1. Balance the following equations…
a. K + H2O à KOH + H2
b. Ca + O2 à CaO
c. Na2O + H2O à NaOH
d. KClO3 à KCl + O2
2. Identify the following reactions as combination (C), decomposition (D), single displacement (SD), or double displacement (DD).
a. 2Al(OH)3 + 3H2SO4 à Al2(SO4)3 + 6H2O ______
b. 4K + O2 à 2K2O ______
c. Cl2 + 2NaBr à Br2 + 2NaCl ______
d. 2HgO à 2Hg + O2 ______
e. MgCl2 + 2AgNO3 à 2AgCl + Mg(NO3)2 ______
3. Use the following balanced equation to complete the stoichiometry calculations:
2Al + 3CuSO4 à 3Cu + Al2(SO4)3
a. How many moles of Cu can be produced by 7 moles of Al?
b. How many grams of CuSO4 are needed to produce 4 moles of Cu?
c. How many grams of CuSO4 are required to react with 125 grams of Al?
4. Given the following balanced equation: 4K + O2 à 2K2O
How many moles of K2O can be produced from the reaction of 100.0 grams K and 75 grams O2?
What is the limiting reactant?
5. What is the percent yield when 123 g Ag2O reacts with an excess amount of carbon to produce 110 g Ag ? (Be sure to balance the equation)
Ag2O + C à CO2 + Ag
6. In which type of reaction would you use the ACTIVITY SERIES? How does the activity series rank the elements (in which order)?
7. Assuming that zinc is a more active metal than lead, what will happen if a lead metal strip is placed into a solution of zinc (II) nitrate?
a. More lead metal will be formed
b. Lead will replace zinc in the solution
c. Zinc and lead will combine to form a double metal compound.
d. Nothing will happen
8. Given that CuCl2 and Mg react to form Cu and MgCl2, what type of reaction is this, AND, what could you conclude?:
a. Copper is a less active metal than magnesium
b. Copper is a more active metal than magnesium
9. What do stoichiometric relationships allow you to do?
a. Decide if a reaction is possible
b. Discover new elements
c. Predict amounts of products formed
d. Eliminate all toxic chemicals
10. To convert a known volume of a gas at STP to number of moles, what number do you use to divide with?
11. DETERMINE the type of reaction and PREDICT the products of the following reactions:
a. Al2(SO4)3 + Ca(OH)2 è
b. C3H8 + O2 è