Lab Experiment Essentials: Understanding Variables and Equipment

1. The Mad Scientist Parts of Parts Whats That Mean Laboratory Confusion Measure This 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500

2. Changed part of the experiment

3. Changed part of the experiment What is the independent variable?

4. Needed to keep all parts of the experiment equal

5. Needed to keep all parts of the experiment equal What are control variables?

6. Occurs because of the change in an experiment and can be measured

7. Occurs because of the change in an experiment and can be measured What is the dependent variable?

8. Statement about the outcome of the experiment; If (this is changed) then, (this will occur).

9. Statement about the outcome of the experiment; If (this is changed) then, (this will occur). What is a hypothesis?

10. Gathered during the experiment and then analyzed to see if it supports your hypothesis or not

11. Gathered during the experiment and then analyzed to see if it supports your hypothesis or not Data

12. Piece of equipment you would use to measure exactly 17 mL of liquid

13. Piece of equipment you would use to measure exactly 17 mL of liquid What is a graduated cylinder?

14. What piece of equipment would you use to measure 1.7 mL of a liquid?

15. What piece of equipment would you use to measure 1.7 mL of a liquid? pipette

16. A student is about to perform an experiment which uses potassium cyanide, which can be poisonous if ingested. Which safety symbol is most relevant to this investigation?

17. Poison

18. Piece of equipment used to measure mass

19. Piece of equipment used to measure mass What is the triple-beam balance?

20. When an accident occurs in the lab how soon do you inform the teacher?

21. When an accident occurs in the lab how soon do you inform the teacher? Immediately

22. Jen wanted to determine if using filtered water would increase the growth of her fern plants. She gave 2 of her fern plants 250 mL of filtered water and the other 2 250 mL of tap water for one month. Each day she counted the number of fronds on each plant.What was the dependent variable?

23. Jen wanted to determine if using filtered water would increase the growth of her fern plants. She gave 2 of her fern plants 250 mL of filtered water and the other 2 250 mL of tap water for one month. Each day she counted the number of fronds on each plant.What was the dependent variable?Number of fronds

24. A botanist testing the affects of a chemical on apple yield sprays an orchard with the chemical. A second orchard does not receive the chemical. In the fall, the number of apples harvested from each orchard is counted. What is the control group?

25. A botanist testing the affects of a chemical on apple yield sprays an orchard with the chemical. A second orchard does not receive the chemical. In the fall, the number of apples harvested from each orchard is counted. What is the control group? Orchard with no chemical

26. Richard wants to test the effectiveness of red chili powder on deterring caterpillars from eating his tomato plants. Twenty tomato plants from the same package of seed are planted in the same garden. When mature he dusts only half of them with red chili powder every week for the entire growing season. Every day he counts the number of caterpillars on all the plants and records these numbers in a data table. What is the independent variable in Richards experiment?

27. Richard wants to test the effectiveness of red chili powder on deterring caterpillars from eating his tomato plants. Twenty tomato plants from the same package of seed are planted in the same garden. When mature he dusts only half of them with red chili powder every week for the entire growing season. Every day he counts the number of caterpillars on all the plants and records these numbers in a data table. What is the independent variable in Richards experiment? Chili powder

28. A scientist testing the affects of a chemical on apple yield sprays an orchard with the chemical. A second orchard does not receive the chemical. In the fall, the number of apples harvested from each orchard is counted. The orchard sprayed with the chemical yields an average of 60 apples per tree, the other orchard yields an average of 40 apples per tree. Based on the data, what can the scientist conclude about the use of the chemical?

29. A scientist testing the affects of a chemical on apple yield sprays an orchard with the chemical. A second orchard does not receive the chemical. In the fall, the number of apples harvested from each orchard is counted. The orchard sprayed with the chemical yields an average of 60 apples per tree, the other orchard yields an average of 40 apples per tree. Based on the data, what can the scientist conclude about the use of the chemical?It increased the yield of apples

30. A fly fisherman wanted to know if rainbow trout preferred flies tied with synthetic fibers or deer fur. He tied ten wollybear flies, half with synthetic fibers and half with deer fur. He fished the same section of a stream for four hours every Saturday for two months. He used each fly type for half of each day and tallied the number of rainbow trout caught on each. Identify the independent and dependent variables.

31. A fly fisherman wanted to know if rainbow trout preferred flies tied with synthetic fibers or deer fur. He tied ten wollybear flies, half with synthetic fibers and half with deer fur. He fished the same section of a stream for four hours every Saturday for two months. He used each fly type for half of each day and tallied the number of rainbow trout caught on each. I.V.= type of fiber fly tied with D.V. = number of fish caught on each type of fly

32. A fly fisherman wanted to know if rainbow trout preferred flies tied with synthetic fibers or deer fur. He tied ten wollybear flies, half with synthetic fibers and half with deer fur. He fished the same section of a stream for four hours every Saturday for two months. He used each fly type for half of each day and tallied the number of rainbow trout caught on each. Write a testable hypothesis for this experiment.

33. A fly fisherman wanted to know if rainbow trout preferred flies tied with synthetic fibers or deer fur. He tied ten wollybear flies, half with synthetic fibers and half with deer fur. He fished the same section of a stream for four hours every Saturday for two months. He used each fly type for half of each day and tallied the number of rainbow trout caught on each. If (fiber type) then, (number of fish caught).

34. Jen wanted to determine if using filtered water would increase the growth of her fern plants. She gave 2 of her fern plants 250 mL of filtered water and the other 2 250 mL of tap water for one month. Each day she counted the number of fronds on each plant. Write a testable hypothesis for this experiment.

35. Jen wanted to determine if using filtered water would increase the growth of her fern plants. She gave 2 of her fern plants 250 mL of filtered water and the other 2 250 mL of tap water for one month. Each day she counted the number of fronds on each plant. If (water type) then, (number of fronds).

36. A botanist was studying the effect of sunlight on the rate of photosynthesis. She placed ten radish plants in controlled areas and varied the amount of sunlight each one received. Over the next 5 days she measured the amount of oxygen each plant produced.What was the independent variable?What was the dependent variable?

37. A botanist was studying the effect of sunlight on the rate of photosynthesis. She placed ten radish plants in controlled areas and varied the amount of sunlight each one received. Over the next 5 days she measured the amount of oxygen each plant produced.What was the independent variable? Amount of sunlight What was the dependent variable? Amount of oxygen produced

38. Susan wanted to study the effects of food amounts on the reproduction rates of guppies. She set up 10 fish tanks each with 15 guppies. In each tank she varied the amount of food given to the guppies. Throughout the year she recorded the number of guppies successfully born in each tank and at the end of the year she graphed her data. Label the axis’ of a graph

40. At what time is the most water being absorbed by the roots?

41. 6 pm

42. Base unit for measuring length or distance

43. Base unit for measuring length or distance What is the meter?

44. Base unit for measuring volume

45. Base unit for measuring volume What is the liter?

46. Base unit for measuring mass

47. Base unit for measuring mass gram

48. What would be the most appropriate unit to measure the distance across the diameter of a hair?

49. What would be the most appropriate unit to measure the distance across the diameter of a hair? micrometer

50. What would be the most appropriate unit to measure the amount of liquid in a rain drop?