is it true that droplet of water has

Discussion in 'General Science' started by Lightfire, May 31, 2012.

  1. Lightfire

    Thread Starter Well-Known Member

    Oct 5, 2010
    100 billions of atoms ? :confused: what is atom? ( i understand it as smallest unit. ) but what really is it role? :confused:
  2. Wendy


    Mar 24, 2008
    Atoms are the basic elemental building blocks. They are the smallest particles where you can still have an element, and not a sub atomic particle.

    Any atom bigger than helium was likely created in a supernova. It is why people (starting with the late Carl Sagan) likes to say we are made of star stuff, what we are made from is the result of massive stellar explosions, over time.
  3. Brownout

    Well-Known Member

    Jan 10, 2012
    There are two hydrogen and one oxygen atoms to each molecule of water. So, every water molecule is made up of three atoms. The symbol H20 for a water molecule represents those atoms.
  4. Wendy


    Mar 24, 2008
    One of the expected outgrowths of technology is the use of atoms as components, and the creation of machines using atoms. This is the basis for the concept of nanotech.

    It isn't a major science yet, but the first baby steps have been taken.
  5. #12


    Nov 30, 2010
    Homework problem for first semester chemistry class:
    Given: A pure gold hemisphere of diameter 1/2 mm.
    Calculate how may atoms of gold are available on the curved surface.
    The answer was somewhere in the millions...or maybe it was in the billions.
    Hard to remember after 35 years.

    A normal drop of water is a lot larger than 1/2 mm. A water molecule is a lot smaller than a gold atom. The interior of the water droplet also contains molecules. No wonder that a water droplet contains billions of molecules.
    Mongrel_Shark likes this.
  6. Markd77

    Senior Member

    Sep 7, 2009
    Each molecule of water has 3 atoms, 2 hydrogen and one oxygen.
    You can work out the number of molecules in something if you know the mass, the molecular mass and the Avogadro constant:
    It turns out that 1 gram of water has about 3X10^22 molecules so about 9X10^22 atoms. That's a 9 with 22 zeros after it.
    JMW and Mongrel_Shark like this.
  7. Mongrel_Shark

    New Member

    May 30, 2012
    According to the chart in the front of the nearest science book I just grabbed, A Zetta (Z) is 10^21. So would that be 90Z, or 900Z atoms?:rolleyes:
  8. Markd77

    Senior Member

    Sep 7, 2009
    Last edited: Jun 1, 2012
  9. RobertB

    New Member

    Jun 5, 2012
    Atom are the building blocks of matter that make up every object.
    Markd77 likes this.
  10. coldpenguin

    Active Member

    Apr 18, 2010
    I think that is incorrect.
    If I remember right, any atom larger than C12 ( natural carbon ) requires a super-nova.
    Any atom larger than hydrogen (1 proton) , but smaller than C12, can be created by Fusion, which takes place in normal stars (our star is a first stage SOLar mass 1, so it currently taking two hydrogen atoms, and sticking them together).

    An Atom is made of protons and neutrons.
    A proton is made up of two up spin quarks and a down-spin quark, and a nutron is made up of two down spins plus an up spin (in theory, in reality you have around 35 quark anti-quark pairs which cancel each other out, however at any 'point' in time, there would be 3 left over.
    A neutron ends up as having no charge.
    A proton ends up with a charge of '+1'
    An electron has a change of '-1' (where + and - are all relative, we have
    nothing to actually measure this against. )

    An 'ion' could have no electrons. In practice, the number of electrons around an atom should equal the number of protons, so there is no ionisation.

    In a 'stable' atom, the number of protons should be almost equal to the number of neutrons.
    Each element has a different number of protons. The number of protons defines which element it is. However, some atoms might have more or less neutrons than others. If the balance of neutrons to protons is too far out, a particle might change from one to the other, releasing the energy difference (between an up and a down-spin quark, which have the same energy, in theory, but not in practice).

    Hydrogen has 1 proton. Helium has two protons.
    Oxygen has 8 protons (if I remember right).

    But, you can get heavy hydrogen, one proton plus one neutron. This would be what the heavy is in heavy water.
  11. panic mode

    Senior Member

    Oct 10, 2011
    if you are looking for nice exercise, compare density of lead to density of proton for example.
  12. JDT

    Well-Known Member

    Feb 12, 2009
    Is that more than than the number of grams of water in all the oceans of the world combined? Anyone know?

    If so...

    If you somehow marked all the molecules in your gram of water (a thimble full) and poured it into the sea. Mix up all the oceans (might take millions of years). Then sampled a gram of sea water anywhere in the world. You would find at least one of your molecules there.
  13. Austin Clark


    Dec 28, 2011
    I just tried my hand at the math, and found that (on average) you'd have to pull 35 to 40 grams of sea water to find one of the marked molecules, or 2.7% chance per gram, which is actually extremely surprising.

    Someone wanna verify that?