Across
- 1. Chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
- 3. Change of state from a liquid to a gas
- 6. Change that results when two or more substances react to create a different substance or substances
- 8. Orbit of electrons around the nucleus of an atom
- 11. An experiment in which all reactants and all products of a chemical reaction are accounted for
- 15. Number of protons in the nucleus of one atom of an element
- 18. Principle that matter is not created or destroyed in a chemical reaction
- 20. A system of easy to see warning symbols on hazardous materials
- 22. Group of atoms joined by covalent bonds
- 23. Group of atoms atoms acting as one
Down
- 1. Change of state from a gas to a liquid
- 2. Catalyst involved in chemical reactions in living things
- 4. Group 1 elements in the periodic table, not including hydrogren
- 5. Group 2 elements in the periodic table
- 7. The most reactive non-metals
- 9. Slow chemical change that occurs when oxygen in the air reacts with a metal
- 10. Change of state from a solid to a liquid
- 12. Anything that has mass and occupies space
- 13. Mass of one atom of an element calculated from the total number of protons,neutrons, and electrons of that atom
- 14. A solution in which water is the solvent
- 16. The most stable and unreactive elements
- 17. Cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated from the other substance
- 18. Combination of symbols that represent a compound
- 19. The smallest part of an element that is representative of that element
- 21. Chemical combination of two or more elements in a specific ratio