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Life and death of a star. Homework and Review Questions. Q1. Briefly describe the different stages in life of our star. a) f) b) g) c) h) d) i) e) j). Q2. What is the difference between a compound of 2 hydrogen atoms and a fusion of 2 hydrogen atoms?. Q3.

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Life and death of a star

Life and death of a star

Homework and Review Questions


Briefly describe the different stages in life of our star.

a) f)

b) g)

c) h)

d) i)

e) j)


What is the difference between a compound of 2 hydrogen atoms and a fusion of 2 hydrogen atoms?


What is the difference between a proto-star and a main sequence star?


The big bang theory states that the universe began with a gigantic explosion approximately

  • 4.4 billion years ago.

  • 50 billion years ago.

  • 16 billion years ago.

  • 100 billion years ago.


What is the primary reason that no stars were created for the first billion years of the universe’s existence?


What is a nebula?


What stage of stellar evolution is the sun experiencing at this time?

  • giant

  • protostar

  • white dwarf

  • main-sequence


What are 3 possible events that can cause the nebula to begin to form a star?


All of the gold found on Earth was originally created in

  • Our Sun

  • In a star about the size of our Sun

  • In a star much larger than our Sun

  • In supernovas that occurred before our creation of our sun


The process in which smaller atomic nuclei combine into larger atomic nuclei is known as

  • gravitational attraction.

  • nuclear fusion.

  • nuclear fission

  • subjugation.


Nuclear fusion begins when temperatures within a protostar reach over

  • 10,000ºC.

  • 10,000,000ºC.

  • 100,000ºC.

  • 100,000,000ºC.


What are the only elements are formed in smaller or cooler stars?

  • H and He

    (B) up to Fe

    (C) beyond Fe to Bi

    (D) all of them


What process was used to form the planets in the protostar? How did the process work?


Which type of star maintains a stable size because the energy from fusion balances the force of gravity?

  • main-sequence

  • pulsar

  • neutron star

  • supergiant


What pulls all the material together to form the proto-star?


What causes the outward pressure and temperature to increase during the formation of the protostar?


Our solar system is part of the

  • Alpha Centauri galaxy.

  • Milky Way galaxy.

  • Betelgeuse galaxy.

  • Andromeda galaxy.


A main-sequence star maintains a stable size as long as it has an ample supply of hydrogen to fuse into

  • Helium.

  • Oxygen.

  • Carbon.

  • Iron.


What temperature is needed to ignite fusion within the proto-star?


What is happens to the solar core and outer shell during the red giant phase of our sun?


Which of the following stages is the earliest in the development of a star?

  • neutron star

  • dark nebula

  • protostar

  • giant


Why does the sun change color from main sequence to red giant stage?


What is the major fuel during the red giant phase? How does that compare the fuel being used during the main sequence phase?


All stars

  • reflect light from the sun.

  • produce their own light.

  • appear to wander off their star paths.

  • All of the above


Describe what happens during nuclear fission


What is a planetary nebula? Why does it occur?


How far is the sun from the earth?

  • 4.3 light-minutes

  • 9 light-years

  • 8.3 light-minutes

  • 680 light-years


Large-scale groups of stars bound together by gravitational attraction are known as

  • galaxies.

  • quasars.

  • nebulas.

  • clusters.


What is the difference between a black and white dwarf star?


Why won’t our star go supernova? What would have to be different about our sun for it to explode?


When a white dwarf star no longer emits energy, it may become a

  • black dwarf.

  • neutron star.

  • nova.

  • black hole.


What is the chemistry connection between a supernova and the periodic table?


What is meant by the fusion of 2 hydrogen atoms into a helium atom?


What is the difference between a galaxy, and a star?


What stage in the life of a star as massive than the sun is missing in this chart?

  • supernova

  • black hole

  • neutron star

  • red giant


What factors are important to consider in determining the likelihood that there life on other planets in our galaxy?


What are the factors that determine the likelihood that you or I will ever come into contact with life from outside the Earth?


The end of which stage of stellar evolution is marked by the end of helium fusion?

  • protostar

  • black dwarf

  • neutron star

  • red giant


What does main sequence mean?


What is true about the ratio of hydrogen to helium within the star as the star ages? Why?


This is important in determining the stability of a nucleus.

  • The proton to electron ratio

    (B) The electron to neutron ratio

    (C) The neutron to proton ratio

    (D) The valence electron to core electron ratio


In the last stage of stellar evolution following a supernova, stars too massive to form neutron stars may form a

  • black dwarf.

  • white dwarf.

  • red supergiant.

  • black hole.


In which stage of stellar evolution does a star’s outer shell expand while the inner core contracts?

  • supernova

  • main-sequence

  • red giant

  • protostar


What is a fusion reaction?


Why do some stars form white dwarfs and other stars form black holes?


The core of a star is five times more massive than the sun and is composed mostly of helium and carbon. Which stage of stellar evolution is the star most likely in? Why?