Formation of Heavy Elements Flashcards
The most accepted theory about the formation of the universe which explains that it continues to expand
big bang theory
The following are light elements except
a. helium c. lithium
b. hyd d. iron
d. iron
The process of forming elements is known as;
nucleosynthesis
Light elements such as hydrogen and helium are formed through the process
of __________ nucleosynthesis.
big bang
Which element is the lightest and at the same time the most abundant in outer
space?
a. hydrogen
A reaction in which two or more nuclei combine to form heavier nuclei
nuclear fusion
What element can be formed when three atoms of helium are fused?
carbon
Which of the following elements DOES NOT belong to the group?
a. beryllium c. iron
b. silicon d. oxygen
a. beryllium
The process in which elements are formed at the center of a star.
stellar nucleosynthesis
Elements bigger than Iron are formed through_______.
Supernova nucleosynthesis
When Carbon atom is combined with Helium atom, the element _______ will
be formed.
oxygen
Average stars have longer life span than massive stars. This is
because
b. they have more fuel to burn
Our sun is in what phase of its life cycle?
main sequence star
contains only heavy elements?
carbon, silicon, magnesium
In which stage do massive stars explode and release large amount of energy?
super nova
The star is unable to generate heat when it runs out of hydrogen in its core leading to its contraction and expansion. It cools down and glows red. The Helium fused into Carbon.
RED GIANT
Red giant star becomes exhausted of nuclear fuel, the outer material is blown off into space leaving the inert Carbon.
WHITE DWARF.
Giant cloud of gas and dust
NEBULA
It is formed from nebula due to the gravity that pulled Hydrogen gas together until it spins faster and faster and becomes ignited.
A PROTOSTAR rises
starts to form when nuclear fusion
occurs at the core of the star, it begins to contract, glow and become stable. Hydrogen is converted into Helium.
MAIN SEQUENCE STAR
This is said to be the remain of the white dwarf that cooled down and no longer emits light and heat.
The hypothetical BLACK
DWARF.
is formed from supernova explosion. This is also the smallest star
NEUTRON STAR
Explosion of star releases large amount of
energy. Because of that, elements are dispersed into the space.
r SUPERNOVA
s a region in space where gravity is too strong that
no matter can escape from it
BLACK HOLE
A more massive main sequence star evolves, cools, and expands faster than a low-mass star and will turn into the largest known star. Carbon fusion still occurs and Oxygen
formed.
RED SUPER GIANT
A more massive main sequence star evolves, cools, and expands faster than a low-mass star and will turn into the largest known star. Carbon fusion still occurs and Oxygen
formed.
RED SUPER GIANT
happens when there is a slow
rate of capturing neutron while there is a faster rate of radioactive decay hence increasing the proton by 1.
S-process or slow process
means that there is a faster rate of
capturing neutron before it undergoes radioactive decay thus, more neutrons can be combined in the nucleus. This is what happens in a supernova forming heavier elements than Iron with the process known as supernova nucleosynthesis.
R-process or rapid process
Which process produced Star’s energy?
nuclear fusion
Which of the following will sun’s evolve when reaches the end of red giant
phase?
white dwarf
These are the biggest stars in the universe.
red super giant
Which of the following gases are major components of star?
hydrogen and helium
Which is the first stage of a star’s life cycle?
nebula
In main sequence star, Hydrogen fuses and converted to Helium and Helium
is converted into ________ at its core.
carbon
What object is formed from gas and dust particles which are pulled together by gravity and no nuclear fusion has happened yet?
c. protostar
Who stated that we are made of star stuff?
Carl Sagan
What is the sign that a protostar will transform into the next stage?
Protostar will transform when Hydrogen nuclear fusion begins.
.When does a star become unstable?
Star become unstable when it runs out of fuel
Which fusion of elements does Iron come from?
silicon fusion
