7A MP 1 Exam1.Safety: Write down 2 safety procedures

to follow in the laboratory.• Point test away from yourself and

everyone else.• Wear goggles to protect your eyes.• Do not start a lab unless instructed

to do so by the teacher.• Do not eat or drink anything during

a lab.

2. List the 7 steps of the scientific method: •Problem, gather information, hypothesis, experiment, observation, conclusion, repeat

3. What is a hypothesis? •An educated guess4. Which step of the scientific method tests the hypothesis? •Experiment5. Which step of the scientific method organizes and analyzes data?•Observations

6. Define: a. Independent Variable:•The factor that is different in each setup•b. Dependent Variable:•What is being measured

7. Students wanted to investigate the effect of vinegar on seed growth. In order to test their idea they set up two identical containers filled with soil. In each container they planted 100 bean seeds. Both containers were placed in the sunlight for 8 hours a day. Container A was given 50 ml of water daily and container B was given 50 ml of vinegar. The seed growth was measured weekly.

a. Independent Variable:• Vinegarb. Dependent Variable:• Seed growthc. Control Group:• Container Ad. Experimental Group:• Container Be. 2 constants:• Type of seeds, temperature, light, location, containersf. How can you increase the validity of this experiment?• Repeat, increase sample size

8. Metric Conversions: •K H D U D C M a. 1.27 g = _______ mg •1270 mgb. 5008.9 cm = ______km •0.050089 km

9. Identify the metric unit(s) and instrument used to measure:a. Length: meter rulerb. Mass: gram triple beam balancec. Volume: liter/cm3 graduated cylinder/ruler

10. What length is being represented at the arrow in the diagram below?

•1.7 cm

11. What is the length of the object below?

8.9 cm

12. Calculate the volume of an object with the following dimensions: •L = 3.5 cm, W = 4.7 cm, H = 8.3 cm• Show all work!•V = L x W x H•V = 3.5 cm x 4.7 cm x 8.3 cm•V = 136.5 cm3

13. What is the volume of the liquid in the graduated cylinder below?

•30 mL

14. What is the mass on the triple beam balance below?

•545.2 g

15. What are the temperatures shown below?

•100ºF•38ºC

16. The volume of water in a graduated cylinder is 45ml. 6 marbles are placed into the graduated cylinder and the volume of the water is now 49ml. What is the volume of the marbles?

•49-45•4 mL

17. What is the boiling point of water? (F & C)•100°C, 212°F18. What is the melting point of ice? (F & C)• 0°C, 32°F

19. What is the density of an object that has a mass of 67.98 g and a volume of 134 mL? Show all work!

•D = m = 67.98g = 0.5 g/mL v 134 mLa. Will this object float or sink in water? Why?•It will float because it less dense than water.b. If this object is cut in half what will the density of each half be? •The same (0.5 g/mL)

Microscope: 20. What is the function of the microscope?•It magnifies a specimen using lenses.21. Define the following parts.a. Diaphragm: •controls the amount of light in a microscopeb. Coarse adjustment knob: •larger knob, for focusing when using low power objectivec. Fine adjustment knob:•Smaller knob, for focusing when using high power objective

22. Why can’t you use the coarse adjustment knob under high power?•The lens and/or slide can break. 23.. How does the image look under the microscope? •Upside down and backwards24. How do you move the slide if you want the image to move to the left and down? •Right and up

25. What is used to make the image more visible under the microscope?•Stain 26. What happens to the field of view when switching from the low to high power objective?•It decreases.

27. Microscope measurement: a. 2 mm = ________um •2000 um b. 5000 um = _______mm•5 mm

28. What is the diameter (in millimeters) of each field of view below?

a. b. c.

4 mm

4 mm

4.5 mm

28. What is the length of the cell in the field of view below. The diameter is 4mm.

1 mm

29. Graphing:•A glucose-tolerance test was conducted to observe the effect of time on glucose concentration in the blood. An animal was fed 10 ml of glucose solution. At five different times after the drinking of the solution, the blood glucose concentration was measured, and the results were recorded in the data table shown.•Add appropriate scales and labels to the graph, plot the data, and draw a line graph. Use the data and graph to answer the following questions.

Time AfterGlucose Ingestion (min)

Glucose ConcentrationIn Blood (mg/100dL)

0 7530 12560 11090 90120 80180 70

Time After Glucose Ingestion (min)

Glucose Conc. In blood (mg/100dL)

30 60 90 120 150 180

20

40

60

80

100

120

140

160

180

200

a. Based on your graph, what was the glucose concentration at 70 minutes?

About 100 mg/100dL