Limiting Reagent & Name: _________________________________

Percent Yield Date: ________________ Period: 1 2 3 4 5 6

1) Identify the limiting reactant and excess reactant in the following situations.

a) firewood burning in a campfire

b) stomach acid breaking down food

c) sulfur compound in the air tarnishing silver

d) NO₂ reacting with water vapor to produce acid rain

2) If 100 grams of cadmium metal and 150 grams of copper II nitrate react, how many grams of copper metal will be produced?

3) 100 grams of calcium hydroxide are added to a beaker containing 75 grams of aqueous HCl. Will all of the calcium hydroxide react?

4) a) Can actual yield ever exceed theoretical yield? Explain.

b) Why do many chemical reactions produce less than the amount predicted by stoichiometry?

5) When 25 grams of carbon are mixed with water under the right conditions, methane (CH₄) and carbon dioxide are formed. If the percent yield of this reaction is 90.0%, how many grams of CH₄ will form?

6) Burning 20.0 grams of magnesium in the presence of nitrogen produces 25.6 grams of product. What is the percent yield for this synthesis reaction?