Ch. 8 & 18 chemical reactions             test                               60 points [4 ec]                                                chemistry

1. Write the net ionic equation for  ___; if there’s no reaction, then write “no reaction”.  [12 points]

a.  KCl(aq)  +  AgNO3(aq) →  

b.  Na2SO4(aq)  +  LiOH(aq)  → 

c.  Mix aqueous solutions of sodium carbonate and hydrogen chloride (hint:  class demonstration)

d. Mix aqueous solutions of sodium phosphate and calcium acetate

2.  Identify the type(s) of reaction (i.e. double replacement, single replacement, acid-base, synthesis, precipitation, synthesis, combustion, decomposition).  [10 points]

a.  N2(g)  +  H2(g)  →  NH3(g)  = ____________________________________________________

b.  H2SO4(aq)  +  KOH(aq)  →  H2O(l)  +  K2SO4(aq) =  __________________________________

c.  Cu(s)  +  Zn(NO3)2(aq)  →  Zn(s)  +  Cu(NO3)2(aq) = ___________________________________

d.  C6H12O6(aq)  +  O2(g)  →  CO2(g)  +  H2O(l) =  ______________________________________

e.   NaCl(aq)  +  AgNO3(aq)  → NaNO3(aq)  +  AgCl(s) =  __________________________________

3. Balance the following chemical equations using the lowest ratio of integers; if the coefficient = 1, then write “1”.  [11 points]

a.  ____  C6H12O6(aq)  +  ____  O2(g)  →  ____  CO2(g)  +  _____ H2O(l)

b. ____ Ba(C2H3O2)2  +  ____  K3PO4  →  ___  KC2H3O2  +  ____ Ba3(PO4)2

c.  ____  N2  +  ___  H2  →  ___  NH3

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

a. Cr in K2Cr2O7 is  ______

b.  S in   is  ______

c. Nitrogen in nitrate ion is  _____

d. Carbon in carbon dioxide is _____

e. Oxygen in peroxide ion is  _____

4.  Clearly identify the atom / ion that is oxidized (circle) and reduced (triangle) in the following reaction and write the oxidation number near each atom / ion that is involved in the oxidation or reduction (i.e. usually, there are 4 atoms  / ions).   [16 points]

a.  Zn  +  HCl  →  ZnCl2  +  H2

b.  CH4  +  O2  →  CO2  +  H2O

c. H2O →  O2  +  H2

d.  O2  +  H2  →  H2O

5.  Fill-in the blank; is the chemical soluble or insoluble in water.  [5 points]

a.  Silver acetate =  ____________________

b.  Magnesium hydroxide =  _____________

c. Ammonium phosphate  =  _____________

d. Lead (II)  nitrate =  ___________________

e. Calcium sulfate  =  ____________________