Dimensional Analysis Chemistry.

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Presentation transcript:

Dimensional Analysis Chemistry

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

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

How many minutes are in 2.5 hours? Initial unit 2.5 hr Conversion Final factor unit 2.5 hr x 60 min = 150 min 1 hr cancel LecturePLUS Timberlake

LecturePLUS Timberlake Learning Check A rattlesnake is 2.44 m long. How long is the snake in cm? 1) 2440 cm 2) 244 cm 3) 24.4 cm LecturePLUS Timberlake

LecturePLUS Timberlake Solution A rattlesnake is 2.44 m long. How long is the snake in cm? 2) 244 cm 2.44 m x 100 cm = 244 cm 1 m LecturePLUS Timberlake

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

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 = 120000 sec LecturePLUS Timberlake

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

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

LecturePLUS Timberlake Learning Check If the ski pole is 0.000967 km in length, how long is the ski pole in mm? LecturePLUS Timberlake

LecturePLUS Timberlake Solution 0.000967 km x _______ LecturePLUS Timberlake

LecturePLUS Timberlake Solution 0.000967 km x 1000 m 1 km LecturePLUS Timberlake

LecturePLUS Timberlake Solution 0.000967 km x 1000 m x _______ 1 km LecturePLUS Timberlake

LecturePLUS Timberlake Solution 0.000967 km x 1000 m x 1000 mm = 967 1 km 1 m LecturePLUS Timberlake