chemistry

posted by .

1.predict and expalain the order of melting point for propanol, butane, and proanone with refernce to their intermolecular forces.

2. The element sodium, aluminum, silicon, phosphrous, and sulfur are in periods 3 of the periodic table. Decribes the metallic bonding present in alumminium and explain why aluinium has higher melting point that sodium.

I am really connfused.. can anybody help me.??

  • chemistry -

    As the polarity of molecules increase, their melting points increase because bonds between the molecules are stronger.

    Metallic bonding is described as a sea of electrons in which the atoms are immersed. Na has one electron from each atom to offer to the sea. Mg has a smaller radius than Na AND it has two electrons to offer; therefore, bonding forces are stronger for Mg and the melting point is a little higher. The same kind of reasoning extends to Al. It is smaller still, it has three electron to offer for each atom, and the melting point is still higher. Here is a site that gives a simplified discussion.
    http://www.chemguide.co.uk/atoms/bonding/metallic.html

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    is the following sentence true or false? Mendeleev used his periodic table to predict the properties of undiscoverd elements.. True: Mendeleev used his periodic table to predict the properties of a undiscoverd element.
  2. CHEMISTRY

    which of the following elements would have the highest melting point?
  3. Chemistry

    Rank from highest to lowest melting point of the following molecules: ethane, 2-butane, trans-2-butane, and cis-2-butane. please explain how you come to your answer.
  4. Chemistry

    Can someone please help me with these chemistry questions...I just don't get it! 1. Using the following elements, rank them in order of increasing melting points, based on the periodic trend for melting point: Sr, Mg, Be, Ba?
  5. chemistry

    .predict and expalain the order of melting point for propanol, butane, and proanone with refernce to their intermolecular forces.
  6. chemistry

    A non-metal element which lies in the third row of the Periodic Table forms a gaseous compound H2Y with hydrogen and the compound Li2Y with lithium, which has a solid crystalline structure and a high melting point (greater than 900 …
  7. intermolecular forces

    arrange these seven substances in order from highest melting point to lowest melting point. H2O, MgO, CCl4, CH2Cl2, CaCl2, N2, PF3
  8. chemistry

    The vapor pressures of several solutions of water-propanol(Ch3Ch2Ch2OH) were determined at various compositions, with thefollowing data collected at 45C: XH2O Vapor pressure (torr) 0 74.0 .15 77.3 .37 80.2 .54 81.6 .69 80.6 .83 78.2 …
  9. chemistry

    As pure elements. all of the halogens are diatomic molecular species. their melting points are: F2, 85 K, Cl2 239 K, Br2 332 K, and I2 457 K. using periodic table, how can i predict the molecular formula of elemental astatine. at the …
  10. Science

    Look at the table of radioactive isotypes below. Isotype Type of Decay Uranium-238 Alpha Nickel-63 Beta Iodine-131 Beta Radium-226 Alpha With the help of a periodic table, predict the element that forms in each case. I'm confused by …

More Similar Questions