10th grade Fission, fusion and how radiation is used worksheet

Fission, fusion and how radiation is used

Grade 10 Science Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   A neutron splits uranium with mass number 235 into barium with mass number 141, krypton and 3 neutrons. What is the krypton's mass number, Ari?
2. 2.

   A neutron splits uranium with mass number 235 into xenon with mass number 140, strontium and 2 neutrons. What is the strontium's mass number, Bo?
3. 3.

   Which process joins light nuclei together, Jun?

   • Alpha decay
   • Fusion
   • Fission
4. 4.

   What does a uranium-235 fission produce, Kira?

   • Hydrogen gas and water
   • One helium nucleus by itself
   • Two medium nuclei and neutrons
5. 5.

   Which process happens naturally only at extremely high temperatures, like the Sun's core, Luz?

   • Beta decay
   • Fission
   • Fusion
6. 6.

   How does the energy from 1 kg of uranium-235 by fission compare with burning 1 kg of coal, Milo?

   • About 2.5 million times more
   • About the same amount
   • About 2.5 times more
7. 7.

   Where does the energy released in fission come from, Noah?

   • A tiny loss of mass, E = mc²
   • Heat stored from the Sun
   • Burning the uranium in air
8. 8.

   Fission of uranium-235 gives about 8 × 10⁷ kJ per gram; Sun fusion gives about 6.4 × 10⁸ kJ per gram of hydrogen. Which gives more per gram, and about how many times more, Pia?

   • Fission gives about 8 times more
   • They give the same
   • Fusion gives about 8 times more
9. 9.

   Uranium-235 + neutron → xenon-140 + strontium-94 + ? Which completes it, Ren?

   • 2 neutrons
   • 1 neutron
   • 3 neutrons
10. 10.

    Barium (56 protons) and krypton (36 protons) come from splitting uranium. Do their atomic numbers balance, Tala?

    • Yes: 56 + 36 = 92
    • No: they add to 236
    • No: they add to 141