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Across 2. the gradual destruction of materials through a chemical reaction with the environment 5. potential of Hydrogen 9. vitamin c 11. paper dyed with extracts from lichens; pH indicator 12. neither acidic or basic; pH of 7 13. chemical compound that shows the acidity or basicity of a substance through a color change 14. add water, make less concentrated 15. digestive fluid in the stomach

Down 1. describes a caustic substance that will break down other substances on contact 3. when an acid reacts chemically with a base to form a salt and water 4. ranges from 0 to 14; measures how acidic or basic a substance is 6. acidic precipitation, harmful to the environment, caused by pollutants in the air 7. slippery; turn red litmus blue; pH 8-14 8. taste sour; turn blue litmus red; pH 1-6 10. water removed; condensed