Heterogeneous mixture or a homogeneous mixture, or Pure

Pure substance, a heterogeneous mixture, or a homogeneous mixture

  1. For the following substances, state whether they are most likely a pure
    substance, a heterogeneous mixture, or a homogeneous mixture (8 points)
    a) Tap water
    b) Beach sand
    c) Copper wire
    d) A suspiciously cheap “gold” ring sold at the University center by some
    guy named “Rainbow”
  2. Given the following information write the complete chemical symbol
    (i.e. complete with appropriate superscripts) for each element or ion (8
    points)
    Number of
    Neutrons
    Number of
    Electrons
    Number of
    Protons
    Symbol
    13 12 12
    19 18 17
    6 2 5
    35 27 29
  3. Given the following chemical symbols for an atom or ion, write down
    the number of protons, neutrons and electrons (8 points)
    Chemical symbol Number of
    Protons
    Number of
    Neutrons
    Number of
    Electrons
    18O
    2-
    40Ca2+
    40Ar

131I

  1. Write down the chemical formula for an ionic compound of the
    following combinations of metals and nonmetals (8 points)
    a) Sodium and Sulfur
    b) Calcium and Chlorine
    c) Aluminum and Oxygen
    d) Potassium and Bromine
  2. Provide the names for the following chemical compounds or ions (8
    points)
    a) HClO
    b) H2SO4
    c) IO4
  • d) SO4
    2-
  1. Draw chemical structures (i.e. use lines to indicate bonds between
    atoms, and show all atoms) for the following organic molecules or
    functional groups (8 points)
    a) Butane
    b) Cycloheptane
    c) Draw an alcohol functional group (use the letter ‘R’ to represent the
    organic part(s) of the molecule)
    d) Draw a carboxylic acid functional group (use the letter ‘R’ to represent
    the organic part(s) of the molecule)
  2. Determine the percentage by mass of C, H and O in propanol (C3H7OH;
    or C3H8O) (8 points)
  3. If 37.8g of propanol is combusted, how many grams of carbon dioxide
    is produced? Be sure to include the balanced chemical equation for the
    combustion of propanol as part of your answer (12 points)
  4. If 48.7 grams of magnesium chloride is dissolved in 4.35 L of water,
    what is the resulting molarity of the magnesium chloride solution? (6
    points)
  5. Indicate whether the following ionic compounds are most likely
    soluble or insoluble in aqueous solution (8 points)
    a) NaBr
    b) NH4OH
    c) AgCl
    d) Mg(OH)2
  6. Write the balanced molecular equation and the net ionic equation for
    the neutralization reaction between magnesium hydroxide, Mg(OH)2, and
    hydrochloric acid, HCl (10 points)
  7. What are the oxidation numbers assigned to the following atoms of
    each element? (8 points)
    a) CH3COOH
    b) ClO- c) S8
  8. Pure substance, a heterogenous mixture or a homogenous mixture

Sample Solution

 

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