Exploring Percent Yield in Chemistry

The video tutorial explains the concept of percent yield, which is the ratio of actual yield to theoretical yield. It discusses how actual yield is the amount of product obtained from an experiment, while theoretical yield is the maximum amount predicted by calculations. The tutorial covers how to calculate percent yield and provides an example problem involving the reaction of potassium chromate and silver nitrate. The instructor demonstrates the use of stoichiometry to convert between grams and moles, and concludes with the final calculation of percent yield.

What is the definition of actual yield in a chemical experiment?

• The predicted product amount based on stoichiometry

• The amount of reactant used in the experiment

• The actual amount of product formed in the lab

• The maximum product amount calculated theoretically

What does theoretical yield represent in a chemistry experiment?

• The amount of reactant used

• The maximum possible amount of product based on calculations

• The minimum possible amount of product expected

• The actual amount of product obtained

Can the actual yield be greater than the theoretical yield?

• No, because calculations are always accurate

• Yes, due to contamination or errors

• No, it is not scientifically possible

• Yes, due to experimental errors

What is the formula for calculating percent yield?

• (Actual Yield - Theoretical Yield) x 100

• (Theoretical Yield / Actual Yield) x 100

• (Theoretical Yield - Actual Yield) x 100

• (Actual Yield / Theoretical Yield) x 100

In the reaction between potassium chromate and silver nitrate, what type of reaction occurs?

• Single replacement

• Double replacement

• Decomposition

• Synthesis

What is the first step in solving a stoichiometry problem in the given example?

• Convert grams to moles

• Calculate the molar mass of reactants

• Measure the reactants

• Predict the product using a balanced equation

How do you convert grams of a substance to moles?

• Divide by the molar mass

• Divide by Avogadro's number

• Multiply by Avogadro's number

• Multiply by the molar mass

What is the theoretical yield of silver chromate in the example if perfectly conducted?

• 0.550 grams

• 0.500 grams

• 0.488 grams

• 0.455 grams

How is percent yield calculated from actual and theoretical yields?

• (Theoretical Yield / Actual Yield) x 100

• Actual Yield - Theoretical Yield

• (Actual Yield / Theoretical Yield) x 100

• Theoretical Yield - Actual Yield

What does a percent yield of over 100% indicate?

• Possible errors or contamination

• Perfect experimental procedure

• Inaccurate theoretical prediction

• Insufficient reactants