Mrs. Brandt's 8th Grade Science
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is the release of particles and energy from nuclear decay? | radioactivity
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| Why is carbon 14 radioactive? | its ratio of protons to neutrons is not stable
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| On what does the stability of an isotope’s nucleus depend? | the ratio of protons to neutrons
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| What radiation can be stopped with a sheet of paper? | alpha particles
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| What is the time it takes for the ½ of the nucleus in a radioactive sample to decay? | half-life
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| What is the process of changing one element into another through nuclear decay? | transmutations
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| What do scientists use Carbon-14 for? | to calculate the age of once living things EX: bones
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| What type of radiation penetrates thick metals and concrete? | gamma rays
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| Name the three types of radiation. | alpha, beta, gamma
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| Which type of particle occurs when high speed electrons are emitted from a nucleus? | beta particles
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| What type of radiation can be stopped with a thin sheet of metal? | beta radiation
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| What radiation is made of two protons and two neutrons? | alpha radiation
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| What happens when the strong force is not big enough to hold the nucleus together? | the nucleus decays or breaks down giving off radiation
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| What device detects radiation by producing a current and ‘clicking’? | Geiger counter
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| What did Marie Curie discover? | radioactive Radium and Polonium
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| Who discovered radioactivity and how? | Bequerel with uranium and a photographic plate
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| What radiation is electromagnetic waves with high-frequency energy? | gamma radiation
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| What causes protons and neutrons to be attracted to each other in the nucleus? | strong force
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| Why is carbon-14 radioactive? | its ratio of protons to neutrons is 6/8= .75. In order to be stable it needs to be 1.
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| How does carbon dating work? | the ratio of C-12 to C-14 twlls how many half-lifes has passed
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| What is the process of splitting a nucleus into two smaller nuclei releasing a huge amounts of energy? | nuclear fission
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| What is the process of combining together 2 nuclei with low masses to make one larger one? This also releases huge amounts of energy. | nuclear fusion
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| What type of reaction is used in a nuclear power plant? | Nuclear fission reaction
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| How is nuclear fission controlled in a power plant? | control rods that absorb some of the neutrons which split atoms
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| What type of reaction takes place in the sun and stars? | Nuclear Fusion reaction
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| What is the range of atomic numbers of elements whose isotopes are all radioactive? | all elements past #83
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| Name cons to nuclear power. | radioactive waste is produced and there is no way to store it, if something goes wrong, radioactivity is released into the environment
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| Name pros of nuclear power. | lots of energy from little fuel, no pollutants into air, no carbon dioxide released into air
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| How is radioactivity useful in medicine? | radioactive tracers used to detect problems, radiation can kill cancer cells
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| Know how to solve half-life problems and problems with radioactive or not elements!!! | Know how to solve half-life problems and problems with radioactive or not elements!!!
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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