Textbook Notes: Chapter 1.1, 1.2
Textbook Notes: Chapter 1.1, 1.2 Chem 1127Q
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This 1 page Class Notes was uploaded by Amanda Notetaker on Tuesday September 8, 2015. The Class Notes belongs to Chem 1127Q at University of Connecticut taught by Dr. Fatma Selampinar in Summer 2015. Since its upload, it has received 128 views. For similar materials see General Chemistry in Chemistry at University of Connecticut.
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Date Created: 09/08/15
Textbook Notes Chapter 11 12 11 Matter and Its Classifications o Matter has mass takes up space 0 solid fixed shape not fixed volume 0 liquid not fixed shape fixed volume 0 gas not fixed shape not fixed volume 0 pure substances 0 mixtures of two or more substances 0 Element cannot be broken down one pure substance 0 Separation of Mixtures o Filtration I separate heterogeneous solidliquid mixture I passed through a barrier with fine pores o Distillation I resolve a homogeneous solidliquid mixture I liquid vaporizes leaves residue of solid 0 Chromatography I exposes differences in solubility 12 Measurements 0 Factors use for dimensional analysis 0 1 mL 1 cm 3 o 1 L 1000 cm 3 o Megagram Mg metric ton o Uncertainties in Measurements Significant Figures 0 8 mL gt 8 i1 mL 0 80 mL gt 80 01mL o 800 mL gt 800 mL i 001 mL 0 Degree of confidence measure of uncertainty or margin of error 1641 4 significant figures 160 3 sig figs after decimal zeros count 000164 3 sig figs before zeros don t count 500 grams could be 500 d 1 g or 500 d 10 g so you should write in scientific notation o 500 x 10 2g 3 sig figs 0 50 x 10 2g 2 sig figs 0 5x 10 2g 1 sig figs Multiplying or dividing gt sig figs in the result sig figs of smallest quantity Rounding off with a 5 235 or 245 round to the nearest even number 24 Adding or subtracting gt decimal places of result decimal places of smallest quantity Exact numbers do not inhibit the number
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