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

2021
Views:

388

Pages:

2
Author:

Tosgobbixb

Names: __KEY_________________________________ 1. What are the three steps in the Scientific Method? a. 1) Perform an experiment, make observations record data; b. 2) Analyze data and propose a hypothesis c. 3) Conduct additional experiments to confirm the hypothesis. 2. Circle the following that are an exact number: 5 feet 5 kittens 3.10 miles 99 bottles of root beer 3. One mL is the exact same as which two units? ____cc__ and ____cm3_____ 4. How many significant digits are in the following numbers? a. 4560 ____3____ d. 50600 ____3_____ b. 0.010200 ____5____ e. 5.000 _____4____ c. 0.1325 ____4______ f. 1090.0 _____5____ 5. 101.1 + 23.643 = _______124.7_______ 6. 3.0 x 12.60 = _____38________ 7. (5.00 / 1.235) + 3.000 + (6.35 / 4.0) = _____8.6_____ 8. What is the average of 0.1707, 0.1713, 0.1720, 0.1704, and 0.1715? ____0.1712_____ 9. Round the following numbers to the correct number of significant figures: a. 6,780 (to 2 s.f.) = __6800___ b. 8.0332 (to 3 s. f.) = ____8.03______ c. 2.3467x104 (to 3 s.f.) = _ 2.35x104___ d. 71.1890 (to 2 s.f.) = ______71_____ 10. Write these numbers in scientific notation. a. 807,000,000,000 = ____8.07 x 1011____ b. 0.00000000530 = _____5.30 x 10-9______ 11. Which of the following is the longest distance? a. 5 000 centimeters b. 30 000 millimeters c. 500 meters d. 0.400 kilometers 12. Which of the following conversions is/are incorrect? Select all that apply. a. 100 mm = 1 cm b. 500 cm = 0.5 m c. 1 m = 1000 mm d. 1 km = 1000 m 13. A marathon is 26.2 miles long. How far is this in kilometers? 1 mile = 1.61 km 26.2 miles ( 1.61 km / 1 mile) = 42.2 km 14. Jamir is training for a race and is running laps around a field. If the distance round the field is 300 yards (exactly), how many complete laps would he need to do in order to run at least 2 miles? 2 miles x (5280 ft / 1 mile) = 10,560 ft x (1 yard / 3 feet) = 3520 yards x (1 lap / 300 yds) = 11.7 laps He would have to run 12 laps to run 2+ miles. 15. Convert 451 mL to ounces. 1 oz = 29.6 mL 451 mL * (1 oz / 29.6 mL) = 15.2 oz 16. What is 7.86 x 10-2 kL in dL? 7.86 x 10-2 kL * (1000 L / 1 kL) * (10 dL / 1 L) = 786 dL 17. Convert 75 minutes to days. 75 minutes * (1 hr / 60 minutes) * (1 day / 24 hours) = 0.052 days 18. If a can of soup contains 22.0 ounces (oz) of soup, how many grams of soup is that? (1 lb = 16 oz; 1 lb = 454 g) 22.0 oz * (1 lb / 16 oz) * (454 g / 1 lb) = 624 g 19. A length of glass tubing is 0.525 m. How many inches long is the tubing? 1 inch = 2.54 cm 0.525 m * (100 cm / 1m) * (1 in. / 2.54 cm) = 20.7 in. 20. What is the density (in g/mL) of a sample of mineral oil if 250. mL of oil has a mass of 0.23 kg? 0.23 kg * (1000 g / 1 kg) = 230 g 230 g / 250 mL = 0.92 g/mL 21. 150 is 25% of what number? 150 / x * 100 = 25% 150 = 0.25 * x x = 600 22. You’re eating at a restaurant where your total bill comes to $34.54. You want to tip the server 18% for good service. How much tip should you leave and what is the total bill? 34.54 * 0.18 = $6.22 $34.54 + $6.22 = $40.76 23. Peter scored 27 out of 50 on a test. What percent did he get correct? 27 / 50 x 100 = 54%