Nature of Science Review 7th

SC.7.N.1.2

Scientists frequently repeat the experiments of others scientists. Why is this important in science?

a. Scientists often ask each other for help in performing experiments.

b. Replication of experiments helps to confirm and verify results.

c. Scientists frequently perform other scientists’ experiments in order to practice their technique.

d. Repeating experiments is an effective way to make sure a laboratory is in optimal condition.

• a

• b

• c

• d

SC.7.N.1.2

Cara read an article on why repetition and replication are so important, but she did not understand the difference between them. Which of the following best explains the two terms?

a. Repetition is when a scientist repeats an experiment; replication is when a scientist conducts an experiment on genetic material.

b. Repetition is when a scientist does the same experiment a number of times; replication is when other scientists reproduce a scientist’s experiment.

c. Repetition is when a scientist publishes in more than one scientific periodical; replication is when another scientist reproduces another scientist’s results.

d. Repetition is when a scientist commits an error in an experiment the first time and must repeat it; replication is when a scientist repeats an experiment to make sure it is valid.

• a

• b

• c

• d

SC.6.N.1.2

Experiments are often repeated many times by the same or different scientists. What is the most important reason more than one scientist should conduct an investigation using the same methods?

a. If the results are the same, replication of the investigation helps to confirm the results.

b. The competition makes the scientists work more carefully.

c. More than one scientist is interested in the problem.

d. Different scientists might perform the experiment differently.

• a

• b

• c

• d

The variable that you may change in the experiment

• Independent Variable

• Dependent Variable

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Variable measured during the experiment

• Independent Variable

• Dependent Variable

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What is the relationship between dependent and independent variables?

• The independent variable changes based on the dependent variable

• The dependent variable changes based on the independent variable

• the are not related

• they are the same

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A scientific theory:

• Describes a natural phenomenon

• Explains a natural phenomeon

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A scientific law:

• Describes a natural phenomenon

• Explains a natural phenomenon

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Scientists create both scientific theories and scientific laws as they make observations and conduct experiments about the natural world. Which of the following statements most accurately compares the difference between scientific theories and scientific laws?

• Scientific laws are based on evidence, while scientific theories are not.

• Scientific theories involve only biology, while laws involve all types of science.

• Scientific theories involve mathematical equations, while scientific laws are based on observations.

• Scientific theories are ideas that explain natural events, while scientific laws more reliably predict natural events.

Which choice best explains why the scientific model of the atom has changed over time?

• The discovery of new evidence resulted in changes to the atomic theory.

• Advancements in atomic models proved the atomic theory was accurate.

• The atomic theory was modified with the discovery of a new element.

• Changes in atomic models show that the atomic theory was based on opinion.

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