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ANSWERS CHEM 1351 Test 1

ANSWERS CHEM 1351 Test 1 - Your name CHEM 1351 Hour Test#1...

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Your name ______________________________________ CHEM 1351 - Hour Test #1 - Wed 21, 2007 _____ 1. Absolute zero (-273ºC) is the temperature where all molecular motion stops . _____ 2. Convert 1 milligram into grams: 1 milligram equals 0.001 gram . _____ 3. How many millimeters in a meter? 1000 . _____ 4. Room temperature is about +25ºC . _____ 5. The leading chemical product in the United States is sulfuric acid . _____ 6. Which is a compound? CaCO 3 . _____ 7. Which is a mixture? air . _____ 8. Which is a physical change? Water freezes . __________ 9. What is the chemical symbol for [various possibilities: example: chromium = Cr ] (fill-in) _____ 10. When wood burns, the process is a chemical exothermic process . _____ 11. Which are "rare earth" elements? praseodymium and erbium . _____ 12. Which element is chemically inert? krypton . _____ 13. Which are halogens? chlorine and bromine . _____ 14. Which are semiconductors? silicon and germanium . _____ 15. Which element is diatomic? nitrogen . _____ 16. Which statement is true about elemental sodium? loses electrons easily . _____ 17. Gallium was predicted by Mendeleev . _____ 18. Who discovered the Law of Conservation of Mass? Lavoisier .
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