Across
- 2. Positively charged particle in the nucleus of an atom
- 3. Chemical reaction that occurs when oxygen reacts with a substance to form a new substance that gives off energy
- 5. A material changes from one state to another
- 7. Chemical reaction that takes place in cells
- 9. Measured by atomic mass unit
- 10. The most reactive of the metals
- 11. Two or more materials react and create a new substance
- 12. Horizontal row of elements in the periodic table
- 13. Invisible negatively charged particle that orbits the nucleus of an atom
- 14. The most stable and unreactive elements
- 16. Catalyst involved in chemical reactions in living things
- 17. Pure substance formed when non metals combine
- 21. Solid liquid gas and plasma
- 23. Slow chemical change that occurs when oxygen in the air reacts with a metal
- 24. Element that has both metallic and non metallic properties
Down
- 1. An experiment in which one or more products of the chemical reaction can escape
- 3. The law that states that matter is not created or destroyed in a chemical reaction
- 4. Combination of symbols that represent a compound
- 6. The fourth state of matter
- 8. Pure substance formed when at least one metal and one non metal combine
- 15. The most reactive non metals
- 18. An experiment where all reactants and products of a chemical reaction are accounted for
- 19. Substances that help a chemical reaction to proceed more quickly
- 20. Vertical column of elements in the periodic table
- 22. Neutral particle in the nucleus of an atom