Final Exam Flashcards
Atomic number
The number of protons in an atom
Mass number
Mass of all protons + neutrons in an atom
What property is the energy carried by photons most directly associated with?
Frequency
Definition of a heterogeneous mixture
A mixture with non-uniform composition
Definition of a homogeneous mixture
A mixture with uniform composition
Nano
10^9
Micro
10^6
Mega
10^-6
What is an orbital node?
An area around the nucleus where the probability of finding an electron is greater than zero
What is a net ionic equation?
An equation including only the molecules that are actively involved in a reaction, that are changed by the reaction. Excludes spectator ions
What is entropy a measure of?
How energy is distributed in a system. Units: J/K
How do you find velocity if given wavelength and frequency?
velocity = (wavelength)(frequency)
How do you calculate the energy of electrons in a hydrogen atom?
E = -(Rydberg energy)/(n^2)
Rydberg energy is given on the sheet, n is the principle electron orbital quantum number (1 for hydrogen)
How do you calculate the change in energy caused by an electron transitioning across different electron shells/levels (Bohr model rings)?
delta E = -(Rydberg energy)(Z/n - Z/n)
This one is given on the sheet
Z = atomic number
n = principle electron orbital quantum number
How do you calculate the specific heat of something if given the mass and temperature change from a calorimetric experiment?
qA = -qB
(C)(m)(Tf - Ti) = - (C)(m)(Tf - Ti)
The left and right sides of the equation describe two different substances, the ones the heat was transferred to in the experiment. Each has a different C (specific heat capacity)
m is mass, T is temp
How do you calculate the work done on a system?
w = - (P)(delta V)
w = delta E - delta H