Term
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Definition
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Term
| molar mass (molecular weight) |
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Definition
| the mass in grams of one mole of a substance |
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Term
| mass fraction of a given element |
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Definition
mass of the element in one mole of compound
mass of one mole of the compound
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Term
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Definition
| tells the relative # of atoms of each element it contains. the simplest whole # ratio of atoms in a compound |
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Term
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Definition
| the exact formula of a molecule, giving the types of atoms and the # of each type |
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Term
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Definition
molecular weight
empirical formula weight |
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Term
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Definition
| to arrive at the nearest whole number, the number must be within 0.2 to round up or down |
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Term
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Definition
| the ratio of moles of one substance to moles of another substance in a balanced equation |
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Term
| stoichiometric quantities |
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Definition
| the exact amount of reactants that is used so that all of the reactants will run out (used up) at the same time |
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Term
| limiting reactant (reagent) |
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Definition
| the reactant that is consumed first and limits the amounts of product formed |
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Term
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Definition
| the amount of a product formed when the limiting reagent is completely consumed |
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Term
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Definition
| the amount of product actually obtained |
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Term
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Definition
| actual yield/theoretical yield x 100 |
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Term
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Definition
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Term
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Definition
| a spectrum that exhibits all the wavelenths of visible light (white light pass through a prism) |
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Term
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Definition
| a spectrum that contains certain specific wavelengths which are characteristic of a substance emitting those wavelengths |
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Term
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Definition
| the distance between two consecutive peaks or troughs in a wave |
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Term
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Definition
| the given number of waves (cycles) per second that pass through a given point in space |
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Term
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Definition
| indicates how fast a given peak moves through space |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| have mass and position in space specified |
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Term
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Definition
| massless and delocalized, position in space could not be specified |
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Term
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Definition
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Term
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Definition
| the transfer of energy from the photon to the electron |
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Term
| Conclusions from Plank & Einstein |
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Definition
1. Energy is quantized. It can only occur in discrete units called quanta.
2. Electromagnetic radiation, which was previously thought to exhibit only wave properties, seems to show certain characteristics of particulate matter as well. This phenomenon is sometimes referred to as the dual nature of light |
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Term
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Definition
| investigated the dual nature of matter and discovered an equation which allows us to calculate the wavelength of a particle |
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Term
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Definition
| the scattering of light from a regular array of points or lines, producing contructive and destructive interference |
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Term
| CJ Davisson and L.H. Germer |
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Definition
| directed a beam of electrons at a Ni crystal, and observed a diffraction pattern similar to x-ray defraction |
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Term
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Definition
| short wavelength of light |
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Term
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Definition
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Term
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Definition
| only certain values are allowed for energy levels |
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Term
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Definition
| developed quantum model for the H atom. proposed that the electron in a H atom moves around the nucleus only in certain allowed circular orbits. calculated the radii for these allowed orbits by knowing that particles in motion tend to move in a straight line and can travel in a circle only by application of a force toward the center of the circle |
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Term
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Definition
molar mass
empirical formula mass |
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Term
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Definition
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Term
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Definition
nhv
h = planck's constant
v = frequency of electromagnetic radiation |
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Term
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Definition
hv
or
hc
___________
wavelength |
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Term
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Definition
E/c2
e = energy
c = speed of light
(hc/wavelength)/c2
h/(wavelength*c) |
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Term
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Definition
| m = h/(wavelength*velocity) |
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Term
Bohr's equation
(change in energy of an electron when it changes orbits) |
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Definition
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Term
| change in energy of an atom |
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Definition
| energy of final state - energy of initial state |
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Term
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Definition
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