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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.

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Life and death of a star

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  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 universe’s 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 won’t 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 star’s 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?

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