Chapter 2 MEASUREMENT

# Chapter 2 MEASUREMENT

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## Chapter 2 MEASUREMENT

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1. Chapter 2 MEASUREMENT Unit Conversions West Valley High School General Chemistry Mr. Mata

2. Dimensional Analysis • The “Factor-Label” Method • Units, or “labels” are canceled, or “factored” out.

3. Dimensional Analysis • Steps: 1. Identify starting & ending units. 2. Line up conversion factors so units cancel. 3. Multiply all top numbers & divide by product of bottom numbers. 4. Check units & final answer.

4. Dimensional Analysis • Lining up conversion factors: = 1 1 in = 2.54 cm 2.54 cm 2.54 cm 1 = 1 in = 2.54 cm 1 in 1 in

5. cm in Dimensional Analysis Your European hairdresser wants to cut your hair 8 cm shorter. How many inches will he be cutting off? 8 cm 1 in 2.54 cm = 3.1 in

6. qt mL  Dimensional Analysis • How many mL are in 1 quart of milk? 1 L 1.057 qt 1000 mL 1 L 1 qt = 946 mL

7. in3 L Dimensional Analysis • How many liters of water would fill a container that measures 75 in3? 1 L 1000 cm3 2.54 cm3 1 in3 75 in3 = 0.19 L

8. m pieces Dimensional Analysis A piece of wire is 1.3 m long. How many 1.5-cm pieces can be cut from this wire? 1 piece 1.5 cm 100 cm 1 m 1.3 m = 87 pieces

9. lb cm3 Dimensional Analysis • You have 1.5 pounds of gold. Find its volume in cm3 if the density of gold is 19.3 g/cm3. 1 cm3 19.3 g 1 kg 2.2 lb 1000 g 1 kg 1.5 lb = 35 cm3

10. cm yd Dimensional Analysis West Valley football needs 550 cm for a 1st down. How many yards is this? 1 ft 12 in 1 yd 3 ft 1 in 2.54 cm 550 cm = 6.0 yd

11. Chapter 2 SUTW Prompt • Describe how the measurements of SI units, conversion factors, & dimensional analysis are used in chemistry. • Complete a 8-10 sentence paragraph using the SUTW paragraph format. Hilite using green, yellow, and pink. • Due Date: Tomorrow (start of class).