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Chapter 3

Chapter 3 . Problem Solving in Chemistry. 3 Methods of Solving Problems. K h da b d c m Factor Labeling Formula. Move the decimal to the left. Move the decimal to the right. Metric Conversions. Every metric unit is different from its neighbor by a factor of ten

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Chapter 3

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  1. Chapter 3 Problem Solving in Chemistry

  2. 3 Methods of Solving Problems • K h da b d c m • Factor Labeling • Formula

  3. Move the decimal to the left Move the decimal to the right Metric Conversions • Every metric unit is different from its neighbor by a factor of ten • When converting between two units the decimal point is moved the number of places equal to the distance between the two unit in the chart above and in the same direction of movement

  4. Move the decimal to the left Move the decimal to the right Sample problem Convert the following 53 hg = ________dg Start with 53. Move the decimal 3 spaces to the right 53 Fill in the empty spaces with zeros 53000 dg

  5. Move the decimal to the left Move the decimal to the right Sample Problem Convert the following 300 cg = ________kg Start with 300. Move the decimal 5 spaces to the left 300 Fill in the empty spaces with zerosvvvvvvvv0.00300 kg

  6. More Practice Problems Convert the following 0.058 dam = _______ dm 0.25 cL = _______ L 109 hg = ________ mg 5.8 0.0025 10900000

  7. Factor Label Method of Conversion 100 cm = 1 m 1 m = 100 cm Use conversion factors to systematically move from one unit to the next, cancelling out units on the diagonal in each step. Convert 18 m = _______ cm 100 cm 18m = 1800 cm 1 m

  8. 5 mL 1 L 1000 mL 1 tsp Multistep Factor Label Problems Convert 350 tsp = ______ L Using the following conversion factors 1 tsp = 5 mL 1 L = 1000 mL 350 tsp = 1.75 L

  9. Multistep Factor Label Practice Convert 3 min= ______ms Use 1 min=60 s and 1000 ms = 1 s Convert 32oz = _____ g Use 16 oz=1 lb, 2.2 lb = 1kg, 1kg=1000 g

  10. 25 g 100mL 1 mL 1 dL Multidimensional Factor Label Problems Convert 25 g/mL = ______ kg/dL • Convert one unit at a time • Recognize that one unit is in the denominator 1 Kg =2.5kg/dL 1000 g

  11. Multidimensional Factor Label Practice Convert 85 km/hr = _________m/s Convert 0.6 L/min = ________ qt/hr Use 1qt = 1.1L

  12. Word Problems • Show basic equation • Rearrange to create WORKING EQUATION • Plug in numbers • Cancel units • Show calculator answer • Round to correct sig figs • Circle answer with units

  13. Sample Word Problem • What is the mass of an object if it has a density of 5.63 g/mL and a volume of 32.1 cm3?

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