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9th Grade Physical S

Final Exam-Module 13

QuestionAnswer
Model A schematic description of a system that accounts for its known properties.
Nucleus The center of atom containing the protons and neutrons.
Atomic number The number of protons in an atom.
Mass number The sum of the numbers of neutrons and protons in the nucleus of an atom.
Isotopes The atoms with the same number of protons but different number of neutrons.
Element A collection of atoms that all have the same number of neutrons.
Radioactive isotope An atom with a nucleus that is not stable.
Half-life The time it takes for half the originial sample of a radioactive isotope to decay.
Order the three constituent parts of the atom in terms of their mass, from least massive to most massive. Electron, Proton, Neutron
Which is larger, an electron or a proton? -Proton
Which is negatively charged? -Electron
What force keeps the protons and neutrons in the nucleus? What causes this force? -The nuclear force. -The exchange of pions or the strong force.
What causes the nuclear force? -The exchange of pions.
Why can the nuclear force act only over very short distances? -Because pions can only exist for a short time.
What force keeps the electrons orbiting around the nucleus? -The electromagnetic force.
What is the daughter product in beta decay of 98Tc? 98Ru
What is the daughter product in beta decay of 125I? 125Xe
What is the daughter product in beta decay of 144Ce? 144Pr
What is the daughter product in alpha decay of 212Bi? 208Tl
What is the daughter product in alpha decay of 224Ra? 220Rn
What is the daughter product in alpha decay of 220Rn? 216Po
The half-life of the radioactive decay of 226Ra is 1600 years. If a sample of 226Ra orginially had a mass of 10 grams, how many grams of 226Ra would be left after 3200 years? 2.5 grams
The half-life of the man-made isotope 11C is 20 minutes. If a scientist makes 1 gram of 11C, how much will be left in 1 hour? 0.125 grams
A radioactive isotope has a half-life of 3 hours. If a scientist has 30 grams of the isotope, how much is left after 15 hours? 0.9375 grams
List the three types of radioactive particles discussed in Module 13 in the order of their ability to travel through matter. Start with the particle that cannot pass through much matter before stopping, and end with the one that can pass through the most 1. Alpha Particles 2. Beta Particles 3. Gamma Rays
If a piece of paper is placed between a radioactive isotope and a person, which kind of radioactive particle will the person be protected from? Alpha Particles
Created by: LiseBrinkley
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