1. I II III Unit Conversions Chapter 2 MEASUREMENT 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 in = 2.54 cm 2.54 cm 1 in = 2.54 cm 1 in 1 in = 1 1 =

5. Dimensional Analysis Your European hairdresser wants to cut your hair 8 cm shorter. How many inches will he be cutting off? 8 cm1 in 2.54 cm = 3.1 in cmin

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

7. Dimensional Analysis  How many liters of water would fill a container that measures 75 in 3 ? 75 in 3 2.54 cm 3 1 in 3 = 0.19 L in 3 L 1 L 1000 cm 3

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

9. Dimensional Analysis  You have 1.5 pounds of gold. Find its volume in cm 3 if the density of gold is 19.3 g/cm 3. lbcm 3 1.5 lb 1 kg 2.2 lb = 35 cm 3 1000 g 1 kg 1 cm 3 19.3 g

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

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).