Percent Yield Quiz

What is the formula to calculate percent yield?

• A) \frac{\text{Actual Yield}}{\text{Theoretical Yield}} \times 100

• B) \frac{\text{Theoretical Yield}}{\text{Actual Yield}} \times 100

• C) \frac{\text{Actual Yield}}{\text{Theoretical Yield}}

• D) \frac{\text{Theoretical Yield}}{\text{Actual Yield}}

If the theoretical yield of a chemical reaction is 50 grams and the actual yield is 45 grams, what is the percent yield?

• A) 90%

• B) 110%

• C) 80%

• D) 95%

What does a percent yield greater than 100% indicate?

• A) The reaction was perfectly efficient.

• B) There was an error in measuring the actual yield.

• C) The theoretical yield was underestimated.

• D) Both B and C are correct.

A chemist calculates the percent yield of a reaction to be 75%. What does this indicate about the reaction?

• A) The reaction produced 75% more product than expected.

• B) The reaction produced 25% less product than expected.

• C) The reaction produced 75% of the expected product.

• D) The reaction did not occur.

If you obtain a percent yield of 100%, what can be inferred?

• A) The actual yield was double the theoretical yield.

• B) No products were formed in the reaction.

• C) The actual yield was exactly the same as the theoretical yield.

• D) The reaction did not proceed as expected.

In an experiment, if the theoretical yield is 200 grams and the percent yield is 50%, what is the actual yield?

• A) 100 grams

• B) 400 grams

• C) 50 grams

• D) 150 grams

Why is it impossible to achieve a percent yield greater than 100% in a perfectly controlled experiment?

• A) Because the actual yield can never exceed the theoretical yield.

• B) Because the reaction always proceeds with 100% efficiency.

• C) Because the theoretical yield is always calculated incorrectly.

• D) Because all reactions consume some of the products.

What factors can cause the percent yield to be less than 100%? (Select all that apply)

• A) Incomplete reactions

• B) Side reactions producing other products

• C) Perfect reaction conditions

• D) Loss of product during recovery

If the actual yield of a product in a chemical reaction is 30 grams and the percent yield is 60%, what was the theoretical yield?

• A) 20 grams

• B) 50 grams

• C) 60 grams

• D) 45 grams

What does a low percent yield suggest about a chemical reaction?

• A) The reaction is highly efficient.

• B) There might have been errors in the experiment.

• C) The reaction proceeded exactly as planned.

• D) The theoretical yield was overestimated.