Kilogram and Question

Quiz 2: Questions and answers from week 2 covering Chapters 3 and 5 in Cracolice and Peters. Question 1: Which of the following numbers are correctly expressed in exponential notation? i. 43,200,000 = 4.32 x 10 7 ii. 0.000977 = 9.77 x 10 4 iii. 606,000 = 6.06 x 10 -5 iv. 0.00000175 = 1.75 x 10 -6 Answer: i and iv Question 2: Which of the following numbers are correctly expressed in ordinary decimal form? i. 6.21 x 10 5 = 621,000 ii. 7.28 x 10 6 = 0.00000728 iii. 9.03 x 10 -4 = 0.000903 iv. 1.12 x 10 -3 = 1120 Answer: i and iii Question 3: Complete the following operation: 8.36 x 106 + 1.320 x 107 Answer: 2.156 x 107 Question 4: Complete the following operation:

Answer: 0.246 Question 5: What will be the cost in dollars for photocopies if you have 32 pages in a booklet, you need 175 booklets, and copies are 4.5 cents each? Answer: $252 Question 6: Which of the following is/are metric units of mass? i. Pound ii. Gram iii. Ounce iv. Kilogram v. Centigram Answer: ii, iv, and v Question 7: Which of the following is/are metric units of volume? i. mL ii. L iii. cm3 iv. m v. kg Answer: i, ii, and iii Question 8: Convert 373 liters to milliliters, centiliters, and kiloliters. Answer: 373,000 mL, 37,300 cL, 0.373 kL Question 9: Convert 5.01 x 103 cm to km, m, and mm. Answer: 5.01 x 10-2 km, 5.01 x 101 m, 5.01 x 104 mm

Question 10: How many significant figures are in each of the following quantities? i. 0.00062 kg ii. 0.720 in. iii. 4.150 x 103 s iv. 0.305 m3 Answer: i. 2 ii. 3 iii. 4 iv. 3 Question 11: Round off each of the following quantities to two significant figures: i. 32,175,000 µm ii. 3.3000 x 107 kg iii. 0.04721 m iv. 8751 cm3 Answer: i. 3.2 x 107 µm ii. 3.3 x 107 kg iii. 0.047 m iv. 8.8 x 103 cm3 Question 12: An empty crucible has a mass of 25.70 g. After some copper(II) sulfate pentahydrate is added, the mass is 28.855 g. What is the mass of the copper(II) sulfate pentahydrate in the crucible? Answer: 3.16 g Question 13: Assuming that all are measured