Chapter 2

1.From what material could evidence be found that might yield a conviction of “Tommy Karate?” water samples soil grass and leaves wood samples 17

2.What is a characteristic of a chemical change? 20 a substance melts or freezes a material evaporates neither of the above both of the above

3.Which of the following does the scientific method utilize? 20 collecting relevant data forming a hypothesis testing the hypothesis all of the above

4.The scientific method tries to determine the nature of the problem. 20 True False

5.What is the difference between mass and weight? 20 All matter has weight, but not all matter has mass. Weight is a measure of the pull of matter to a scale or measuring device, while mass is a measure of how much matter weighs. All matter has mass, but only limited amounts have weight. Weight is a measure of the pull of matter to the earth, while mass is a measure of how much matter is in a sample.

6.Burning is an example of a physical change. 20 True False

7.What is 4.54 m in cm? 20 454 cm 45.4 cm 4540 cm 0.00454 cm

8.How many millimeters are in a centimeter? 0.01 1,000 100 10 18

9.What is the abbreviation for liters, a unit of volume? Lt l lt 19

10.A gram is a smaller unit of mass than a kilogram. 20 True False

11.There are 100 meters in a kilometer. True False

12.How many milligrams are there in 0.003 g? 0.3 3 30 300

13.Convert 150 mL to L: 15.0 0.015 0.15 1.50

14.How many milliliters are in 0.568 L? 56.8 5.68 0.0568

15.How many inches are there in 2.54 cm.? 2.00 1.00 10 14.3 16

16.How many yards are in 126 ft.? 12.75 1512 42 378 10

17.Convert 2.0 ft. to cm. 0.75 1.4 8.9 61 18

18.How many significant figures are there in the number 0.00603? 20 3 2 4 5

19.The number 26.0 has how many significant figures? 20 2 3 1 4

20.How many significant figures are there in the number 2056? 4 3 2 1

21.How many significant figures does the number 36.120 have? 4 5 6

22.How many significant figures are there in the number 100,000? 6 3 19

23.How many significant figures should the answer to this question have: 4.5 x 13.669 = 20 1 2 3 4

24.How many significant figures should the answer to the following calculation have? 18.03 / 6.2 = 20 1 2 3 4

25.How many significant figures should the answer to this question have: 14 x 3.078 = 20 2 6 4 Three spots after decimal

26.Which of the following represent three measurements that are the most precise? 20 2.35, 2.20, and 2.28 1.02, 0.82, and 1.87 1.11, 1.93, and 1.90 3.20, 3.22, and 3.19

27.Which of the following represent three measurements that are the least precise? 2.34, 2.40, and 2.37 14.2, 14.1, and 14.3 3.45, 45.3, and 13.1 35.2, 35.5, and 35.4 20

28. If a true value for the mass of a sample is 0 28.If a true value for the mass of a sample is 0.300 g, which of the following is the most accurate? 20 0.305g 0.299g 0.304g 0.293g

29. What is the density of a sample with a volume of 10 29.What is the density of a sample with a volume of 10.0 mL and a mass of 13.9 g? 20 1.39 g/mL 3.90 g/mL 139.0 g/mL 0.719 g/mL

30.Liquids are not always less dense than solids. 20 True False

31. What is the volume of a material with a density of 1 31.What is the volume of a material with a density of 1.11 g/mL and a mass of 6.66 g? 1.55 mL .200 mL 6.00 mL 6.11 mL 20

32. A sample with a density of 6. 01 g/mL and a volume of 2 32.A sample with a density of 6.01 g/mL and a volume of 2.00 mL has what mass? 20 0.333 g 3.05 g 12.0 g 4.04 g

33. Which of the following pieces of glassware can be used to measure the volume of a liquid with the greatest precision 19 Test tube Electronic balance Triple beam balance Graduated cylinder

34. Which set of procedures and observations indicates a chemical change? 20 A cool, shiny metal like sodium is added to water in a beaker and rapid bubbling and possible flames occur. Gasoline is poured into an open container and it eventually disappears. A solid is heated and slowly turns into a liquid. Large chunks or salt are crushed with a mortar and pestle and become powder.