University:
Glendale Community College
Course:
CHM130 | Fundamental Chemistry
Academic year:

2022
Views:

319

Pages:

1
Author:

ipotonicsi3

QUIZ 1 KEY 47,030 (or 4.703x104) 1. Round 47,027 to 4 significant figures. (2 points) 2. How many significant figures are present in the following numbers? (2 points) a) 56.3800 6 b) 0.0002087 4 3. Perform the following operations, expressing each answer to the correct number of significant figures. (6 pts) a) (7.61 × 10ￚ7) × (2.5 × 105) = 1.9x10-1 ⇐ answer rounded to 2 sig figs since 2.5x105 has fewest sig figs 363 b) 342 + 16.37 + 4.4 = ⇐ answer rounded to one’s place since 342 is has fewest decimal places 4. Convert these measurements to the indicated units. SHOW SET-UP OR NO CREDIT GIVEN! (10 pts) a) 21.2 m = 2120 b) 168 mL = 0.168 L c) 972 cg = 0.00972 kg 5. Convert 85.5 cm 21.2 m 100 cm × = 2120 cm 1m 168 mL × 972 cg 1g 1 kg × = 0.00972 kg 100 cg 1000 g × 1L = 0.168 L 1000 mL km mile to . (Given: 1.61 km = 1 mile) SHOW SET-UP OR NO CREDIT hr s GIVEN! (5 points) 85.5 km 1 mile 1 hr 1 min mile × × × = 0.0148 hr 1.61 km 60 min 60 s s Final answer = 0.0148 mile/s (this was rounded to 3 sig figs)