chemistry final

What are the 2 lightest elements in stars?

• H & He

• O & C

Tags

NGSS.HS-ESS1-3

Two isotopes of hydrogen fuse into _.

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

NGSS.HS-PS1-8

Our sun is a .........

• Yellow Super Giant

• Star

• White Dwarf

• Blue giant

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

Creates elements heavier than Fe

• Low Mass Stars

• High Mass Stars

Tags

NGSS.HS-ESS1-3

Process stars make light and energy

• Fission

• Fusion

• Confusion

• Diffusion

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

NGSS.HS-PS1-8

What cloud formation are stars born in?

• Nursery

• Oort cloud

• Kuiper Belt

• Nebula

All stars start as a NEBULA. Gravity can pull some of the gas and dust in a nebula together. A star is born when the gas and dust from a nebula become so hot that nuclear fusion starts. Once a star has “turned on” it is known as a MAIN SEQUENCE STAR. When a main sequence star begins to run out of hydrogen fuel, the star becomes a RED GIANT or a RED SUPER GIANT.

After a low or medium mass or star has become a red giant the outer parts grow bigger and drift into space, forming a cloud of gas called a PLANETARY NEBULA. The blue-white hot core of the star that is left behind cools and becomes a WHITE DWARF. The white dwarf eventually runs out of fuel and dies as a BLACK DWARF.

A dying red super giant star will explode as a SUPERNOVA. After the star explodes, some of the materials from the core of the star are left behind. A core of 1.5-3 solar masses may form a neutron star. A more massive core greater than 3 solar masses becomes a BLACK HOLES when it dies.

In which type of star has fusion stopped?

• White Dwarf

• Main Sequence Star

• Supernova

• Red Giant

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

Stars are made up of ______ of a dust cloud.

What percent of hydrogen are stars made up of?

• 50%

• 73%

• 2%

• 89%

Tags

NGSS.HS-ESS1-3

Which is the stage where a massive star

explodes and releases a lot of energy?

• Red supergiant

• Supernova

• Black hole

• Main sequence

Tags

NGSS.HS-ESS1-3