Energy Unit Test

The nucleus of a large atom splits and two smaller atoms are formed. Energy is released in the process. What is the name of this process?

• Fusion

• Fission

• Friction

• Binary Multiplication

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NGSS.HS-PS1-8

Starting with 100 grams of uranium-238, after one half life has gone by, how many grams of uranium-238 will remain?

• 12.5 grams

• 25 grams

• 50 grams

• 100 grams

What is one way in which fission differs from fusion?

• Fission splits nuclei, fusion combines nuclei.

• Fission releases energy, fusion absorbs energy.

• Fission is not a radioactive process, fusion is radioactive.

• Fission deals with the nucleus, fusion pertains to the electrons.

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NGSS.HS-PS1-8

The chart seen here shows the decay of a sample of

carbon-14 over a period of 33,000 years. What is the approximate half-life of carbon 14?

• 5,500 years

• 11,000 years

• 16,500 years

• 33,000 years

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NGSS.HS-PS1-8

Large amounts of energy are required to join two atom's nuclei into a single nucleus and, in turn, create a new element. What is the name of the process where two nuclei join to create a new element?

• combining

• elementium

• fission

• fusion

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NGSS.HS-PS1-8

Which of these reactions is responsible for energy radiating from stars, including the Sun?

• nuclear fusion

• nuclear fission

• an exothermic chemical reaction

• an endothermic chemical reaction

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NGSS.HS-PS1-8

NGSS.HS-ESS1-1

An important aspect of fission reactions is that they produce _______________ which allow for chain reactions.

• Electrons

• Neutrons

• Protons

• Quarks

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NGSS.HS-PS1-8

Without the sun, life on earth would not exist. There would be no warmth, no plants, no animals, no night and day. To power itself, the sun is constantly generating a nuclear reaction in its core, in which hydrogen nuclei are combined to form helium. This process is known as fusion, and __________ a massive amount of energy.

• absorbs

• Divides

• Reflects

• Releases

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NGSS.HS-ESS1-1

Americium-241 is a radioactive substance used in smoke detectors. The half life of americium is 432 years. If a smoke detector initially contains 1 gram of Americium 241, how much will remain in 432 years?

• 0.5g

• 1.0g

• 1.5g

• 2.0g

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NGSS.HS-PS1-8

Barium-131 is a radioactive isotope of the element barium used for gastrointestinal tract scans in doctors offices. Barium-131 has a half-life of 10 days. If a patient drinks 2 grams of barium-131 how much of the isotope will be left after 10 days?

• 0.125grams

• 0.25grams

• 0.5grams

• 1 gram

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NGSS.HS-PS1-8