Class Notes Exam 1 - Week1 15:00 Angstrom10^10meters...

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Week 1 15:00 Definite chemical composition and an ordered structure Angstrom- 10^-10 meters start with 2D and layer to get 3D to save space start from a node and go to next node and next node ect. until it  returns to original node parallelogram: a not equal to b,angle not equal to 90 rectangle: a not equal to b, angle equal to 90 diamond: a1=a2, angle not equal to 90, 60, or 120 rhombus: a1=a2, angle = 60 or 120 distance always to front is a length                                   right is b length                                   up is c length if going in the opposite direction it is -a,-b,-c gamma angle b/w a and b alpha angle b/w b and c beta angle b/w a and c 6 groups- KNOW THESE!! cubic- a=b=c, all angles=90 tetragonal- a=b not=c, all angles=90 orthorhombic- a not=b not=c, all angles=90 monoclinic- a not=b not= c, alpha=gamma=90, beta>90 triclinic- a not= b not=c, no angle = to 90 (parallelogram)  hexagonal- a=b not=c, angles= 60 or 120
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