1 / 10

Chapter 3

Chapter 3 . Problem Solving in Chemistry. 3 Methods of Solving Problems. K h da b d c m Factor Labeling Formula. Metric Conversions. M- - K h da b d c m - - µ - - n Show original number Use arrows to show movement of decimal Rewrite final answer. Unit Conversions.

suchi
Download Presentation

Chapter 3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 3 Problem Solving in Chemistry

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

  3. Metric Conversions • M- - K h da b d c m - - µ - - n • Show original number • Use arrows to show movement of decimal • Rewrite final answer

  4. Unit Conversions • Any number divided by itself is equal to 1 • 6/6 = 1 • 6 meters/6 meters = 1 • Any number can be multiplied by one without changing its value • 5 x (6/6) = 5 • 5 x (6 meters/6 meters) = 5

  5. Converting Units Through Dimensional Analysis • Equal units divided by one another are equal to 1 • 1m/100 cm = 1 ? • 100 cm/1m = 1 ? • 50 cm x (1m/100cm) = 0.5 m • 50 m x (100cm/1m) = 5000 cm

  6. Factor Labeling • Start with known value • Place known units in denominator • Place answer units in numerator • Fill in equality • Cancel units • Write answer from calculator • Round answer to correct sig figs • Circle answer with units

  7. Practice Problems • 12.5 eggs = ? Dozen • 13.69 m = ? cm • 13.69 km = ? cm • 1.25 x 103 ft = ? yd

  8. Multiple Step Factor Labeling • 5.2 x103 yd = ? In • 45 mph = ? ft/min • 3.1 g/mL = ? Kg/L

  9. 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

  10. 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?

More Related