CHM 1045
Dr. Michael Blaber

Name_________________________

SS #__________________________

Homework #3

  1. For the following elements write down the most probable ionic form (2 points)

    2. Sr Sr2+

    Cs Cs+

    I I-

    Se Se2-

  2. For the ions in question #1 give examples of the ionic compounds they might form with either Chloride ion or Lithium ion (2 points)

    3. SrCl2

    CsCl

    LiI

    Li2Se

  3. Write the balanced chemical equation for the combustion of butanol. (C4H10O). (2 points)

    4. C4H10O + 6O2 -> 4CO2 + 5H2O

    C 4 C 4

    H 10 H 10

    O 13 O 13

     

  4. What is the formula weight of Octanol (C8H18O)? (1 point)

    5. (8*12.01) + (18*1.008) + (1*15.999) = 96.08+18.14+15.999=130.22 amu

     

     

  5. Magnesium reacts with oxygen to produce the ionic solid magnesium oxide (MgO). Which other elements would you predict would react with oxygen in a similar reaction? (1 point)

Group 2A, alkaline earth metals, or Be, Mg, Ca, Sr, Ba, Ra
  1. What is the percentage by mass of C, H and O in Glucose (C6H12O6)? (2 points)

Molecular weight: (6*12.01)+(12*1.08)+(6*15.999)=72.06+12.96+95.994=181.01amu

%C = 72.06/181.01 = .3981=39.81%

%H = 12.96/181.01 = .0716=7.16%

%O = 95.994/181.01 = 0.5303=53.03%