Ch. 15 Energy

4. The splitting of an atomic nucleus to release energy.
7. An organic compound that contains only carbon and hydrogen atoms.
12. Compounds that are made from oil and used to make plastics, medicines, and cosmetics.
13. Energy-rich substances formed from the remains of organisms.
15. The part of a nuclear reactor where nuclear fission occurs.
16. A mixture of gasoline and alcohol.
17. Electricity produced by flowing water.
20. The intense heat from Earth's interior that warms magma.
21. The splitting of an atomic nucleus to release energy.

1. Cadmium rods used in a nuclear reactor to absorb neutrons from fission.
2. Reducing energy use.
3. Generates electricity by reacting hydrogen with oxygen.
5. Energy from the sun.
6. A layer of material that traps air to help keep a building hot or cold.
8. Fuel made from living things.
9. Uranium rods that undergo fission in a nuclear reactor.
10. The combining of two atomic nuclei to produce a single larger nucleus and much energy.
11. The nuclei of two atoms combine to form a larger nucleus.
12. Another name for the fossil fuel oil.
14. A factory in which crude oil is heated and separated into fuels and other products.
18. The percentage of energy that is actually used to perform work.
19. A solid fossil fuel formed from plant remains.