6a. Quiz

What elements formed from the Big Bang?

• Hydrogen

• Carbon and oxygen

• Nitrogen, helium and boron

• Helium and hydrogen

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Why do nebulae form?

• Nuclear fusion heats less dense regions of carbon and oxygen

• Gravity condenses dense regions of hydrogen and helium

• They form from the nuclear decay of hydrogen and helium

• Gravity expands regions with less matter

How does gravity impact a nebula?

• It forces the atoms within it to undergo nuclear fusion

• It separates and sorts the atoms by size

• Gravity generates enough heat to birth a star

• The nebula will create its own gravity

What is nuclear fusion?

• The sharing of electrons between atoms

• The separating of atoms into light and lighter elements

• The combining of lighter atoms to create heavier atoms

• The transfer of energy from older atoms to new atoms

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Which of the following is NOT released from the nuclear fusion reactions in stars?

• Mass amount of energy

• All types of electromagnetic radiation

• Light we see

• Heat we feel

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What forces must balance for a star to form?

• The outward force of dark matter and inward force of dark energy

• Space and matter

• Negatively charged electrons and positively charged protons

• Inward force of gravity and outward force of nuclear fusion

What is stellar nucleosynthesis?

• The formation of stars from a nebula

• The constant recycling of older elements into new ones

• Nuclear fusion that breaks apart atoms into smaller elements

• Nuclear fission in stars that creates elements

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Why are we made of star stuff?

• Life would not be able to exists without the energy we get from our sun, a star

• Stars are only able to form from the biological molecule that we are made of

• The star present at your birth represent your soul

• With the exception of hydrogen and helium all the atoms inside of us come from stars and supernova

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When does a star stop nuclear fusion and why?

• Stars will stop nuclear fusion after creating iron because it is too stable for the reaction to continue

• Nuclear fusion stops once the star has reached too hot of a temperature

• Stars will stop nuclear fusion when the outermost layer of hydrogen evaporates

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What is supernova nucleosynthesis?

• The decay of elements lighter than iron into elements heavier than iron

• The creation of elements heavier than iron that cause a star to explode

• The creation of elements heavier than iron in the collapse of a big enough star

• The formation of matter from the light of a supernova

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