Percent Yield

Front

If you predicted that 1.5 moles of magnesium are used in a reaction, and you have 2.0 moles of magnesium, what type of reactant is magnesium?

Back

Excess Reactant

Front

Which of the following is NOT a reason why actual yield is less than theoretical yield? loss of product during purification, conservation of mass, competing side reactions that use up the product, impure reactants causing contamination

Back

conservation of mass

Front

For a chemical reaction, percentage yield represents the

Back

efficiency.

Front

If the percentage yield for a chemical reaction is 80.0%, what does this imply about the actual and theoretical yields?

Back

actual yield is 80.0g for every theoretical yield of 100g.

Front

When two substances react to form products, the reactant which is used up is called the_____.

Back

limiting reactant

Front

In a reaction, 9 grams of a substance are produced. The theoretical yield was 10 grams. What is the percentage yield?

Back

90%

Front

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

Back

theoretical yield

Front

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl₂.
 
Mg +  2HCl --> MgCl₂  +  H₂   
 

Back

HCl

Front

You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich. If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?

Back

peanut butter

Front

When does a chemical reaction stop?

Back

When the limiting reactant is used up