1. Prefix Notes MEASUREMENTS

2. SIGNIFICANT FIGURES Rules for Counting Significant Figures 1.Nonzero integers always count as significant figures. 1457 has 4 significant figures 23.3has 3 significant figures

3. Increase or decrease basic unit by 10 Form new units larger or smaller than the basic units Indicate a numerical value prefix=value 1 kilometer=1000 meters 1 kilogram=1000 grams 3 METRIC PREFIXES

4. PrefixSymbolValue giga-G1 000 000 000 mega-M1 000 000 kilo-k1 000 4 PREFIXES THAT INCREASE A UNIT

5. PrefixSymbolValue deci- d0.1 centi- c0.01 milli- m0.001 micro- u 0.000 001 nano- n0.000 000 0001 5 PREFIXES THAT DECREASE A UNIT

6. Match 1) length 2) mass 3) volume _ A. A bag of tomatoes is 4.6 kg. __ B. A person is 2.0 m tall. __ C. A medication contains 0.50 g Aspirin. __ D. A bottle contains 1.5 L of water. 6 LEARNING CHECK 2 1 2 3

7. Indicate the prefix to use for 1. A mass that is 1000 times greater than 1 gram 2. A length that is 1/100 of 1 meter? 3. A unit of time that is 1/1000 of a second. 7 LEARNING CHECK 1) kilo 2) milli3) mega 1) deci 2) centi 3) milli 1) nanosecond2) microsecond 3)millisecond

8. Sig Figs Notes MEASUREMENTS

9. SIGNIFICANT FIGURES Rules for Counting Significant Figures 2.Zeros a.Leading zeros - never count 0.0025 2 significant figures b.Captive zeros (zero sandwich) - always count 1.008 4 significant figures c.Trailing zeros - count only if the number is written with a decimal point 100 1 significant figure 100. 3 significant figures 120.0 4 significant figures

10. SIGNIFICANT FIGURES Rules for Counting Significant Figures 3.Exact numbers - unlimited significant figures Not obtained by measurement  Determined by counting: 3 apples  Determined by definition: 1 in. = 2.54 cm

11. SIGNIFICANT FIGURES Rules for Addition and Subtraction The number of significant figures in the result is the same as in the measurement with the smallest number of decimal places.

12. SIGNIFICANT FIGURES Rules for Multiplication and Division The number of significant figures in the result is the same as in the measurement with the smallest number of significant figures.