Chapter 2 MEASUREMENT Unit Conversions I II III
- Slides: 11
Chapter 2 MEASUREMENT Unit Conversions I II III West Valley High School General Chemistry
Dimensional Analysis Ø The “Factor-Label” Method w Units, or “labels” are canceled, or “factored” out.
Dimensional Analysis Ø 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.
Dimensional Analysis Ø Lining up conversion factors: 1 in = 2. 54 cm = 1 2. 54 cm 1 in = 2. 54 cm 1= 1 in
Dimensional Analysis Your European hairdresser wants to cut your hair 8 cm shorter. How many inches will he be cutting off? cm in 8 cm 1 in 2. 54 cm = 3. 1 in
Dimensional Analysis Ø How many m. L are in 1 quart of milk? qt 1 m. L qt 1 L 1000 m. L 1. 057 qt 1 L = 946 m. L
Dimensional Analysis Ø How many liters of water would fill a container that measures 75 in 3? in 3 75 in 3 L 2. 54 cm 3 1 L 1 in 3 1000 cm 3 = 0. 19 L
Dimensional Analysis A piece of wire is 1. 3 m long. How many 1. 5 -cm pieces can be cut from this wire? m pieces 1. 3 m 100 cm 1 m 1 piece 1. 5 cm = 87 pieces
Dimensional Analysis Ø You have 1. 5 pounds of gold. Find its volume in cm 3 if the density of gold is 19. 3 g/cm 3. lb cm 3 1. 5 lb 1 kg 1000 g 1 cm 3 2. 2 lb 1 kg 19. 3 g = 35 cm 3
Dimensional Analysis West Valley football needs 550 cm for a 1 st down. How many yards is this? cm 550 cm yd 1 in 1 ft 1 yd 2. 54 cm 12 in 3 ft = 6. 0 yd
Chapter 2 SUTW Prompt Ø Describe how the measurements of SI units, conversion factors, & dimensional analysis are used in chemistry. Ø Complete a 8 -10 sentence paragraph using the SUTW paragraph format. Hilite using green, yellow, and pink. Ø Due Date: Tomorrow (start of class).
