2. Explain why mass is used instead of weight in scientific studies.

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1 Unit 1 Lab Safety and Scientific Inquiry True/False Indicate whether the statement is true or false. Use the table to answer the question. Substance Color Mass Silver light grey 5.6 g Gold yellow 2.8 g 1. The sample s color is a qualitative measurement. Short Answer Essay 2. Explain why mass is used instead of weight in scientific studies. 3. Design an experiment to test the effects of drinking caffeinated beverages on students heart rates. In your answer, include a description of your hypothesis, independent and dependent variables, constants, and controls. Multiple Choice Identify the choice that best completes the statement or answers the question. 4. Which is a qualitative measurement? a. color c. time b. mass d. length 5. Which is a quantitative measurement? a. hardness c. taste b. color d. temperature 6. Which of the following is qualitative data? a. Color c. Temperature b. Pressure d. Volume 7. Which of the following is quantitative data? a. Color c. Shape b. Odor d. Volume 8. Which is the part of an experiment that serves as the point of comparison for the results? a. hypothesis c. constant b. independent variable d. control 9. Which is the part of the experiment that is the measurable outcome? a. independent variable c. control b. dependent variable d. conclusion 10. Which precaution should you take when you see this symbol? a. do not look directly at the experiment b. wear goggles if you are doing the experiment c. wear goggles if you are performing or observing the experiment d. watch the teacher carefully and follow what he or she does 11. Which precaution should you take when you see this symbol?

2 a. Wear heat-resistant gloves c. Do not touch broken glass b. Wear protective clothing d. Contents are radioactive 12. Which precaution should you take when you see this safety symbol? a. wear heat- and cold-resistant gloves c. do not touch toxic substances b. do not touch sharp objects d. wash your hands after the lab 13. Which describes what happens when you fly 10 km above the Earth s surface? a. mass decreases, weight increases b. mass decreases, weight decreases c. mass decreases, weight remains constant d. mass remains constant, weight decreases A student conducts an experiment to determine the effect of adding salt on the boiling temperature of water. The results are shown below. Sample Amount of Salt Boiling Temperature Sample 1 0 g C Sample 2 2 g C Sample 3 5 g C Sample 4 10 g C 14. Which is the independent variable in this experiment? 15. Which is the dependent variable in this experiment? 16. Which is a value that should remain constant for all samples in this experiment? 17. Which is the control in this experiment? a. Sample 1 c. Sample 3 b. Sample 2 d. Sample Which is a reasonable hypothesis for this experiment? a. If salt is added to water, the water will boil at a higher temperature b. Salt makes water boil c. If water is boiling, it must have salt added to it d. If salt is added to water, the water will get cloudy 19. Which is the part of the experiment that the researcher manipulates? a. independent variable c. control b. constants d. dependent variable 20. Which term describes the amount of mass contained per unit volume? a. mass c. length b. temperature d. density 21. Which kind of graph would be best to use with these data? M&M s in a bag Color Orange Brown Yellow Green Blue Red Percent

3 a. Line graph c. Bar graph b. Circle graph d. None of the above 22. Which kind of graph would be best to use with these data? Amt of Salt added 0 g 2 g 5 g 10 g 15 g Boiling temp, C a. Line graph c. Bar graph b. Circle graph d. None of the above 23. Which is the correct measurement for location marked by the arrow? a c. 52 b d Which is the correct measurement for location marked by the arrow? a c b d Which is the correct measurement for location marked by the arrow? a c b d An object has a mass of grams and a volume of cubic centimeters. What material is it likely to be made of? Substance iron gold silver copper Density (g/cm 3 ) a. Iron c. Silver b. Gold d. Copper 27. Calculate the slope of the line in the graph. 5 y x a. 0 c. 3 b. 1 d The graph represents the sales data for a particular product. In which week were 8 units sold?

4 Sales (units) Weeks a. 3 rd week c. 6 th week b. 4 th week d. 9 th week 29. Which of the following are in the correct order from smallest to largest? a. Millimeter, meter, centimeter, kilometer b. Millimeter, centimeter, meter, kilometer c. Centimeter, millimeter, meter, kilometer d. Meter, millimeter, centimeter, kilometer 30. How many seconds are there in three days? a. 72 seconds b. 4,320 seconds c. 259,200 seconds d. 86,400 seconds 31. Compared to your weight and mass on Earth, if you were on the moon: a. your weight and mass would be less. b. your weight would be less but your mass would remain the same. c. your weight would remain the same, but your mass would be less. d. your weight would increase, but your mass would remain the same. 32. The relationship between the mass m of a material, its volume V, and its density D is a. V = md. c. DV = m. b. Vm = D. d. D + V = m. 33. Which statement about density is true? a. Two samples of a pure substance may have different densities. b. Density is a chemical property. c. Density is a physical property. d. The density of a sample depends on its location on Earth. 34. The density of aluminum is 2.70 g/cm 3. The volume of a solid piece of aluminum is 1.50 cm 3. Find its mass. a g c g b g d g 35. The density of sugar is 1.59 g/cm 3. The mass of a sample is 4.0 g. Find the volume of the sample. a. 2.5 cm 3 c cm 3 b cm 3 d. 2.5 g/cm 3

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