Unit Test

Question 1

The number of half-lives changes. This is the variable.

Revolt · Accepted Answer

independent

Question 2

The number of radioactive atoms changes due to the number of half-lives. The number of radioactive atoms is therefore the variable.

Revolt · Accepted Answer

dependent

Question 3

Write a hypothesis about how the number of half-lives affects the number of radioactive atoms. Use the "if . . . then . . . because . . ." format and be sure to answer the lesson question: "How does the number of radioactive atoms change over time?"

Revolt · Accepted Answer

Write a hypothesis about how the number of halflives affects the number of radioactive atoms. Use the if . . . then . . . because . . . format and be sure to answer the lesson question: How does the number of radioactive atoms change over time?

Question 4

Review data tables A–B in your Student Guide. Did you record all data throughout the virtual lab experiment?

Revolt · Accepted Answer

yes

Question 5

What did you include in your hypothesis? Check all that apply.

Revolt · Accepted Answer

The "if" part of the hypothesis refers to the number of half-lives.; The "then" part of the hypothesis refers to a change in the number of radioactive atoms.; The "because" part of the hypothesis connects half-life to the rate of decay of the atoms.

Unit Test Answers

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