CHE 332 EXAM 1 Study Guide

CHE 332 EXAM 1 - ter shells(valence toms centers 55<0.225 nature and have noble gas configuration rgy levels Phase-chemically homogenous physically

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
tility decreases and cood # controlled by BOND TYPE not by size atoms centers n ergy levels free electrons) ed in bonding (no free electrons) er of bonding orbitals, shape of orbitals electron filled shells of one atom filled by electrons covalent bonding ter shells (valence) nature and have noble gas configuration y/radius ratio mpounds not molecules /repulsion determine bond strength harged spheres) p. and attr. Same in all directions) mmetry in all directions 155<0.225 225<0.414 414<0.732 732<1.00 00< Phase-chemically homogenous, physically distinct unit of matter that is physically inseperable Material-solid element or compound that doesn’t undergo a chemical change(not drugs,chemicals,dyes) “needs” of a metal dictate its properties Visible spectrum- 3500-7500 Angstroms Eyes sensitive to green (5400 A) Incandescent light bulb-Edison 1890 (contain W,Pb,Al,Epoxy, sealing glass, and epoxy-a polymer) Helium has the highest heat capacity of any gas Just focusing on solid metals 35 Important: Light Metals: high strength to weight property ratios *Mg, Ti, Al, Be, Li* Rare Metals: Do not oxidize, high melting points *Sc, Y,Ta, Ru, Rd, Re, Os, Ir, Cd, In, Tl* Steel Additives: Iron + carbon = steel *V, Cr, Mn, Co, Ni* Ferrous Alloys: Fe, not used in pure form because oxidation corrosion Pure Cu: Used in electrical applications, bronzes, and brasses Pure Zn: HCP structure 74% efficient-protects against corrosion Refractory Elements: Nb aka columbium-extremely high melting points *Nb, Mo, W, Ta* Precious Metals: Catalysts, electro-plating *Pd, Pt, Ag, Au* Corrosion Resistance: food packaging, steel coated with tin Joints: Pb is ductile and malleable (Densiest of all elements except Uranium) Chemical Bonding: Outermost electrons or valence electrons -interactions w/ other valence electron from other elements 2. Clouds of negative matter (circular of polarized) 3. Electrons (have negative charge with little mass) Nature of electrons: Particle Properties-Bohr-Rutherford Theory-1913 Wave properties-Debrolie Schrodinger (1924,1926)-solutions to wave equations (quantum mechanics)-harmonic oscillations with modes being the solutions of allowed energies (Q#) Q#’s = n,l,m l ,m s N= primary/principle quantum number (n=1,2,3…) L= shape of orbitals ((s, L=0), (p L=1), (d L=2), (f L=3) M l = angular momentum;# energy states per sub orbital M s =spin up or down “Paulie Exclusion Principle” – 1 electron per quantum #, No 2 electrons can occupy the same energy level; including spin::::: EX: Fe: 1s^2,2s^2,2p^6,3s^2,3p^6,3d^6,4s^2
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/21/2011 for the course CHE 332 taught by Professor Gregory during the Spring '11 term at Rhode Island.

Page1 / 3

CHE 332 EXAM 1 - ter shells(valence toms centers 55<0.225 nature and have noble gas configuration rgy levels Phase-chemically homogenous physically

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online