limiting reagent and percent yield

1. What is a limiting reagent?

• any reactant used up first in a reaction.
• any reactant left over at the end of a reaction.
• the maximum amount of product formed from a given amount of reactant.
• the purity of the reactant.

2. True or False?
A chemical reaction stops before the limiting reagent is used up.

• True
• False

3. The reactant that is not completely used up in a chemical reaction is called the __________ .

• spectator reagent
• limiting reagent
• excess reagent
• catalyst

6. What is theoretical yield?

• the maximum amount of product that could be formed from a given amount of reactant.
• the amount of product that actually forms when a chemical reaction is carried out in a laboratory.
• the efficiency of a particular chemical reaction within the respective conditions.
• the reactant that is used up first in a reaction.

7. The amount of product that actually forms when a chemical reaction is carried out in a laboratory is called the _________ yield.

• actual
• theoretical
• percent

True or False?
The actual yield is usually greater than the theoretical yield.

• False
• True

9. Complete the equation for the percent yield of a chemical reaction:
Percent yield=(________)÷(________)×100%

• actual yield; theoretical yield
• theoretical yield; actual yield

11.
LiOH + KCl → LiCl + KOH    
a)  I began this reaction with 20 grams of lithium hydroxide.  What is my theoretical yield of lithium chloride? 

• 35.5 grams
• 11.3 grams
• 0.03 grams
• 0.09 grams

11.
LiOH + KCl → LiCl + KOH 

b)  I actually produced 6 grams of lithium chloride and I began this reaction with 20 grams of lithium hydroxide. What is my percent yield?

• 16.9%
• 5.91%
• 1.88%
• 12.3%

12.
C₃H₈ + 5 O₂ →3 CO₂ + 4 H₂O     
a)  If I start with 5 grams of C₃H₈, what is my theoretical yield of water?

• 8.2 grams
• 2.0 grams
• 11 grams
• 5.6 grams