stars to atoms
Storyboard Szöveg
- 9:00 AM
- 10:00 AM
- Welcome to Chemistry G/T
- Good morning Mrs. Alcaraz, can you please explain what makes elements similar or different from one another?
- Yes I can!
- So like how hydrogen has one proton, no other element can have that same amount?
- So elements like oxygen and sulfur have the same amount of valence electrons because they are both in group 16
- 10:50 AM
- 9:10 AM
- What makes them similar.
- Welcome to Chemistry G/T
- They share some similarities through the family they are in as they have the same amount of valence electrons.
- Elements are different from one another because of the number of protons in their nucleus.
- Yes you're a quick learner.
- Yes once again!
- 11:00 AM
- 9:50 AM
- so when hydrogen and helium fused they form carbon?
- Good morning Mrs. Alcaraz, can you please explain how elements are formed and how they disperse? And how it relates to the age of a star.
- Welcome to Chemistry G/T
- sure!
- Elements we know today were able to be formed due to the fusion of hydrogen and helium.
- yes!
- what about the dispersion of stars, and how it relates to the age of stars.
- So if i look at an EM spectrum and i see traces of helium and hydrogen that means the star is old? And an example of fission would be the splitting of uranium-235 into barium and krypton.
- Welcome to Chemistry G/T
- Think back to what we said, if helium and hydrogen are the building blocks of elements, in order to know the age of stars shouldn't we look for traces of old elements. And elements disperse through the process known as fission
- yes
- Good morning Mrs. Alcaraz can you please explain what happens to unstable elements? How does this relate to finding the age of a star?
- Welcome to Chemistry G/T
- So if i have U 238 it will have to go through radioactive decay to create the stable element PB-206.
- Yes i can. When an element is unstable it undergoes a process called radioactive decay which causes the element to change and create a new one. This process is repeated until the element becomes stable.
- Yes.
- How can you find the age of the age of a star like this?
- Welcome to Chemistry G/T
- For example scientists were able to know when the big bang occurred due to radioactivity.
- Radioactive decay is used to determine the age of stars because of how unstable the stars were in the beginning so scientists use radioactive decay to figure out how old the star is.
- Yes!
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