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Chem 101 Exam #1

QuestionAnswer
visible light spectrum 700 (red) - 400 (violet) nm
relationship between frequency & wavelength inversely proportional; LOWest frequency= LONGest wavelength
wavelength lambda
frequency nu
c 3.00E8 m
h (planck's constant) 6.626E-34 j*s
what is nu equal? c/ lambda
deBroglie's equation lambda=h / mass* velocity
paramagnetic needs a "pair"or "pairs", unfilled shells
diamagnetic filled shells, dia=2 electrons
rydberg equation deals with what? energy levels with hydrogen
rydberg equation? E= -Rhc/n^2
R 1.0974E7
electron is described as??? a standing wave
aufbau priciple As protons are added one by one to the nucleus to build up the elements, electrons are similarly added to these hydrogen-like orbitals
electron affinity amount of energy released when an electron is added to a neutral atom
ionization energy minimum amount of energy REQ to remove the most loosely bound electron to form a cation
atomic radii distance between two nuclei of two atoms
lattice energy k = (Q1Q2/r)
k 8.99E9
what makes something classify as ionic? if it conducts electric current when melted
enthalpy equation bonds broken minus bonds made
electronegativity measure of the attraction of an atom for it's electrons; how tight the nucleus holds onto it's valence electrons
long wavelength low frequency, low transition energy
short wavelength high frequency, high transition energy
bond order (#bonds/# resonance structures)
formal charge (atom # - lone electrons) - # of bonds
highest frequency highest energy
electrons have wave properties through which observation???? diffraction: light is scattered from a regular array of points and lines; destructive and constructive interference
emission spectrum (in order of longest wavelength to shortest) radio, micro, infra red, visible light, UV, x-ray, gamma ray Raul's Mother Is Visiting Uncle Xavier's Garden
periodic table trends (from fluorine to francium) electron affinity= decreases, ionization energy= decreases, atomic radii= increases
electron screening the effect of lower shell electrons have have upon higher energy electrons. The higher electron "sees" the nucleus through a fog of lower level electrons (aka they do not feel the charge of the nucleus). this is why 4s electrons < 3d electrons
diffraction pattern the pattern that is produced that is produced from diffracted light; bright spots and dark spots on a photographic plate
Thomson model plum pudding model; cathode ray tube experiment= discovered electrons
millikan experiment oil drop experiment; determined charge of an electron & mass (9.11E-31 kg)
rutherford experiment gold foil; determined that there was a nucleus in an atom and disproved JJ Thomson model
henri bequecrel experiment discovered radioactivity; rock in a drawer
john dalton introduced atomic theory; law of multiple proportions= when two elements combine to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.
antoine lavoisier named carbon, oxygen, and hydrogen; discovered oxygen's combustion; discovered sulfur; law of conservation of mass=mass is conserved in chemical reactions
joseph proust law of definite proportion= a given compound always contains the same proportion of elements by mass
Joseph Gay-Lussac performed experiments in which he measured (under the same conditions of temperature and pressure) the volumes of gases that reacted with each other
avogadro proposing that at the same temperature and pressure, equal volumes of different gases contain the same number of particles.
Created by: accident_prone