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measurements_calculations

# measurements_calculations - Measurements and Chemical...

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1 Measurements and Chemical Calculations 1. Exponential(scientific notation) A) N = C x 10 e Number coefficient exponential 1. Move decimal point left or right to make coefficient 1-9 2. Count up the number of times the decimal point moves, this is the exponential. 3. a) left makes exp. Positive, bigger than 1. b) right makes exp. Negative, smaller than 1. Ex. 0.00067 6.7 x 10 -4 724000.0 7.24 x 10 5 0.034 x 10 -3 3.4 x 10 -5 516.0 x 10 4 5.160 x 10 6 0.0056 x 10 -8 5.6 x 10 -5 B) multiplication and division Mult. 10 a x 10 b = 10 a + b Div. 10 a ÷ 10 b = 10 a - b Ex. (3.26 x 10 4 )(1.54 x 10 6 ) = 5.02 x 10 10 (6.73 x 10 -3 )(9.11 x 10 -3 ) = 6.13 x 10 -5

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2 (8.94 x 10 6 )/(4.35 x 10 4 ) = 2.06 x 10 2 (3.05 x 10 -6 )(2.19 x 10 -3 )/(5.48 x 10 -5 ) = 1.22 x 10 -4 2. Measurements- a. Our system. US. b. S.I. – metric rest of the world. 1. Mass is the measurement of the quantity of matter. Weight is the measurement of the force of gravitational attraction. Mass – unit gram (g) Kilogram(kg) 1.0 kg = 2.2 lbs 2. Length- meter(m) Centimeter(cm) 1 m = 39.37 inch 3. Volume- liter(L) Milliliter(mL) = 1cm 3 = 1cc 4. Temperature Difference 180 ° 100 ° 100 ° Kelvin = absolute zero, no kinetic energy. Δ ° C Δ ° F Δ K Δ ° F Δ K = Δ ° C freezing boiling Fahrenheit Celsius Kelvin 212 0 32 0 100 0 0 0 373 273
3 conversion- T ° C = (T ° F – 32)/1.8 T ° F = 1.8T ° C + 32 K = ° C + 273 Room temp = 72 ° F convert to ° C.

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measurements_calculations - Measurements and Chemical...

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