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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


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

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


Q4

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.


Q5

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


Q6

What is a nebula?


Q7

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

  • giant

  • protostar

  • white dwarf

  • main-sequence


Q8

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


Q9

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


Q10

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

  • gravitational attraction.

  • nuclear fusion.

  • nuclear fission

  • subjugation.


Q11

Nuclear fusion begins when temperatures within a protostar reach over

  • 10,000ºC.

  • 10,000,000ºC.

  • 100,000ºC.

  • 100,000,000ºC.


Q12

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


Q13

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


Q14

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

  • main-sequence

  • pulsar

  • neutron star

  • supergiant


Q15

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


Q16

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


Q17

Our solar system is part of the

  • Alpha Centauri galaxy.

  • Milky Way galaxy.

  • Betelgeuse galaxy.

  • Andromeda galaxy.


Q18

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.


Q19

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


Q20

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


Q21

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

  • neutron star

  • dark nebula

  • protostar

  • giant


Q22

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


Q23

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


Q24

All stars

  • reflect light from the sun.

  • produce their own light.

  • appear to wander off their star paths.

  • All of the above


Q25

Describe what happens during nuclear fission


Q26

What is a planetary nebula? Why does it occur?


Q27

How far is the sun from the earth?

  • 4.3 light-minutes

  • 9 light-years

  • 8.3 light-minutes

  • 680 light-years


Q28

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

  • galaxies.

  • quasars.

  • nebulas.

  • clusters.


Q29

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


Q30

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


Q31

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

  • black dwarf.

  • neutron star.

  • nova.

  • black hole.


Q32

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


Q33

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


Q34

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


Q35

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


Q36

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


Q37

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


Q38

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

  • protostar

  • black dwarf

  • neutron star

  • red giant


Q39

What does main sequence mean?


Q40

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


Q41

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


Q42

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.


Q43

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

  • supernova

  • main-sequence

  • red giant

  • protostar


Q44

What is a fusion reaction?


Q45

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


Q46

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?


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