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    which best describes nuclear fission? a nucleus spontaneously splits and absorbs energy. two nuclei spontaneously combine and absorb energy. a nucleus collides with a neutron and splits, releasing energy. nuclei combine to form a heavier nucleus, releasing energy.

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    get which best describes nuclear fission? a nucleus spontaneously splits and absorbs energy. two nuclei spontaneously combine and absorb energy. a nucleus collides with a neutron and splits, releasing energy. nuclei combine to form a heavier nucleus, releasing energy. from EN Bilgi.

    Nuclear Fission

    Nuclear Fission

    Nuclear Fission Nuclear Fission

    Nuclear fission occurs when an atom splits into two or more smaller atoms, most often the as the result of neutron bombardment.

    LEARNING OBJECTIVES

    Describe the process of nuclear fission

    KEY TAKEAWAYS

    Key Points

    Nuclear fission is a process where the nucleus of an atom is split into two or more smaller nuclei, known as fission products.

    The fission of heavy elements is an exothermic reaction, and huge amounts of energy are released in the process.

    Nuclear fission occurs with heavier elements, where the electromagnetic force pushing the nucleus apart dominates the strong nuclear force holding it together.

    In order to initiate most fission reactions, an atom is bombarded by a neutron to produce an unstable isotope, which undergoes fission.

    When neutrons are released during the fission process, they can initiate a chain reaction of continuous fission which sustains itself.

    Key Terms

    fissile: Capable of undergoing nuclear fission.nucleon: One of the subatomic particles of the atomic nucleus, i.e. a proton or a neutron.nuclear fission: Radioactive decay process in which the nucleus of an atom splits into lighter nuclei.

    Nuclear fission is a process by which the nucleus of an atom is split into two or more smaller nuclei, known as fission products. The fission of heavy elements is an exothermic reaction, and huge amounts of energy are released in the process. The nuclei produced are most often of comparable but slightly different sizes, typically with a mass ratio of products of about 3:2 for common fissile isotopes. Most fissions are binary fissions that produce two charged fragments. Occasionally, about 2 to 4 times per 1000 events, three positively charged fragments are produced, which indicates a ternary fission. The smallest of these fragments in ternary processes ranges from the size of a proton to the size of an argon nucleus.

    Nuclear fission: In nuclear fission, an unstable atom splits into two or more smaller pieces that are more stable, and releases energy in the process. The fission process also releases extra neutrons, which can then split additional atoms, resulting in a chain reaction that releases a lot of energy. There are also ways to modulate the chain reaction by soaking up the neutrons.Nuclear fission of U-235: If U-235 is bombarded with a neutron (light blue small circe), the resulting U-236 produced is unstable and undergoes fission. The resulting elements (shown here as Kr-92 and Ba-141) do not contain as many nucleons as U-236, with the remaining three neutrons being released as high-energy particles, able to bombard another U-235 atom and maintain a chain reaction.

    Origin of Nuclear Instability

    Within the nucleus, there are different forces that act between the particles. The strong nuclear force is the force between two or more nucleons. This force binds protons and neutrons together inside the nucleus, and it is most powerful when the nucleus is small and the nucleons are close together. The electromagnetic force causes the repulsion between like-charged protons. These two forces produce opposite effects in the nucleus. The strong nuclear force acts to hold all the protons and neutrons close together, while the electromagnetic force acts to push protons further apart.

    In atoms with small nuclei, the strong nuclear force overpowers the electromagnetic force. As the nucleus gets bigger, the electromagnetic force becomes greater than the strong nuclear force. In these nuclei, it’s possible for particles and energy to be ejected from the nucleus. These nuclei are called unstable, and this instability can result in radiation and fission.

    Neutron Bombardment

    In order to initiate fission, a high-energy neutron is directed towards a nucleus, such as 235U. The combination of these two produces 236U, which is an unstable element that undergoes fission. The resulting fission process often releases additional neutrons, which can go on to initiate other 235U atoms, forming a chain reaction. While nuclear fission can occur without this neutron bombardment, in what would be termed spontaneous fission, this is a rare occurrence; most fission reactions, especially those utilized for energy and weaponry, occur via neutron bombardment. If an element can be induced to undergo fission via neutron bombardment, it is said to be fissile.

    The Atomic Bomb

    Atomic bombs are nuclear weapons that use the energetic output of nuclear fission to produce massive explosions.

    LEARNING OBJECTIVES

    Describe the chemical reaction which fuels an atomic bomb

    KEY TAKEAWAYS

    Key Points

    Atomic bombs are nuclear weapons that use the energetic output of nuclear fission to produce massive explosions.

    Only two nuclear weapons have been used in the course of warfare, both by the U.S. near the end of World War II.

    In fission weapons, a mass of fissile material is assembled into a supercritical mass either by shooting one piece of sub-critical material into another (the “gun” method) or by compressing a sub-critical sphere of material using chemical explosives (the “implosion” method).

    Key Terms

    nuclear weapon: A weapon that derives its energy from the nuclear reactions of either fission or fusion.fusion: A nuclear reaction in which nuclei combine to form more massive nuclei with the concomitant release of energy and often neutrons.

    Source : courses.lumenlearning.com

    Fission and Fusion: What is the Difference?

    Infographic: Learn the difference between fission and fusion - two physical processes that produce massive amounts of energy from atoms.

    Office of Nuclear Energy

    Fission and Fusion: What is the Difference?

    APRIL 1, 2021

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    All of the energy we produce comes from basic chemical and physical processes.

    That’s mostly been accomplished throughout history by burning carbon-based material like wood, coal and gas—or by harnessing power from the sun, wind, and water.

    Fission and fusion are two physical processes that produce massive amounts of energy from atoms.

    They yield millions of times more energy than other sources through nuclear reactions.

    You can check out the difference between the two in this video below.

    Video Url Fission vs. Fusion

    Video courtesy of the Department of Energy

    Fission

    Fission occurs when a neutron slams into a larger atom, forcing it to excite and split into two smaller atoms—also known as fission products. Additional neutrons are also released that can initiate a chain reaction.

    When each atom splits, a tremendous amount of energy is released.

    Uranium and plutonium are most commonly used for fission reactions in nuclear power reactors because they are easy to initiate and control.

    The energy released by fission in these reactors heats water into steam. The steam is used to spin a turbine to produce carbon-free electricity.

    Click above to view our full fission vs fusion infographic.

    Fusion

    Fusion occurs when two atoms slam together to form a heavier atom, like when two hydrogen atoms fuse to form one helium atom.

    This is the same process that powers the sun and creates huge amounts of energy—several times greater than fission. It also doesn’t produce highly radioactive fission products.

    Fusion reactions are being studied by scientists, but are difficult to sustain for long periods of time because of the tremendous amount of pressure and temperature needed to join the nuclei together.

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    Source : www.energy.gov

    Nuclear Fission and Nuclear Fusion Flashcards

    Start studying Nuclear Fission and Nuclear Fusion. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

    Nuclear Fission and Nuclear Fusion

    2.8 81 Reviews

    Research into nuclear fusion will likely require a large investment of time and money before it might be used as an energy source.

    Which statement best describes the benefits that would make the investment worthwhile?

    Fusion requires a large amount of energy and occurs in stars.

    Fusion produces large amounts of energy, and the fuel is found on Earth.

    Fusion produces no radioactive waste, and the fuel is plentiful.

    Fusion requires little energy to begin and would continue through a chain reaction.

    Click card to see definition 👆

    NOT D B

    Click again to see term 👆

    Which is most likely why many scientists reject the cold fusion theory?

    There is too much waste involved in the process.

    Cold fusion experiments have been conducted at room temperature only.

    The process does not produce enough energy to meet the needs of modern humans.

    The original results have not been replicated consistently and reliably.

    Click card to see definition 👆

    D

    Click again to see term 👆

    1/14 Created by brittany_thing2

    Terms in this set (14)

    Research into nuclear fusion will likely require a large investment of time and money before it might be used as an energy source.

    Which statement best describes the benefits that would make the investment worthwhile?

    Fusion requires a large amount of energy and occurs in stars.

    Fusion produces large amounts of energy, and the fuel is found on Earth.

    Fusion produces no radioactive waste, and the fuel is plentiful.

    Fusion requires little energy to begin and would continue through a chain reaction.

    NOT D B

    Which is most likely why many scientists reject the cold fusion theory?

    There is too much waste involved in the process.

    Cold fusion experiments have been conducted at room temperature only.

    The process does not produce enough energy to meet the needs of modern humans.

    The original results have not been replicated consistently and reliably.

    D

    Which statement is true about nuclear fusion?

    It is caused by the same process that causes nuclear fission.

    It does not occur naturally in the solar system.

    It has very low activation energy.

    It produces nearly all the elements that are heavier than helium.

    NOT A

    How does critical mass play a role in nuclear reactions?

    It is the minimum amount of material needed to start a fission reaction.

    It is the minimum amount of material needed to start a fusion reaction.

    It is the minimum amount of material needed to sustain a fission reaction.

    It is the minimum amount of material needed to sustain a fusion reaction.

    C

    Which is a characteristic of nuclear fusion?

    produces radioactive waste

    involves the collision of two nuclei

    commonly used by humans as an energy source

    requires very little activation energy

    B

    Why is it important for scientists to replicate each other's experiments?

    to determine if important scientific results are repeatable

    to help the research of other scientists

    to determine if slight alterations in the experiment can affect the result

    to further their own research

    A

    Which equation demonstrates that nuclear fusion forms elements that are heavier than helium?

    B

    Which element is nuclear fusion least likely to produce?

    hydrogen, which has an approximate mass of 1

    chlorine, which has an approximate mass of 35

    argon, which has an approximate mass of 39

    silicon, which has an approximate mass of 28

    A

    Which type of reaction does this diagram represent?

    mc007-1.jpg

    nuclear fusion because nuclei combine to form a heavy nucleus

    nuclear fission because an atom is splitting into two large fragments of comparable mass

    nuclear fusion because a large amount of energy is

    being released

    nuclear fission because the resulting products are not radioactive

    B

    Which is a characteristic of nuclear fusion but NOT nuclear fission?

    releases large amounts of energy

    is the energy source of stars

    is used in electric power plants

    requires little energy to occur

    B

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