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About Angelika

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  1. thanks, but I must be really thick as I don't know how to express a gas in a formula.
  2. I need the molecular formula of oxide of arsenic when it is in its gaseous state and I need to show how I got there. Please help.
  3. Hi, can you show me how to prepare dry hydrogen using the usual apparatus.
  4. Hi, I am asked to prepare a sample of the gas hydrogen selenide with various matrials and equipment. I have an idea how to go about it but need comfirmation. I also need a description of th experiment, so I need the right scientific jorgan. Please help
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