Across
- 2. positively and negatively charged atoms
- 6. the elements or compounds that enter into a chemical reaction
- 7. the subatomic particle with a positive charge
- 8. the number of protons in the nucleus of an element
- 13. proteins that speed up chemical reactions that take place in cells and lower the activation energy
- 14. the elements or compounds produced by a chemical reaction
- 18. the basic unit of matter
- 19. the total number of protons and neutrons in the nucleus of an atom
- 20. a pure substance that consists entirely of one type of atom
- 21. the center of the atom
- 23. the subatomic particle with a negative charge
- 24. a bond formed when electrons are shared by atoms
- 25. the location in which substrates bind to the enzyme
Down
- 1. atoms of the same element that differ in the number of neutrons they contain
- 3. the space surrounding the nucleus in which electrons are in constant motion
- 4. the study of compounds that contain bonds between carbon atoms
- 5. the subatomic particle that has no charge
- 9. an amount of energy required to start a chemical reaction
- 10. a bond formed when oppositely charged ions have a strong attraction to one another
- 11. the amount of energy required to increase its temperature
- 12. a substance formed by the chemical combination of two or more elements in definite proportions
- 14. a molecule in which the charges are unevenly distributed
- 15. an attraction between molecules of different substances
- 16. reactants that take place at the enzyme
- 17. a process that changes one set of chemicals into another
- 22. an attraction between molecules of the same substance