Prefix Notes MEASUREMENTS. SIGNIFICANT FIGURES Rules for Counting Significant Figures 1.Nonzero integers always count as significant figures. 1457 has.

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Presentation transcript:

Prefix Notes MEASUREMENTS

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

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

PrefixSymbolValue giga-G mega-M kilo-k PREFIXES THAT INCREASE A UNIT

PrefixSymbolValue deci- d0.1 centi- c0.01 milli- m0.001 micro- u nano- n PREFIXES THAT DECREASE A UNIT

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

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

Sig Figs Notes MEASUREMENTS

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

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

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.

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.