unit 1 review. what is a control group? you don’t have to have one in every experiment a control...

Unit 1 Review

What is a control group?

• You don’t have to have one in every experiment• A control group is a group separated from the rest

of the experiment • The independent variable being tested cannot

influence the results. • This isolates the independent variable's effects on

the experiment and can help rule out alternate explanations of the experimental results.

• Experiments that use control groups are called controlled experiments.

Example

Experimental Question: “How does the addition of fertilizer to plant soil affect plant growth?”

Design Experiment: Test two plants. One receives fertilizer and the other does not. Compare results

Which is your control group?= the plant that does not receive the fertilizer

• Experimental Question: “How does the addition of fertilizer to plant soil affect plant growth?”

• Independent variable?• Dependent variable?• Constants?• Hypothesis?

Example

• Experimental Question: “How does the presence of music affect plant growth?”

• Design Experiment:??

• Control group??

• Experimental Question: “How does the presence of music affect plant growth?”

• Independent variable?• Dependent variable?• Constants?• Hypothesis?

A study was conducted to test which fertilizer (A,B, or C) is most effective for the growth of St. Augustine’s grass over a 6 week time period. The following data was collected from the study:

Numbered Plot of Grass

Treatment Applied Average of INITIAL Height of Grass (cm(=)

Average of FINAL Height of Grass (cm)

1 Water 2.4 3.0

2 Fertilizer A 2.4 4.0

3 Fertilizer B 2.4 2.6

4 Fertilizer C 2.4 2.9

1.) What is not a constant in this experiment? (factor that is kept the same) 2.) Why did the experimenters include one plot with water treatment? What is this group called?3.) What is a quantitative measurement? What is quantitatively measured in this experiment?

Review

Ex: Who is the principal of Glasgow High School?

A. Ms. LynchB. Mr. HaleC. Mr. VaughtD. Mrs. Wilson

Ex: Who is the principal of Glasgow High School?

A.Mrs. LynchB. Mr. HaleC. Mr. VaughtD.Mrs. Wilson

1. Which of the following must be written so that it is testable?

A.Scientific theoryB. Scientific lawC. HypothesisD.All of the above

2. What should you do if you are working with a 100 mL beaker and you notice a small crack?

A. Keep working, the crack isn’t big enough for liquid to seep throughB. Hurry up and finish before the crack gets largerC. Immediately report the crack to the teacher and wait for further instructionD. Borrow a 100mL beaker from the group sitting work next to you

2. What should you do if you are working with a 100 mL beaker and you notice a small crack?A. Keep working, the crack isn’t big enough for liquid to seep throughB. Hurry up and finish before the crack gets largerC. Immediately report the crack to the teacher and wait for further instructionD. Borrow a 100mL beaker from the group sitting work next to you

3. Which of the following is known as an “educated guess”?

A. ConclusionB. HypothesisC. A LawD. A theory

4. Which direction should a test tube be facing when heating over an open flame?

A. Slightly tilted pointing towards youB. Slightly tilted pointing away from

youC. Perfectly in the upright positionD. It doesn’t matter

5. Define the term “scientific law”

a. A possible explanation to a scientific questionb. An explanation that has been well tested and

unifies a broad range of observationsc. An explanation for why certain things exist

that can be tested to determine its accuracy.d. Generalizes a body of observations, typically

math related.

6. How are theories developed?

a. By making observations with the five senses

b. By thinking of one scientific hypothesis

c. Through scientific predictionsd. Through many consistent and

supportable tests

7. Identify the statement below that is an observation

a. Due to overfishing, extinctions in the ocean are on the rise

b. If a young caterpillar is fed a diet high in milkweed, then predators will avoid it as an adult

c. Gardenia bushes are very fragrantd. How fast can a cheetah run

8. Which of the following is sometimes called the manipulated variable?

a. Independent variableb. Dependent variablec. Control variabled. Experimental variable

9. Which of the following is sometimes called the responding variable?

a. The independent variableb. The dependent variablec. The control variabled. The experimental variable

10. Which of the following is the group that the experimental group will be tested against?

a. The responding variableb. The experimental groupc. The control groupd. The constant group

11. Kimmy observes goldfish in an outdoor pond. The goldfish seem to be more active when the weather is warm than when it is cold. She asks herself, “How do temperature changes affect goldfish?

Task: Discuss the scenerio with your group and create a hypothesis for Kimmy

11. Kimmy observes goldfish in an outdoor pond. The goldfish seem to be more active when the weather is warm than when it is cold. She asks herself, “How do temperature changes affect goldfish?

Possible hypothesis: “If the temperature increases, then goldfish activity will increase.”

OR “If temperatures decrease, then goldfish activity will decrease.”

12. Which of the following phrases contains quantitative data?

a. Green leaves surround white flowersb. Ricky’s football jersey is number 85c. Seeds sprout more quickly when it is

warmd. Water evaporates at a rate of 2 mL per

minute

13. What type of information does an MSDS sheet not give you?

a. Chemical structureb. Chemical propertiesc. Personal safetyd. Fair market value

14. In class Kelly placed her pencil on the triple beam balance. What can you infer about this?

a. She wanted to find the volume of the pencil

b. She wanted to find the mass of the pencil

c. She wanted to find the length of the pencil

d. All of the above

15. Convert 68°F to Celsius

C= (F-32) F=1.8(°C) +32 1.8

C = K – 273.15 K=C+273.15

15. Convert 68°F to Celsius

C= (F-32) F=1.8(°C) +32 1.8

C = K – 273.15 K=C+273.15

= 20°C

16. Convert 18°C to °F

C= (F-32) F=1.8(°C) +32 1.8

C = K – 273.15 K=C+273.15

16. Convert 18°C to °F

C= (F-32) F=1.8(°C) +32 1.8

C = K – 273.15 K=C+273.15

= 64.4°F

17. Convert 100K to °C

C= (F-32) F=1.8(°C) +32 1.8

C = K – 273.15 K=C+273.15

17. Convert 100K to °C

C= (F-32) F=1.8(°C) +32 1.8

C = K – 273.15 K=C+273.15

= -173.15

18. Graduated cylinders are marked in units of

a. litersb. metersc. millimetersd. milliliters

19. A runner eats a large pasta dinner the night before a race. In this example, which characteristic of life is the runner using to help her win the race?

a. All living things have cellsb. All living things reproduce and display

heredityc. All living things evolve and adaptd. All living things obtain and use energy

20. Which of the following is a way that organisms maintain homeostasis?

a. A damaged skin cell dividing into two newer skin cells

b. A human shivering in the cold weatherc. A crow learning to retrieve a food reward in a

lab experimentd. Finishes in the Galapagos developing different

types of beaks

21. Which of the following is not a characteristic of life?

a. Reproduce and display heredityb. Respond to stimulic. Maintain homeostasisd. Are multicellular

22. According to the graph, what is the height of Plant A at 21 days?

a.5 cmb.9cmc.11 cmd.11 ft

23. Identify the lab equipment below


Wash Bottles


Striker


Micropipette *Can measure liquids less than 1 mL

26. What piece of lab equipment would you use to measure 10 g of NaCl?

26. What piece of lab equipment would you use to measure 10 g of NaCl?

Triple Beam Balance

Balance

unit 1 review. what is a control group? you don’t have to have one in every experiment a control...

Documents

fertilizer slide

theory slide

wilson slide

review slide

addition of fertilizer

growth of

small crack

hypothesis c