Ch. 7, 8, & 18 test: Chemical reactions [70 points] Chemistry

 

1. Write the molecular equation, complete ionic equation, and the net ionic equation for a reaction containing the following reactants. Need not balance the chemical equations. If there is no reaction, then write “no reaction”. [24 points]

a. potassium iodide and lead (II) nitrate

b. sodium hydroxide and copper (II) chloride

c. magnesium sulfate and lithium fluoride

d. hydrogen fluoride and copper metal

 

2. Balance the following chemical reactions using the lowest ratio of integers; use “1” as appropriate (an empty blank will be an error). [16 points]

a. ____ CH3CH3 + ____ O2 -> ____ CO2 + ____ H2O

b. ____ Na2CO3 + ____ CuCl -> ____ Cu2CO3 + ____ NaCl

c. ____ Al + ____ H2SO4 -> ____ Al2(SO4)3 + ____ H2

d. ____ Cu  + ____ HNO3 -> ____ Cu(NO3)2 + ____ NO2 + ____ H2O

 

3. What is the oxidation number of the all of the atoms in the following compounds: [9 points]

a. KMnO4 K is _____ Mn is _____ O is ____

b. Na2Cr2O7 Na is _____ Cr is ____ O is ____

c. Cu is ____

d. C2H6 (ethane) C is _____ H is ____


4. Identify the atom / ion that was oxidized or reduced in the following reaction; show the oxidation number near that atom / ion. If it is not a redox reaction, then write “not a redox reaction”. [12 points]

a. HCl + Na -> NaCl + H2

b. CH3OH + O2 -> CO2 + H2O

c. H2 + F2 -> HF

 

5. Write the product(s) in the following reactions; need not balance the chemical equation: [8 points]

a. NaOH + HCl ->

b. LiF + I 2 ->

c. Ca + O 2 ->

d. Mg + H 2O (hint: H 2O = HOH) ->

 

6. Cl - is usually ____________ (soluble or insoluble). [1 point]