond angles are generally set in stone with the exception being when large molecules--or molecules that are very electronegative--cause steric hindrance within the molecule which affects bond angles slightly.
What are secondary products of current?
Current produces heat (as well as light).
If current in a circuit changes, does anything else change?
V=IR! When Current changes, resistance does not (it's a constant) but Voltage would change.
What is the equation to measure work done by a parallel plate capacitor?
Equation to find work done by a parallel plate capacitor is: W=1/2CV^2
What is an ammeter measuring?
The ideal Ammeter has zero internal resistance. Electrons will flow through the circuit with the least amount of voltage lost (path of least resistance.
What is something all current carrying wires produce and would most accurately measure that current: 1) heat 2) Force 3)magnetic fields or 4)EMF ?
All current-carrying wires produce a magnetic field, the strength of which is in direct proportion to th strength of the current. All other answers help determine things about the current but are either not as accurate or do not provide as great of detail and magnetic field.
What are the SI units for Conductance?
Units for condeuctance or conductivity are C^2 * s /kg * m^2
How do dielectric materials affect a capacitor, its voltage, and its electric field?
Dielectric materials are placed between capacitors to decrease voltage, decrease the electric field, which leads to an INCREASE in capacitance. This can be related through the equations V=Ed and C=Q/V. As distance decreases, Voltage and electric field also decrease, which raises capacitance.
What equation is used to find the energy emitted by a photon?
The best equation to use to find the energy emitted by a photon is E=hc/λ
If you doubled the mass of a pendulum, how would that affect its final height and velocity?
Periodic motion can be described as KE=PE. Mass is independent of final height.
What is Huckel's Rule and how do you use it?
Huckel's Rule--> To find if something is arromatic, use the equation 4n+2=# of electrons and solve for n. If it's an odd number--like 1.5 or something-- its non-arromatic.
What are Geometric Isomers?
Geometric isomers--> Refers to Cis or Trans configuration (possibly E and Z).
What are sturctural isomers?
Structural Isomers--> Are the same structural formula but in a different conformation (i.e. butane vs sec-butane).
What are constitutional isomers?
Constitutioal Isomers---> The same amount of molecules but arragned in a completely different manor.
What are the differences between Amines, Enamines, and Imines?
Amine--> Just a normal NH2 group attached to something. Imine--> is a C=N carbon--nitrogen double bond. Enamine--->Is a C=C-NR bond where a nitrogen group is bonded to a doulble-bond carbons.
If I place a positive test charge into an electic field, what will happen?
When a positive charge is placed in an electric field, the field will point AWAY from the positive test charge.
How can we relate kinetic energy to temperature?
This equation shows that temperature is porpotional to kinetic energy KE=3/2*k*T
What is the Cathodes functions--and does it difer--between galvanic and electrolytic cells?
The Cathode end of the cell is ALWAYS going to reduce no matter what type of cell that it is.
What's the difference between a scalar quantity and a vector quantity?
Scalar quantities measure amounts but not directions while vectors measure both