Origin of the Chemical Elements Flashcards Preview

Physics 3 > Origin of the Chemical Elements > Flashcards

Flashcards in Origin of the Chemical Elements Deck (45):
1

At the time of the Big Bang, what was energy converted into?

Matter and anti-matter

2

Was more matter or anti-matter produced during the Big Bang?

Matter

3

What did the matter and anti-matter do, and what did it produce?

Most anti-matter annihilated with matter to produce energy

4

What happened to remaining matter if it wasn't annihilated?

It was scattered in all directions

5

What was the initial elemental composition of the universe?

75% hydrogen, 25% helium and very small quantities of other elements

6

How were protons and neutrons created?

Quarks clumped together

7

How were hydrogen atoms formed during the Big Bang?

Protons captured electrons

8

How are stars formed?

Gravity pulls hydrogen and helium together

9

Where were heavier elements formed after the Big Bang?

In stars

10

How were planets formed?

Stars burned out and exploded, expelling heavier elements such as Carbon and oxygen, that formed planets

11

For how long will the sun go on to produce energy?

4.5 billion years

12

What is nuclear fusion?

Hydrogen atoms fusing together, under intense pressure and temperatures, to form helium

13

What name is given to a star that is stable?

Main sequence

14

What is a brown dwarf?

A failed star

15

What two forces act on a star?

Gravity and solar radiation pressure

16

What is a nebulae?

A cloud of gas and dust

17

What is a protostar?

Formed when the gas cloud collapses under its own gravity and hydrogen undergoes fusion

18

What is a yellow dwarf?

A star where the solar radiation pressure acting out equals the heaving acting inwards. The stable stage of a star

19

Describe a black dwarf star

Very cool stage where no light is given out

20

Describe the blue giant stage of a star

Solar radiation pressure acting out equals the gravity acting inwards, this is the stable stage

21

What is a red supergiant?

Where the star runs out of hydrogen. Solar radiation pressure becomes larger than gravity and the star expands and cools

22

What is a supernova?

When a star runs out of fuel completely it becomes unstable, collapses and blows off its outer layer in an enormous explosion

23

Where do all elements with a mass greater than iron come from?

Supernovas

24

What is a neutron star?

The remains of a large exploding star, very dense

25

What is a black hole?

What remains after the most massive stars have exploded. The pull of gravity is so strong that not even light can escape

26

How were protons and neutrons created?

Quarks clumped together

27

How were hydrogen atoms formed during the Big Bang?

Protons captured electrons

28

How are stars formed?

Gravity pulls hydrogen and helium together

29

Where were heavier elements formed after the Big Bang?

In stars

30

How were planets formed?

Stars burned out and exploded, expelling heavier elements such as Carbon and oxygen, that formed planets

31

For how long will the sun go on to produce energy?

4.5 billion years

32

What is nuclear fusion?

Hydrogen atoms fusing together, under intense pressure and temperatures, to form helium

33

What name is given to a star that is stable?

Main sequence

34

What is a brown dwarf?

A failed star

35

What two forces act on a star?

Gravity and solar radiation pressure

36

What is a nebulae?

A cloud of gas and dust

37

What is a protostar?

Formed when the gas cloud collapses under its own gravity and hydrogen undergoes fusion

38

What is a yellow dwarf?

A star where the solar radiation pressure acting out equals the heaving acting inwards. The stable stage of a star

39

Describe a black dwarf star

Very cool stage where no light is given out

40

Describe the blue giant stage of a star

Solar radiation pressure acting out equals the gravity acting inwards, this is the stable stage

41

What is a red supergiant?

Where the star runs out of hydrogen. Solar radiation pressure becomes larger than gravity and the star expands and cools

42

What is a supernova?

When a star runs out of fuel completely it becomes unstable, collapses and blows off its outer layer in an enormous explosion

43

Where do all elements with a mass greater than iron come from?

Supernovas

44

What is a neutron star?

The remains of a large exploding star, very dense

45

What is a black hole?

What remains after the most massive stars have exploded. The pull of gravity is so strong that not even light can escape