Final Review Units 7-8

How did the bits of dust and gas that eventually formed the solar system behave while falling into orbit around each other?

• They collided and went spiraling in opposite directions.

• They expanded as they were pulled farther apart and eventually cooled.

• They created new gases that caused them to cool after interacting with each other.

• They ran into each other and stuck together due to gravitational and other forces.

Answer explanation

This question links to success criteria: I can describe how the sun and planets formed due to accretion and gravity.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Our solar system contains how many stars

• Hundreds, thousands, or maybe even millions.

• Eight.

• None

• One

Answer explanation

This question links to success criteria: I can describe how the sun and planets formed due to accretion and gravity.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

As the solar system continued to evolve, material in the disk collided with other material and grew into planetesimals, then protoplanets, and then planets. This process of growth by collision created a lot of heat, melting the early Earth. Growth by collision is called ___.

• differentiation

• accretion

• adsorption

• kinetic molecular theory

Answer explanation

An atom of an element with a different number of neutrons and therefore a different atomic mass

• Isotope

• Ion

• Atom

• Particle

The element that is the product of radioactive decay is known as the...

• daughter element

• half-life

• parent element

• carbon-14

Answer explanation

This question links to success criteria: I can differentiate between a parent and daughter isotope in a radioactive decay process.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark

Tags

NGSS.HS-PS1-8

The original element that undergoes radioactive decay is known as the...

• daughter element

• half-life

• parent element

• radioactive decay

Answer explanation

This question links to success criteria: I can differentiate between a parent and daughter isotope in a radioactive decay process.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark

Tags

NGSS.HS-PS1-8

How many half-lives have passed if there 6.25% parent isotope left?

• 1 half-life

• 2 half-lives

• 3 half-lives

• 4 half-lives

Answer explanation

This question links to success criteria: I can relate radioactive half-life to how long a substance has been decaying radioactively and how much substance remains.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark

A sample of wood that originally contained 100 grams of carbon-14 now contains only 12.5 grams of carbon-14. If the half life of Carbon-14 is 5700 years, approximately how many years ago was this sample part of a living tree?

• 2,850 years

• 5,700 years

• 11,400 years

• 17,100 years

Answer explanation

This question links to success criteria: I can relate radioactive half-life to how long a substance has been decaying radioactively and how much substance remains.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark

Tags

NGSS.HS-PS1-8

Which of the following reasons explains why scientists cannot use Carbon-14 to date the bones in this dinosaur fossil?

• Carbon-14 has a short half-life so it is only useful to date recent things.

• Dinosaur bones do not contain carbon or carbon-14

• Dinosaurs were not radioactive because they never invented nuclear power plants

• Scientists have not yet calculated the half-life of carbon-14

Answer explanation

This question links to success criteria: I can use appropriate radioactive isotopes to determine the absolute ages of rocks and organic objects. 

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark

Tags

NGSS.HS-PS1-8

Match the following radioactive isotopes to the time-frames they can be used to accurately measure.

• Accurate up to 3-4 billion years

• Uranium-235

• Accurate beyond 4 billion years

• Carbon-14

• Accurate up to 500,000 years

• Uranium-234

• Accurate up to 50,000 years

• Potassium-40

Answer explanation

This question links to success criteria: I can use appropriate radioactive isotopes to determine the absolute ages of rocks and organic objects. 

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark

Tags

NGSS.HS-PS1-8