Life and death of a star

1
Life and death of a star

• Homework and Review Questions

2
Q1

• Briefly describe the different stages in life of
  our star.
• a) f)
• b) g)
• c) h)
• d) i)
• e) j)

3
Q2

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

4
Q3

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

5
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.

6
Q5

• What is the primary reason that no stars were
  created for the first billion years of the
  universes existence?

7
Q6

• What is a nebula?

8
Q7

• What stage of stellar evolution is the sun
  experiencing at this time?
• giant
• protostar
• white dwarf
• main-sequence

9
Q8

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

10
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

11
Q10

• The process in which smaller atomic nuclei
  combine into larger atomic nuclei is known as
• gravitational attraction.
• nuclear fusion.
• nuclear fission
• subjugation.

12
Q11

• Nuclear fusion begins when temperatures within a
  protostar reach over
• 10,000ºC.
• 10,000,000ºC.
• 100,000ºC.
• 100,000,000ºC.

13
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

14
Q13

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

15
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

16
Q15

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

17
Q16

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

18
Q17

• Our solar system is part of the
• Alpha Centauri galaxy.
• Milky Way galaxy.
• Betelgeuse galaxy.
• Andromeda galaxy.

19
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.

20
Q19

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

21
Q20

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

22
Q21

• Which of the following stages is the earliest in
  the development of a star?
• neutron star
• dark nebula
• protostar
• giant

23
Q22

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

24
Q23

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

25
Q24

• All stars
• reflect light from the sun.
• produce their own light.
• appear to wander off their star paths.
• All of the above

26
Q25

• Describe what happens during nuclear fission

27
Q26

• What is a planetary nebula? Why does it occur?

28
Q27

• How far is the sun from the earth?
• 4.3 light-minutes
• 9 light-years
• 8.3 light-minutes
• 680 light-years
•  

29
Q28

• Large-scale groups of stars bound together by
  gravitational attraction are known as
• galaxies.
• quasars.
• nebulas.
• clusters.

30
Q29

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

31
Q30

• Why wont our star go supernova? What would have
  to be different about our sun for it to explode?

32
Q31

• When a white dwarf star no longer emits energy,
  it may become a
• black dwarf.
• neutron star.
• nova.
• black hole.

33
Q32

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

34
Q33

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

35
Q34

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

36
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

37
Q36

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

38
Q37

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

39
Q38

• The end of which stage of stellar evolution is
  marked by the end of helium fusion?
• protostar
• black dwarf
• neutron star
• red giant

40
Q39

• What does main sequence mean?

41
Q40

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

42
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

43
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.

44
Q43

• In which stage of stellar evolution does a stars
  outer shell expand while the inner core
  contracts?
• supernova
• main-sequence
• red giant
• protostar

45
Q44

• What is a fusion reaction?

46
Q45

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

47
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?
•