Physical Science

posted by .

6. In order to turn 2 iron atoms into rust, 2 water molecules must be present. -False?

  • Physical Science -

    To make 2 molecules of Fe2O3 "rust", six O atoms are needed, along with two iron atoms. That would require three water (H2O) molecules, if there were no other source of oxygen. Therefore the correct answer is False.

    http://en.wikipedia.org/wiki/Iron(III)_oxide

  • Physical Science -

    The issue is what is meant by rust. In the real world, there are two iron oxides:
    FeO and Fe2O3 which are the common oxides for the two common valence forms of the iron molecule.

    In common rust, these two oxides and their hydroxides are present, almost half and half, along with trapped water.

    So we give "rust" mixture a "formula" (EVEN THOUGH IT IS NOT A CHEMICAL COMPOUND, but a mixture) Rust consists of hydrated iron(III) oxides Fe2O3·nH2O and iron(III) oxide-hydroxide FeO(OH)·Fe(OH)3. Again, the statement is false using this understanding of rust.


    This leaves us with the IRONII oxide, FeO, which is quite rare. In that case, the statement is true, but this is not refered to as "rust" by anyone I know.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    Equal masses of gaseous N2 and Ar are placed in separate flasks of equal volume at the same temperature. Tell whether each of the following statements is true or false. Briefly explain your answer in each case. (a) There are more molecules …
  2. Science

    1: TRUE or FALSE? Elements are pure types of matter. 2: TRUE or FALSE?
  3. chemistry

    Rust contains an iron-oxygen compound in which there are three oxygen atoms for each two iron atoms. In this compound, the iron to oxygen mass ratio is 2.325:1. Another compound of iron and oxygen contains these elements in the ratio …
  4. Physical Science

    The conversion of water to ice is considered a physical change, whereas the conversion of iron to rust is considered a chemical change. Why?
  5. CHM

    Which of the following events are not examples of a chemical reaction?
  6. chm

    Which of the following facts is evidence for the existence of induced dipole-induced dipole interactions between molecules?
  7. Chemistry

    4Fe + 3O2 = 2Fe2O3 So in math book it say " You can interpret this equation in terms of representative particles by saying that four atoms of iron react with three molecules of oxygen to produce two formula unit of iron(iii) oxide" …
  8. Chemistry

    Explain why iron corrodes more quickly in seawater than in freshwater. I'm getting conflicting answers from searching on Google; is it because the corrosion of iron is a redox reaction, which involves a transfer of electrons, and therefore …
  9. Chemistry

    Iron combines with oxygen and water from the air to form rust. If an iron nail were allowed to rust completely, one should find that the rust weighs: I know the answer is the rust should way more than the nail it came from but can …
  10. Physical Science

    An iron fence is left unpainted, and it reacts with the oxygen in the air, forming rust. The formation of rust is an oxidation-reduction reaction, but it is also an example of a(n) _________ reaction My answer is synthesis

More Similar Questions