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zaynahf Group Title

Basic chem help

  • one year ago
  • one year ago

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  1. zaynahf Group Title
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    |dw:1357783219427:dw| i cant figure out how to do that part

    • one year ago
  2. matt101 Group Title
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    Let me ask you a question...what is the mass (in amu) of hydrogen?

    • one year ago
  3. zaynahf Group Title
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    1.01?

    • one year ago
  4. matt101 Group Title
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    Right (let's say 1 amu). How did you get that number?

    • one year ago
  5. zaynahf Group Title
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    Periodic table I was wondering if the answer was a specific #, or just general, like 'same as the atmc #' or whatever

    • one year ago
  6. matt101 Group Title
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    Oh, I see...well in that case... Take a look at helium then. Its atomic number is 2, but its mass is 4 amu. How do you explain the difference?

    • one year ago
  7. zaynahf Group Title
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    double? But thats not true for all, right?

    • one year ago
  8. zaynahf Group Title
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    *It might be close to it though

    • one year ago
  9. matt101 Group Title
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    Right. In fact, you'll see for every element other than hydrogen that the mass is higher than the atomic number. I'll explain the answer to your original question. The atomic number, as you probably know, indicates the number of protons in that element. Protons have an atomic mass of 1 amu. The reason why the mass if often higher than the atomic number is that there are neutrons as well, which also have a mass of 1 amu. Electrons are said to have a mass of ~0 since they are far smaller than either protons or neutrons (less than 0.05% their mass, in fact). The reason the mass of hydrogen is the same as the atomic number is because it only has one proton in the nucleus and no neutrons.

    • one year ago
  10. zaynahf Group Title
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    Ohh.. i see what you mean.. So it would be like this?|dw:1357784390834:dw|

    • one year ago
  11. matt101 Group Title
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    I would say ~0 since electrons still do have mass (though it's a very, very small number). You got it!

    • one year ago
  12. zaynahf Group Title
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    Ok, and what does ~0 mean.. really close to 0?

    • one year ago
  13. matt101 Group Title
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    Approximately 0

    • one year ago
  14. zaynahf Group Title
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    Thanks!

    • one year ago
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