Nature of Science 7th

Which statement describes how a scientist makes scientific explanations?

• A scientist bases scientific explanations on a large body of observations of the world.

• A scientist bases scientific explanations only on other scientists’ opinions.

  
  

• A scientist suggests scientific explanations and makes up evidence to make them true.

• A scientist bases scientific explanations on personal experience and opinions.

  
  

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NGSS.HS-LS4-1

NGSS.HS-PS1-2

NGSS.HS-PS2-5

Which description defines a dependent variable in a scientific experiment?

• Any factor that is controlled during an experiment.

  
  

• Any factor that is measured to gather results

  
  

• Any factor that is changed so that it can be tested

• Any factor that changes during an experiment

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NGSS.MS-PS2-2

What is the correct term for this diagram?

• experiment

• observation

• visual model

• mathematical model

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NGSS.MS-PS1-1

A group of students measures the mass and volume of an object to calculate its density.

Which procedure increases the accuracy and validity of the group’s data?

• repeating the experiment and analyzing all the data

• having group members individually calculate density

• changing the procedure to check whether the results are constant

• varying the equipment used to check whether the results are constant

On which day was there the least difference between the low temperature and high

temperature?

• Monday

• Tuesday

• Thursday

• Friday

Which description defines an experiment?

• prediction of something that will happen

• observation of results from uncontrolled events

• development of a testable explanation of an event

• procedure applied systematically under controlled conditions

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NGSS.MS-PS2-2

NGSS.MS-ETS1-4

Which of these statements about atomic models is most likely correct?

• The atomic model has not changed over time.

• As scientists learned more, they modified the atomic model.

• Scientists are still debating which of the three theories is right.

• Scientists think real atoms look like a combination of the three different models

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NGSS.MS-PS1-1

This equation represents what type of model?

• physical model

• computer model

• conceptual model

• mathematical model

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NGSS.MS-LS1-6

NGSS.MS-LS1-7