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Across 1. The rate at which an object changes position 5. Mass/Volume 8. A shiny substance that is a good conductor of electricity 9. A reflection of a sound back to its source. 12. When a substance changes from a liquid to a solid it reaches this point (2 Words) 14. Heat can be produced by _____ the motion of particles in matter. 16. A letter or combination of letters used to represent an element 18. A book on the edge of a table has _____ energy 19. Opposite magnet poles _____ each other. 20. The speed and direction in which an object moves 21. An instrument used to measure mass 22. Electromagnets work when current is ______

Down 2. The rate of slowdown 3. In a ____ circuit all current flows in a single path 4. A compound that reacts with metals to form _______ is an acid 6. A simple machine that is a form of inclined plane wrapped in a spiral around a piece of metal 7. The subatomic particles that have a negative charge 10. A number that scientists use to tell how many of an element's atoms are in a compound 11. A reaction where one compound breaks down into two or more simpler substances 13. Small bundles of energy that make up light 15. A mixture where one substance is dissolved in a liquid. 17. Anything that has mass and takes up space