/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 5 Explain the difference between f... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 18: Problem 5

Explain the difference between fission and fusion.

Short Answer

Expert verified
Fission is a nuclear reaction where a heavy, unstable nucleus splits into two or more lighter nuclei, releasing a lot of energy. Fusion is a reaction where two light nuclei combine to form a heavier one, also releasing a substantial amount of energy. Both reactions are exothermic, but they involve different types of nuclei and processes.

Step by step solution

01

Understanding nuclear fission

Nuclear fission is a reaction in which a large, unstable nucleus is split into two smaller nuclei. This process is accompanied by the release of a large amount of energy in the form of gamma rays and kinetic energy of the fragments. It is the reaction that fuels nuclear power plants and atomic bombs.
02

Understanding nuclear fusion

Nuclear fusion, on the other hand, is a reaction where two light nuclei combine to form a heavier nucleus. This process also releases a lot of energy and is responsible for the energy produced by the stars, including the sun.
03

Comparing Fission and Fusion

Nuclear fission and fusion are both reactions that involve the nuclei of atoms and release a lot of energy, but they are fundamentally different. Fission involves the splitting of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei combine together releasing vast amounts of energy.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Nuclear Fission
Nuclear fission occurs when a heavy, unstable atomic nucleus, such as uranium-235 or plutonium-239, splits into two smaller nuclei, along with a few neutrons. This splitting results in a massive release of energy.
The energy in fission comes from the binding energy of the atomic nuclei. This energy is released because the total binding energy of the resulting products (the smaller nuclei and neutrons) is lower than that of the original nucleus.
  • The excess energy is emitted mostly as heat and gamma radiation.
  • Fission reactions can be initiated by the absorption of a neutron by a fissionable nucleus.
  • The released neutrons can initiate further fission reactions, leading to a chain reaction.
While fission provides the energy used in nuclear reactors and atomic bombs, it is not always easy to control. Reactors use control rods to manage the reaction rate, ensuring safety and efficiency.
Nuclear Fusion
Nuclear fusion is a process where two light atomic nuclei combine to form a single, heavier nucleus. This reaction releases energy because the mass of the resulting nucleus is less than the sum of the original nuclei. The missing mass is converted into energy according to Einstein's equation, \(E=mc^2\).
Fusion occurs naturally in stars, including our sun, where hydrogen nuclei fuse to create helium under extreme temperatures and pressures.
  • Fusion reactions require immense heat, around millions of degrees, to overcome the repulsive forces between the nuclei.
  • It is a very efficient energy source, producing more energy than fission for the same mass of fuel.
  • Fusion has the potential to provide clean energy without long-lived radioactive waste.
Scientists are working to replicate fusion reactions on Earth for sustainable energy production, though achieving the necessary conditions remains a significant challenge.
Energy Release in Nuclear Reactions
Both nuclear fission and fusion release vast amounts of energy due to changes in the nuclei's binding energy. The energy released can be thousands of times greater than chemical reactions, such as combustion.
During nuclear fission:
  • Energy comes from the conversion of mass loss during the splitting of the nucleus into smaller nuclei and neutrons.
  • Typically measured in mega electron-volts (MeV), this energy is harnessed in nuclear power plants to generate electricity.
In nuclear fusion:
  • Energy stems from the fusion of light nuclei into a heavier nucleus, with the energy equivalently released as the mass defect multiplied by the speed of light squared \(E=mc^2\).
  • This is the same process powering stars and potentially yielding energy in future fusion-based power plants.
Both processes showcase the immense power housed within an atom's nucleus, offering a rich source of energy with challenges and benefits distinct to each method.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

What nuclear reaction happens when two small nuclei combine?

The half-life of thorium-234 is 24.10 days. How many days until only one-sixteenth of a 52.0 g sample of thorium-234 remains?

Calculate the neutron-proton ratios for the following nuclides, and determine where they lie in relation to the band of stability. \begin{equation}a. _{92}^{235} \mathrm{U}\end{equation} \begin{equation}b. _{8}^{16} \mathrm{O}\end{equation} \begin{equation}c. _{26}^{56} \mathrm{Fe}\end{equation} \begin{equation}c. _{60}^{156} \mathrm{Nd}\end{equation}

Explain why nuclei that emit alpha particles, such as americium-241, are safe to use in smoke detectors.

Write the nuclear equation for the release of a beta particle by \(_{210}^{82} \mathrm{Pb} .\)
See all solutions

Recommended explanations on Chemistry Textbooks

The Earths Atmosphere

Read Explanation

Organic Chemistry

Read Explanation

Ionic and Molecular Compounds

Read Explanation

Chemical Reactions

Read Explanation

Chemistry Branches

Read Explanation

Nuclear Chemistry

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.