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Questions from Exam Grade 11 Just Check

  1. May 12, 2005 #1
    Hi, my exam is coming pretty soon and I looked at last year's exam and found numerous questions that I don't know. Could someone please check my answers listed below.

    A solution of any type is different from a compound because:
    (A) a compound is always coloured, solutions never are.
    (B) there is more than one phase in a compound.
    (C) a solution contains more than one element.
    (D) the composition of a compound is fixed and a solution isn’t.
    (E) the solution is the same in every way as the compound.

    The oxides of nonmetals, when dissolved in water, generally form: *I don't even know what is oxides are
    (A) acids.
    (B) carbonates.
    (C) salts.
    (D) bicarbonates.
    (E) bases. *I think oxides means oxygen. O+H= base

    An orbital is best described as:
    (A) a cloud with hundreds of electrons in it.
    (B) a cloud holding a maximum of 1e-.
    (C) a cloud which is always perfectly circular.
    (D) a region in space where there is a high probability of finding the electron.
    (E) the spherical path followed by the electron.

    Which of the following exhibits the greatest ionic character?
    (A) RbF
    (B) Al2O3
    (C) CO2
    (D) NH3
    (E) IF

    An oxy-acid is a compound which: * I have no idea but I guess...
    (A) contains only metal and oxygen.
    (B) contains at least three elements.
    (C) does not contain hydrogen.
    (D) is a binary compound.
    (E) is usually a basic compound.

    Which of the following statements about bonding is FALSE?
    (A) The attractive forces are greater than the repulsive forces.
    (B) A single covalent bond always has 2e-.
    (C) A lowering of energy results when bonds form.
    (D) The molecules formed are more stable that the individual atoms.
    (E) Bonding occurs only when equal sharing of electrons occurs.

    Which of the following substances, when dissolved in water, is a non-electrolyte? *Is there a way to find out which one is electrolyte??
    (A) NaCl
    (B) HNO3
    (C) Cu2SO4
    (D) C12H6O12
    (E) MgBr2


    If it is incorrect, please explain it to me why.
    Thank YOU o:)
     
    Last edited: May 12, 2005
  2. jcsd
  3. May 13, 2005 #2

    Gokul43201

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Correct.

    Wrong. Check your text or Google "non-metallic oxide".

    Correct.

    Incorrect. What determines ionic character ?

    Incorrect. GOOGLE ?

    Incorrect. Can you show an example of a single covalent bond that does not have 2 e-s ? This is a bad question because there are actually two FALSE statements. Whoever set this question does not realize that the first statement(A) is also false, but that is not the "required" answer.

    What is an electrolyte ? What must something have, to be an electrolyte ?
    [/QUOTE]
     
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