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Dimensional Analysis Chemistry.

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Presentation on theme: "Dimensional Analysis Chemistry."— Presentation transcript:

1 Dimensional Analysis Chemistry

2 Initial and Final Units
1. A person has a height of 2.0 meters. What is that height in inches? Initial unit = m Final unit = _______ 2) Blood has a density of 0.05 g/mL. If a person lost 0.30 pints of blood at 18°C, how many ounces of blood would that be? Initial = pints Final unit = _______ LecturePLUS Timberlake

3 Steps to Problem Solving
Read problem Write down what you know Time symbol and draw a line Select conversion factors Cancel units and check Do math on calculator LecturePLUS Timberlake

4 How many minutes are in 2.5 hours?
Initial unit 2.5 hr Conversion Final factor unit 2.5 hr x min = min 1 hr cancel LecturePLUS Timberlake

5 LecturePLUS Timberlake
Learning Check A rattlesnake is 2.44 m long. How long is the snake in cm? 1) cm 2) 244 cm 3) 24.4 cm LecturePLUS Timberlake

6 LecturePLUS Timberlake
Solution A rattlesnake is 2.44 m long. How long is the snake in cm? 2) 244 cm 2.44 m x cm = 244 cm 1 m LecturePLUS Timberlake

7 LecturePLUS Timberlake
Learning Check How many seconds are in 1.4 days? Unit plan: days hr min seconds 1.4 days x 24 hr x ?? 1 day LecturePLUS Timberlake

8 LecturePLUS Timberlake
Solution CF2 Unit plan: days hr min seconds 1.4 day x 24 hr x 60 min x 60 sec 1 day 1 hr 1 min = sec LecturePLUS Timberlake

9 LecturePLUS Timberlake
Unit Check What is wrong with the following setup? 1.4 day x 1 day x min x 60 sec 24 hr hr min LecturePLUS Timberlake

10 Steps to Problem Solving
Read problem Write Down what you know time symbol and draw a line Select conversion factors Cancel units and check Do math on calculator LecturePLUS Timberlake

11 LecturePLUS Timberlake
Learning Check If the ski pole is km in length, how long is the ski pole in mm? LecturePLUS Timberlake

12 LecturePLUS Timberlake
Solution km x _______ LecturePLUS Timberlake

13 LecturePLUS Timberlake
Solution km x m 1 km LecturePLUS Timberlake

14 LecturePLUS Timberlake
Solution km x m x _______ 1 km LecturePLUS Timberlake

15 LecturePLUS Timberlake
Solution km x 1000 m x 1000 mm = km 1 m LecturePLUS Timberlake

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