Stoichiometry review – H.Chem 2017

Please be sure you know everything listed here as well as any other topics previously covered this year!! You will need to have your periodic table, cation/anion sheet, and solubility rules. Show all work on a separate sheet of paper, please!

Know how to do the following:

  • Write formulas for all types of compounds
  • Mass to moles & mass to moles (molar mass)
  • Volume of 1 mole of gas at STP
  • significant figures
  • Predict products of chemical reactions
  • Balance chemical reactions
  • Use mole ratios (which come from balanced reactions)
  • Given a starting amount of a reactant, predict the theoretical yield of a product (in moles, mass, volume, an particles)
  • Calculate the percent yield of a product
  • Determine solubility of products in a reaction
  • Identify the precipitate in a chemical reaction

Practice Problems:

  1. If I burn methane gas (CH4) and produce 5.89 moles of carbon dioxide at STP, how many moles of methane did I burn? How many grams of methane gas did I burn?
  2. In the following reaction: Al2O3  Al + O2, how many moles of Al would be produced from 20 moles of Al2O3?
  3. How many grams of O2 are required to produce 346 grams of ZnO in the following reaction: 2 Zn + O2  2 ZnO
  4. Which is the correct mole ratio of Mg(NO3)2 + K3PO4  Mg3(PO4)2 + KNO3?
  5. If 4.6 grams of hydrogen peroxide decomposes into water and oxygen gas, how many molecules of oxygen gas can I produce?
  6. If I could react 5.3 x 1045 atoms of copper with plenty of oxygen, how many grams of copper (II) oxide could I produce?
  7. If I react calcium acetate with potassium carbonate, what will be the precipitate?
  8. Determine the molar mass for the following, then determine if they are soluble:
  9. Magnesium nitrate
  10. Copper (II) chloride
  11. Silver sulfate
  12. Calcium hydroxide
  13. Magnesium carbonate
  14. Lead (II) sulfate
  15. Will the following reactions work? Predict the products of each, then indicate if the reaction works or not. If not, SAY WHY NOT. Then, BALANCE the reaction.

a) Cu + AgNO3 

b) Zn + H2O

c) Mg + HCl 

d) Na + H2O 

e) Ca(ClO3)2 + CuSO4 

f) AgNO3 + Pb(C2H3O2)2 

g) BaBr2 + Ag2SO4 

  1. Determine what type of reaction the following are, then write out the reaction and balance it. You can assume that all the following reactions “work.”
  2. potassium chloride + silver Nitrate  potassium nitrate + silver chloride type: ______
  3. Iron + copper (II) sulfate  iron (II) sulfate + copper type: ______
  4. Zinc + oxygen gas  Zinc oxide type: ______
  5. Hydrogen peroxide  water and oxygen gas type: ______
  6. zinc + sulfurous acid  Zinc sulfite + Hydrogen gastype: ______
  7. potassium bromide  Potassium and bromine gas type:______
  8. chlorine gas + sodium metal  sodium chloride type: ______
  9. sodium bicarbonate  sodium oxide + carbon dioxide + water type: _____
  10. zinc metal + copper (II) nitrate  zinc nitrate + copper type:______
  11. Carbonic acid + calcium hydroxide  water + calcium carbonate type: ______
  12. Balance the following reaction: Magnesium + oxygen  magnesium oxide. Analyze the picture below. Accurately draw out the resulting products, and be sure to include any excess/left over reactant that did not react fully.

ReactantsProducts

  1. Balance the following reaction: CH4 + O2  CO2 + H2O. Analyze the picture below. Accurately draw out the resulting products, and be sure to include any excess/left over reactant that did not react fully.

Key: = CH4 = O2

ReactantsProducts