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Problem Solving in Chemistry

Problem Solving in Chemistry. Dimensional Analysis a way to analyze and solve problems using units or dimensions of measurements. Problem Solving in Chemistry. Examples - What is the mass, in grams, of a piece of lead that has a volume of 19.84 cm 3 and a density of 11.4 g/cm 3 ? Known:

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Problem Solving in Chemistry

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  1. Problem Solving in Chemistry Dimensional Analysis a way to analyze and solve problems using units or dimensions of measurements

  2. Problem Solving in Chemistry Examples - What is the mass, in grams, of a piece of lead that has a volume of 19.84 cm3 and a density of 11.4 g/cm3 ? Known: Volume of lead= 19.84 cm3 D = 11.4 g/cm3 Unknown: Mass = g Calculate: D = m/v m = 226 g Make sure you include units with everything!

  3. Problem Solving in Chemistry A small piece of gold has a volume of 1.35 cm3; the density of gold is 19.3 g/cm3. What is the value of this piece if the market value of gold is $11/g? Known: Volume of gold= 1.35 cm3 D = 19.3 g/cm3 Unknown: Mass = g Calculate: D = m/v $290 Don’t round until you are finished!

  4. Conversion Factors 0.044 km to meters 4.6 mg to grams 8.9 m to decimeters 0.107 g to centigrams 44 m 4.6x10-3 g 89 dm 10.7 cg

  5. Problem Solving in Chemistry The directions for an experiment ask each student to measure out 1.84 g of copper (Cu) wire. The only copper wire available is a spool with a mass of 50.0 g. How many students can do the experiment before the copper runs out? 27 students

  6. Problem Solving in Chemistry The radius of a potassium atom is 0.227 nm. Express this radius in centimeters. How many seconds are there in one day? 2.27 x10-8 cm 8.64 x104 s

  7. Problem Solving in Chemistry A flask that can hold 158 g of water at 4°C can hold only 127 g of ethanol. What is the density of ethanol? How many kilograms of water are needed to fill an aquarium that measures 40.0cm by 20.0cm by 30.0cm? 0.804 g/mL 24 kg

  8. Problem Solving in Chemistry A watch loses 0.15 s every minute. How many minutes will the watch lose in 1 day? - A cheetah can run 112 km/h over a 100-m distance. What is this speed in meters per second? 2.0 x10-6 min 31.1m/s

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