Chemistry Riddles

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Across
  1. 2. I'm unique in one way but you can find two of me in your daily drink. What am I?
  2. 4. I'm not pure metal, but a mixture you see. Harder, stronger, better I aim to be. What am I?
  3. 5. I repeat myself in structure, long and winding, a synthetic rapture. What am I?
  4. 7. Shiny like a silver, denser than lead, pricier than gold, could stop a bullet, if I wanted to. What am I?
  5. 8. From seas to salts, I’m in your tears, Flavor enhancer, the chef’s cheers. Preserve your foods, or set a trap, I’m in the water, in every lap.
  6. 9. Don't call me a helper; I'm more intricate. Speed up reactions without changing a bit. What am I?
Down
  1. 1. In your drinks, I’m the sparkle you see, Tickling your nose with each sip, I rise as tiny dancers, What am I, in your soda pop dip?
  2. 3. I protect airplanes, bikes, and cars, Lighter than steel, strong like stars, I don’t rust, but I might corrode, Who am I, from which alloys grow?
  3. 4. I’m a silent, colorless royal, In balloons, I’m not found. But keep your produce fresh, In deep cold I’m bound.
  4. 6. I'm one of many, same in name, differing by neutrons in our atomic frame. Who am I?