Liquid Logic: Riddles & Crossword Fun!

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Across
  1. 2. I am a substance that disappears when mixed into a liquid, but I am still there. Who am I?
  2. 5. I am the liquid that helps dissolve other substances. Who am I?
Down
  1. 1. When a change can go back to its original state, it is called this. Who am I?
  2. 3. I control how fast things dissolve. Hot makes me go up, cold makes me go down. Who am I?
  3. 4. When water turns to ice, it's because of me. What am I?