U1:LT2 Parts of an Experiment

A possible explanation to a problem that has not yet been tested is called a (a)   .

• data
• fact
• hypothesis
• theory

Answer explanation

A hypothesis is what you think might happen in an experiment. Its an educated guess.

Match each experimental term with its correct definition.

• The variable in an experiment that is intentionally changed by the scientist.

• dependent variable

• The variable that is measured or observed in response to changes in the experiment.

• data

• Facts, figures, and other evidence gathered through observations.

• control group

• The group in an experiment that does not receive the experimental treatment and is used for comparison.

• independent variable

Answer explanation

DRY MIX

Dependent variable

Responding

Y-axis

Manipulated (changed by scientist)

Independent variable

X-axis

What step does every scientific experiment begin with?

• experiement procedure

• conclusion

• hypothesis

• question/problem

Answer explanation

PHEOCS

Problem -ask a question

Hypothesis - educated guess

Experiment - procedure

Observation - Data Collect

Conclusion - what did you learn

Share - explain findings

This part of the experiment serves as a basis of comparison; does not get the independent variable.

• experimental group

• control group

• data

• variables

Answer explanation

How does the amount of carrots affect jumping distance?

The kangaroo getting 0 carrots is the control group.

The summary at the end of an experiment that explains the results.

• materials

• dependent (responding) variable

• procedure

• conclusion

Tags

NGSS.MS-LS2-4

A student wants to test the effects of the type of exercise on heart rate. What is the dependent variable?

• amount of excercise

• time of day excercise occurs

• heart rate

• type of excercise

Answer explanation

Dependent (responding) variable is what is counted, measured or timed.

An experiment is performed on plants to see how different liquids affect plant growth. Each plant is given a different liquid; water, juice or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this experiment, the independent variable is (a)   .

• the type of music
• the type of liquid
• the amount of sunlight
• the type of plant

Answer explanation

An independent variable is what the scientist tests or changes.

Tags

NGSS.MS-LS2-1

An experiment is performed on plants to see how different liquids affect plant growth. Each plant is given a different liquid; water juice or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this experiment, what is the independent variable?

• Water, juice and milk

• plant growth

• type of plant, soil, amount of sunlight and music

• time of day

Answer explanation

Independent (manipulated) variables are selected by the scientist for testing.

The scientist is trying to see how different liquids affect plant growth.

Tags

NGSS.MS-LS2-1

Match each scientific term with its correct description.

• Statements drawn from analyzing results

• conclusions

• Observations made during an experiment

• problem

• Question to be solved in an experiment

• data

Tags

NGSS.MS-PS1-2

NGSS.MS-PS2-5

An experiment is performed on plants to see how different liquids affect plant growth. Each plant is given a different liquid; water juice or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this experiment, the constants are (a)   .

• water, juice, milk
• type of plant, amount of soil/sun
• plant growth
• time of day

Answer explanation

Constants are part of the experiment meant to keep the experiment fair.

Each situation has the same plant, same amount of water, same amount of soil, etc...