1. Chapter 1 Units of Measurement –Length, mass, volume, time, temperature –Units Uncertainty in Measurement –Precision and Accuracy

2. Significant Figures –Ex. 20.5, 0.076, 100, 15.3 –Math multi and divide, least sig. figs. 41 x 0.03 = 210 / 5.01 = –add and subtract, least dec. pts. 62 – 5.5 = 7.53 + 0.2 =

3. Scientific Notation A way to write really large or small numbers 150000 = 1.5 x 10 5 0.000043 = 4.3 x 10 -5 Only the sig. figs. are used in sci. notation Be careful when adding/subtracting, make sure powers are equal

4. Dimensional Analysis Ex. How far do we travel if we drive 3 hours at 60 mi/hr? –3 hr x 60 mi/hr = 180 mi = 200 mi sig. figs. Ex. How many minutes are in 60 years? –60 yr x 365.25 d/yr x 24 hr/d x 60 min/hr

5. Temperature 0 C, 0 F, K Eq. Tf = Tc x 9/5 + 32 Tk = 0 c + 273 22 0 c = ? 0 f Tf = 22 x 9/5 + 32 = 71.6 0 f 45 0 f = ? 0 c Tc = (45 – 32) x 5/9 = 7.2 0 c

6. Density Ex.s –What’s the density of a 15 g sample that occupies 5 ml of space? –15 g / 5 ml = 3 g/ml –How much volume does gasoline occupy if you have 5000g and the density is 0.79 g/ml? –5000g x 1ml / 0.79g = 6330 ml = 6000 ml s.f.

7. Classification of Matter –Mixtures –Solutions Physical changes Separation methods –Filtration –Distillation –Chromatography