Across
- 7. the energy given off by radioactive elements such as these
- 8. uses letters and numbers to represent the amount of reactants and products involved in a chemical change
- 10. are forces that hold atoms together
- 12. elements gives off energy in the form of rays or particles
- 15. made by people
- 18. a substance present before a chemical change
- 21. another way to release energy is to merge nuclei with smaller masses to form one nucleus with a greater mass
- 22. the chemical building blocks of all living things
Down
- 1. the process in which an acid and a base of equal strength and ion concentration are mixed, producing water and a salt
- 2. describes the way a substance reacts with other substances
- 3. reaction that release energy
- 4. is a compound formed by a reaction between an acid and a base
- 5. taste bitter and turn red litmus paper blue
- 6. materials that change color in the presence of acids or a base
- 9. taste sour and turn blue litmus paper pink or red
- 11. the amount of time it takes for half of an isotypes in a sample of an element to decay by emitting radiation
- 13. produce new substances with chemical properties that are different from those of the original substances
- 14. reaction that absorbs energy
- 16. is a molded material that can retain its shape
- 17. a reaction nwhich the products keep the reaction going
- 19. is splitting of a nucleus into two or more pieces when struck with a moving neutron
- 20. a substance produced by a chemical change