Across
- 3. invisible negatively charged particle that orbits the nucleus of an atom
- 5. substance that helps a chemical reaction to proceed more quickly
- 6. an experiment which one or more products of a chemical reaction can escape
- 8. chemical reaction that release energy
- 9. pure substance formed when non-metal combine
- 13. new substance produced in a chemical reaction between reactants
- 15. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
- 16. atom that has become electrically charged because it has lost or gained electrons
- 17. group of atoms joined by covalent bonds
- 18. slow chemical change that occurs when oxygen in the air reacts with a metal
- 19. positively charged particle in the nucleus of an atom
- 20. the smallest part of an element that is representative of that element
- 21. chemical reaction that absorbs energy
Down
- 1. process in which molecules move from an area of high concentration to one of lower concentration
- 2. chemical reaction that occurs when oxygen reacts with a substance to form the other substance
- 4. number of protons in the nucleus of one atom of an element
- 5. an experiment in which all reactants and all products of a chemical reaction are accounted for
- 7. pure substance formed when at least one metal and one non-metal combine
- 10. change of state from a liquid to gas
- 11. mass of one atom of an element calculated form the total number of protons, neutrons, and electrons of that atom
- 12. a table in which the elements are organized by their physical and chemical properties
- 13. characteristic that describes a particular substance
- 14. neutral particle in the nucleus of an atom
- 22. a neutral substance is neither an acid nor a base
- 23. catalyst involved in chemical reaction in living things