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.
Homework and Review Questions
Briefly describe the different stages in life of our star.
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
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?
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
The process in which smaller atomic nuclei combine into larger atomic nuclei is known as
Nuclear fusion begins when temperatures within a protostar reach over
What are the only elements are formed in smaller or cooler stars?
(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?
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
A main-sequence star maintains a stable size as long as it has an ample supply of hydrogen to fuse into
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?
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?
Describe what happens during nuclear fission
What is a planetary nebula? Why does it occur?
How far is the sun from the earth?
Large-scale groups of stars bound together by gravitational attraction are known as
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
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?
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?
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.
(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
In which stage of stellar evolution does a star’s outer shell expand while the inner core contracts?
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?