1. Scientific Method Unit Test Review WS Answers

2. Scientific Method Unit Test Review
Question #1: 8 parts of the scientific method process in order:
1. ask a question or identify the scientific problem
2. make observations/conduct research
3. write a hypothesis 4. write a procedure 5. carry out the experiment 6. collect and organize data 7. analyze data 8. draw conclusions

3. Scientific Method Unit Test Review
2. Use your own words to define the following words:
variable – any part of an experiment that changes
control – an experimental group that is used as a standard to compare results to
independent variable – a variable that you change ON PURPOSE
dependent variable – a variable that changes that you MEASURE hypothesis - constant – a variable that does NOT change/MUST stay the same/NOT allowed to change

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3. On which axis on a graph do you put the dependent variable? Y-axis

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4. At the end of an experiment what does a scientist form? Conclusions

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5. Which part of the scientific method process is most likely to follow hypothesizing? Write a procedure

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6. What is the role of a control in an experiment? Serves as a standard so you can compare your results to it

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7. What is the name of the recorded measurements taken during an experiment? data

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8. If the amount of lighting is increased across a fish tank, then more brine shrimp will be found in the area where the light is the brightest. The dependent variable is the… the number of brine shrimp

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9. If mice are given food pellets high in salt content, then the mice should have an increase in urine output. Identify at least two constants in this experiment.
mice of same gender, age, and species.
same amount of food pellets given to all mice

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10. On which axis of a graph do you put the independent variable? X axis

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11. On which axis of a graph do you put the dependent variable? Y axis

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12. What is name of the question to be solved in an experiment? scientific problem

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13. What is the name of a statement that can be tested? Hypothesis

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14. What is the “factor” a scientist changes during a controlled experiment? In other words what is the variable called that he is testing? independent variable

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15. What is the format of a hypothesis? If D.V. is related to I.V., then specific prediction as the I.V. increases/decreases the DV increases/decreases.

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16. What are the characteristics of a hypothesis? In other words, what must a hypothesis include? If, is related to, then

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17. Which variable do you change on purpose? independent variable

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18. Which variable do you measure? dependent variable

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19. In a data table, which column (left or right) do you record the dependent variable? right column

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20. In a data table, which column (left or right) do you record the independent variable? left column

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21. The act of drawing a solution from the information found in an experiment is making a __________________. conclusion

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22. In an experiment, the variable that changes as a result of changes in the manipulated variable is the… dependent variable

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23. In an experiment, a scientist is studying how long it takes parachutes of different sizes to fall to the ground. What is the independent variable? size of parachute

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24. You want to know if the temperature of water affects how quickly a cube of sugar will dissolve. What would be the dependent variable? time it takes sugar cube to dissolve

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25. On which axis on a graph do you put the independent variable? X axis

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26. What is the most appropriate problem for this experiment? (a) How do plants and animals get along in pond water? (b) What type of gasses do different organisms give off as a waste product? (c) Which pond water changes color? (d) What causes the water to turn color?

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27. Write a Hypothesis for this experiment. If the color change of Bromthymol blue is related to the presence of carbon dioxide, then as the amount of carbon dioxide increases the bromthymol blue becomes more green.

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28. Highlight the sentences in the experiment which describe the procedure. Four Flasks were filled with pond water. Five drops of Bromthymol blue were added to each flask. Bromthymol blue turns green in the presence of carbon dioxide. A snail was placed in flask 2. A piece of Elodea, a plant, was placed in flask 3. Both a snail and a piece of Elodea were placed in flask 4. All four flasks were sealed with paraffin wax and placed in the light for 2 days. At the end of two days, the water in flask 2 was green. The water in flask 3 was blue. The water in flask 4 was blue at the top and green at the bottom.

30. Scientific Method Unit Test Review
28. Highlight the sentences in the experiment which describe the procedure. Four Flasks were filled with pond water. Five drops of Bromthymol blue were added to each flask. Bromthymol blue turns green in the presence of carbon dioxide. A snail was placed in flask 2. A piece of Elodea, a plant, was placed in flask 3. Both a snail and a piece of Elodea were placed in flask 4. All four flasks were sealed with paraffin wax and placed in the light for 2 days. At the end of two days, the water in flask 2 was green. The water in flask 3 was blue. The water in flask 4 was blue at the top and green at the bottom.

31. Scientific Method Unit Test Review
29. Underline the sentences in the experiment that contain observations. Four Flasks were filled with pond water. Five drops of Bromthymol blue were added to each flask. Bromthymol blue turns green in the presence of carbon dioxide. A snail was placed in flask 2. A piece of Elodea, a plant, was placed in flask 3. Both a snail and a piece of Elodea were placed in flask 4. All four flasks were sealed with paraffin wax and placed in the light for 2 days. At the end of two days, the water in flask 2 was green. The water in flask 3 was blue. The water in flask 4 was blue at the top and green at the bottom.

32. Scientific Method Unit Test Review
29. Underline the sentences in the experiment that contain observations. Four Flasks were filled with pond water. Five drops of Bromthymol blue were added to each flask. Bromthymol blue turns green in the presence of carbon dioxide. A snail was placed in flask 2. A piece of Elodea, a plant, was placed in flask 3. Both a snail and a piece of Elodea were placed in flask 4. All four flasks were sealed with paraffin wax and placed in the light for 2 days. At the end of two days, the water in flask 2 was green. The water in flask 3 was blue. The water in flask 4 was blue at the top and green at the bottom.

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30. What purpose does Flask 1 have in the experiment? Control

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31. What is the independent variable in this experiment? What is placed in each flask: the snail, the Elodea plant, the snail and the Elodea plant

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32. What is the dependent variable in this experiment? The color change of the pond water

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33. Name 6 constants in this experiment.
Size of flask
Kind of flask (same shape)
Pond water taken from the same pond at the same time
same brand of Bromthymol blue
same type of paraffin wax
same gender/species/size of snail
same size piece of Elodea plant.

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34. Write a conclusion for this experiment. Make sure your conclusion contains everything a conclusion is supposed to have.

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I put pond water in four flasks, and added 5 drops of Bromthymol blue. Then I put a snail, a piece of Elodea, and a snail and a piece of Elodea in 3 of the flasks. I sealed all 4 flasks with wax. My hypothesis was if the color change of Bromthymol blue is related to the presence of carbon dioxide, then as the amount of carbon dioxide increases the bromthymol blue becomes more green. My hypothesis was supported.

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If I repeated this experiment, I would use a fish and a different kind of water plant. I learned that even animals that live in water “exhale” oxygen and plants that live in water “exhale” carbon dioxide, just like land animals and plants.