U2L4

What is nuclear fusion?

• The splitting of a heavy nucleus into lighter nuclei

• The combining of light atomic nuclei to form a heavier nucleus

• The process of electrons joining protons

• The decay of radioactive elements

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NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

NGSS.HS-PS1-8

Where does nuclear fusion naturally occur?

• In the Earth's core

• In stars

• In the ocean

• In volcanoes

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NGSS.HS-ESS1-1

What is the main fuel for nuclear fusion in all stars?

• Helium

• Hydrogen

• Carbon

• Oxygen

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NGSS.HS-ESS1-1

Which of the following best describes "light elements"?

• Elements with a high atomic number

• Elements with a low atomic number

• Elements that are gases at room temperature

• Elements that are metals

Which three elements are considered the “light elements” in the context of nuclear fusion?

• Hydrogen, Helium, Lithium

• Carbon, Oxygen, Nitrogen

• Iron, Nickel, Cobalt

• Uranium, Plutonium, Thorium

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NGSS.HS-PS1-8

What are "heavy elements"?

• Elements with a low atomic number

• Elements with a high atomic number

• Elements that are gases

• Elements that are liquids

What is the heaviest element that can be made by fusion in large stars before a supernova?

• Iron

• Gold

• Uranium

• Lead

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NGSS.HS-ESS1-1

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Which of the following best explains why hydrogen is the main fuel for nuclear fusion in stars?

• It is the heaviest element

• It is the most abundant element in stars

• It is a metal

• It is radioactive

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NGSS.HS-ESS1-1

Explain why elements heavier than iron are not formed by regular fusion in stars.

• Because they are too light

• Because fusion of heavier elements requires more energy than it releases

• Because they are gases

• Because they are unstable

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NGSS.HS-PS1-8

Fusion converts hydrogen into

• uranium

• helium

• plutonium

• radon

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NGSS.HS-ESS1-3

NGSS.HS-PS1-8