Ch. 10 & 20 chemical reactions.                      test                                          50 points (1 ec)                    honors chemistry

1. What is the oxidation number of  ___.  [10 points]

a. Sulfur in sulfate is  ____

b. Calcium in calcium hydroxide is  ____

c.  Nitrogen in magnesium nitrate is  ___

d. Iron in  Fe2O3  is  _____

e.Oxygen in hydrogen peroxide is  ___

2. Fill-in the blank using the lowest ratio of integers to balance the chemical equation; if the coefficient is one, then write “1”.  [8 points]

a.  ___  C6H6  +   ____  O2  →   _____  CO2   +    _____  H2O

b. ____  Mg(NO3)2  +  ____  K3PO4  →  ___  Mg3(PO4)2  +  ___  KNO3

3. Identify the type(s) of reactions.  [6 points]

Choices (maybe used more than once or none):

a. KClO3   →  KCl  +  O2  is / are   ___________________________

b. HNO3  +  Cu  →  Cu(NO3)2  +  NO2  +  H2O  is / are  ________________________

c. C3H8  +  O2  →  CO2  +  H2O  is / are  _______________________________

d. HCl  +  KOH  →  H2O  +  KCl  is / are  ________________________

4.  Write the net ionic equation for __; if there is no net ionic equation, then write “no net ionic equation”.  [15 points]

a. Mixing aqueous solutions of hydrogen chloride and sodium hydroxide

b.  Mixing aqueous solutions of potassium carbonate and hydrogen bromide

c.  Mixing aqueous solutions of hydrogen iodide and zinc

d. Mixing aqueous solutions of silver nitrate and lithium chloride

e. The combustion of methane, CH4

5.  In regards to the (hypothetical ?) reaction, fill-in the blank, where you identify the atom in the molecule involved in the redox reaction.  [12 points]

a. H2O2  →  H2O  +  O2

i  _________________ is oxidized, while  ______________ is reduced.

b.  CH4  +  O2  →  CO2  +  H2O

i. _________________ is oxidized, while  ______________ is reduced.

c.  SnCl2  +  Cu  →  CuCl2  +  Sn

i. _________________ is oxidized, while  ______________ is reduced.