7.3 Radioactivity and Half Life TEST
Authored by Joel Harms
Chemistry
9th Grade
NGSS covered
Used 1+ times
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28 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the definition of half-life?
The time taken for half of the radioactive nuclei in a sample to decay.
The time taken for a substance to completely disappear.
The time taken for a chemical reaction to start.
The time taken for a gas to be released from a syringe.
Tags
NGSS.HS-PS1-8
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a factor that affects half-life?
Temperature
Color
Shape
Size
Tags
NGSS.HS-PS1-8
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you calculate the amount of radioactive material remaining after a given number of half-lives?
Multiply the initial amount by 2.
Divide the initial amount by 2 for each half-life.
Add the initial amount to the number of half-lives.
Subtract the number of half-lives from the initial amount.
Tags
NGSS.HS-PS1-8
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is an isotope?
A type of gas syringe.
A variant of a chemical element with a different number of neutrons.
A controlled variable in an experiment.
A type of precipitate.
Tags
NGSS.HS-PS1-8
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a controlled variable?
A variable that is changed in an experiment.
A variable that is kept constant in an experiment.
A variable that is measured in an experiment.
A variable that is ignored in an experiment.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a precipitate?
A solid formed from a solution during a chemical reaction.
A liquid that evaporates quickly.
A gas that is released from a reaction.
A type of isotope.
Tags
NGSS.MS-PS1-2
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to the atoms of a radioisotope when it decays?
All atoms change instantaneously into another element.
None of the atoms change into another element.
Some atoms change into another element over time.
All atoms remain the same.
Tags
NGSS.HS-PS1-8
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