Dimensional Analysis Chemistry 1 Initial and Final Units

Initial and Final Units 1. A person has a height of 2. 0 meters.

Steps to Problem Solving n n n n Read problem Write down what you

How many minutes are in 2. 5 hours? Initial unit 2. 5 hr Conversion

Learning Check A rattlesnake is 2. 44 m long. How long is the snake

Solution A rattlesnake is 2. 44 m long. How long is the snake in

Learning Check How many seconds are in 1. 4 days? Unit plan: days hr

Solution CF 2 Unit plan: days hr min seconds 2 SF Exact 1. 4

Unit Check What is wrong with the following setup? 1. 4 day x 1

Learning Check If the ski pole is 9. 67 x 10^-4 km in length,

Solution 9. 67 x 10^-4 km x _______ Lecture. PLUS Timberlake 12

Solution 9. 67 x 10^-4 km x 1 x 10^3 m 1 km Lecture.

Solution 9. 67 x 10^-4 km x 1 x 10^3 m x _______ 1

Solution 9. 67 x 10^-4 km x 1 x 10^3 mm = 967 1

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Dimensional Analysis Chemistry 1

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/m. L. If a person lost 0. 30 pints of blood at 18°C, how many ounces of blood would that be? Initial = pints Final unit = _______ Lecture. PLUS Timberlake 2

Steps to Problem Solving n n n n Read problem Write down what you know Time symbol and draw a line Select conversion factors Cancel units and check Do math on calculator Give an answer using significant figures Lecture. PLUS Timberlake 3

How many minutes are in 2. 5 hours? Initial unit 2. 5 hr Conversion factor 2. 5 hr x 60 min 1 hr cancel Final unit = 150 min Answer (2 SF) Lecture. PLUS Timberlake 4

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 Lecture. PLUS Timberlake 5

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 Lecture. PLUS Timberlake 6

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 Lecture. PLUS Timberlake 7

Solution CF 2 Unit plan: days hr min seconds 2 SF Exact 1. 4 day x 24 hr x 60 min x 60 sec 1 day 1 hr 1 min = 1. 2 x 105 sec Lecture. PLUS Timberlake 8

Unit Check What is wrong with the following setup? 1. 4 day x 1 day 24 hr x 60 min x 60 sec 1 hr 1 min Lecture. PLUS Timberlake 9

Steps to Problem Solving n n n n Read problem Write Down what you know time symbol and draw a line Select conversion factors Cancel units and check Do math on calculator Give an answer using significant figures Lecture. PLUS Timberlake 10

Learning Check If the ski pole is 9. 67 x 10^-4 km in length, how long is the ski pole in mm? Lecture. PLUS Timberlake 11

Solution 9. 67 x 10^-4 km x _______ Lecture. PLUS Timberlake 12

Solution 9. 67 x 10^-4 km x 1 x 10^3 m 1 km Lecture. PLUS Timberlake 13

Solution 9. 67 x 10^-4 km x 1 x 10^3 m x _______ 1 km Lecture. PLUS Timberlake 14

Solution 9. 67 x 10^-4 km x 1 x 10^3 mm = 967 1 km 1 m Lecture. PLUS Timberlake 15