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Nuclear Chemistry Review. What is electromagnetic radiation ?. radiation moving at the speed of light. To a certain degree the stability of a nucleus can be correlated to its ratio of _________ to ________. Protons, neutrons. - PowerPoint PPT Presentation
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Nuclear Chemistry
Review
What is electromagnetic radiation?
• radiation moving at the speed of light
To a certain degree the stability of a nucleus can be correlated to its ratio of _________ to ________
• Protons, neutrons
_____________ of cadmium or boron are used to control the
fission process inside the reactor by absorbing neutrons during the
reaction.
• Control rods
What type of radiation has sufficient energy to damage DNA?
• Ionizing radiation
List 2 of the 4 types of nuclear reactions.
• Radioactive Decay• Nuclear Bombardment• Fission• Fusion
What is the name of the woman who was a pioneer of nuclear chemistry?
• Marie Curie
What is the charge of an alpha particle?
• +2
How are nuclear reactions different from chemical reactions?
• Chemical = involve boding of valence electrons; same types & amounts of atoms on reactant side as product side• Nuclear = involve changes in
the nucleus (protons/neutrons); different atoms as reactant side as compared to product s
What are the 3 types of nuclear radiation?
• Alpha particles• Beta particles• Gamma rays
What is the nuclear symbol for an alpha particle AND beta particle?
• Alpha =
• Beta =
What could stop gamma rays?
• Several cm of lead/cement
What could stop alpha particles?
• A piece of paper
What is the charge of a beta particle?
• -1
The spontaneous break-down of a nucleus into a slightly lighter nucleus,
accompanied by the emission of nuclear radiation is known as ____
• Radioactive decay
Radiation with NOT enough energy to ionize atoms or molecules is called
__________
• Non-ionizing radiation
Which type of nuclear radiation travels at the speed of light?
• Gamma rays
Mass of fissionable material needed to sustain a nuclear chain reaction is called
________
• Critical mass
A general term for any type of energy that emanates or radiates outward in all
directions is called ______
• Radiation
Write the hyphen notation of an isotope of radium (Ra) with the mass number of 238 and atomic number of 88
• Radium - 238
Write the nuclear symbol of an isotope with an atomic number of 13 and a
mass number of 29.
A change in the identity of a nucleus because of a change in the number of its
protons is called ______
• Transmutation
What is fission?
• A heavy nucleus SPLITS- forming medium weight nuclei
Atoms of the same element having different numbers of NEUTRONS and, therefore, a different mass number and atomic mass are called ________
• Isotopes
During fission and fusion reactions, what is the relationship
between the MASS of the reactants and the products?
• The mass of the products is LESS than the mass of the reactants
What type of nuclear radiation consists of particles containing
two protons and two neutrons?
• Alpha
Which type of nuclear radiation has NO CHARGE?
• Gamma Rays
______ is the missing mass of a nuclear reaction that is converted
into energy.• Mass defect
Which type of nuclear radiation has the LARGEST mass?
• Alpha particles
The time needed for the decay of one half the atoms in a sample of radioactive
material is known as______________
• ½ life
What powers the sun?
• FUSION
What type of nuclear reaction occurs when the nucleus is hit with alpha particles, neutrons,
protons or other particles?
• Nuclear Bombardment
Small amounts of mass are converted to HUGE amounts of energy according to Einstein's famous formula. What is this
formula?• E = mc2
What type of nuclear reaction happens at TMI?
• FISSION
What is a benefit of radiation?
• Medicine• Military• Anthropology• Food-microwaves• Energy- electricity
What type of radiation is emitted in the following equation?
• Beta Particle
Balance the following equation.
Balance the following equation.
Which type of nuclear radiation has the HIGHEST ionizing ability?
• Alpha Particle
List an example of how radiation is BENEFICIAL.
• Medicine- tracers, cancer treatment• Military – bombs• Anthropology – carbon dating• Food – microwaves• Electricity - TMI
Which type of nuclear radiation has the LOWEST ionizing ability?
• Gamma rays
How long does it take one radioactive atom to decay?
• It is impossible to tell!!–Half-life is based on a sample of
radioactive atoms
What is fusion?
• 2 light weight nuclei combine to form a heavier nucleus
Which would produce the MOST energy from a reaction?
Fission OR Fusion
• FUSION