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### 21 Cards in this Set

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 Do non-zero integers always count as sigfigs? yes You should know this. Leading zeros and zeros that precede nonzero digits are not significant? no, they are not. You should know this. How many sigfigs does 0.0025 have? 2 See preceding card. Do captive zeros and zeros between digits count as sigfigs? yes How many sigfigs are in 1.008? 4 When are trailing zeros sigfigs? when the # contains a decimal point How man sigfigs does 100 have? How about 1.00 X 10^2? 100 has only 1 sigfig whereas 1.00 has 3 sigfigs. How many sigfigs does 100. have? 3 sigfigs; this is a trick question. The addition of the period after the 100 makes all figures sigfigs. The period following the 100 is not a typo. How many sigfigs are in 0.0105? And in 0.050080? 3 in the first and 5 in the second; because the 0.0 are not trailing zeros, they are not sigfigs; same for second question. What do we know about leading zeros? How many sigfigs are in 8.050 X 10^-3? 4 because there is a decimal which makes all trailing 0's sigfigs When (*) and (/), the number of sigfigs in the result is the same as the number in the least precise measurement used in the calculation. 4.56 *1.4 <-- Limiting term ----- 6.38 --> 6.4 For (+) and (-), the result has the same number of decimal places as the least precise measurement used int he calculation. 12.11 18.0 <-- Limiting term + 1.013 ------- 31.123 ---> 31.1 When doing calculations, carry extra digits through to final result. Do rounding at the end of the calculation. If digit to be removed is: a) < 5, do what? b) > 5, then what? c) = to five, then? a) preceeding digit stays the same b) preceeding digit +1 c) +1 if preceeding digit odd and stays the same if preceeding digit is odd How do you convert from one unit to another? Ex.: You want to order a bike with a 25.5-in. frame, but the sizes are given in cm only. What size should you order? 2.54 in * 2.54 cm = 64.8 cm ---- 1in. * The in. cancel out and you are left with cm. * To do dimensional analysis (convert from 1 unit to another), use the equivalence statement that relates the 2 units * Derive the appropriate unit factor by looking at the direction of the required change (to cancel unwanted units) * Mult. the qty. 2b converted by the unit factor to give the qty. with desired units How do you convert from K to C? T(K) = T(C) + 273.15 How do you convert from C to K? T(C) = T(K) - 273.15 What is the formula to determine density? D = mass / volume holder holder holder holder What is the organization of matter? See image