Chemical Reactions Quiz% yield BLOCK 2

In a classroom experiment, Keriana and Jordan are determining the percent yield of NaCl from the reaction between NaHCO3 and HCl. What is their first step?

• Record the mass of NaCl after heating

• Record the mass of the beaker

• Record the mass of NaHCO3

• Measure the volume of HCl used

During a classroom experiment, Jordan and Sydney are calculating the percent yield of NaCl. Which of the following is not directly measured for this calculation?

• Mass of NaHCO3 used

• Mass of NaCl obtained after the reaction

• Mass of the container

• Volume of CO2 released

During a science fair, Angel and Sydney perform a chemistry experiment where they react NaHCO3 with HCl. What is the chemical formula for the gas produced along with water and NaCl in this reaction?

• CO2

• H2O

• NaCl

• HCl

During a school science fair, Sadie and Rachel are demonstrating a chemical reaction by placing a larger beaker over the one containing HCl. What is the purpose of this setup?

• To measure the volume of HCl

• To prevent splattering

• To increase the reaction temperature

• To observe the color change

During a chemistry lab, Angel and Sydney are calculating the yield of NaCl produced in their experiment. What is the first step they should take?

• Convert the moles of NaCl to grams

• Calculate the number of moles of NaHCO₃

• Measure how much NaCl was actually produced

• Calculate the percentage yield

In a classroom experiment, Sadie and Jordan are determining the theoretical yield of NaCl. How is it determined?

• By calculating the number of moles of NaCl that should be produced

• By measuring the actual yield of NaCl

• By calculating the percentage yield

• By converting the moles of NaHCO₃ to grams

After calculating the number of moles of NaCl that should be produced in Sydney's chemistry experiment, what is the next step?

• Calculate the percentage yield

• Measure the actual yield of NaCl

• Convert the moles of NaCl to grams (theoretical)

• Calculate the number of moles of NaHCO₃

During a chemistry lab, Evian and Sydney conducted an experiment to produce NaCl. How is the percentage yield of NaCl calculated based on their experiment?

• (Actual yield / Theoretical yield) x 100%

• (Theoretical yield / Actual yield) x 100%

• (Actual yield + Theoretical yield) x 100%

• (Theoretical yield - Actual yield) x 100%

In a chemistry class experiment, Marissa calculated the theoretical yield of a salt as 73g
Actual yield obtained by Angel was 62g
Calculate the percent yield.

• 1.16%

• 116%

• 85%

• 76%

 In a chemistry class, Samantha conducted an experiment and predicted the yield of a reaction, but the actual yield was different. What is the equation to calculate the Percent Yield?

• (predicted/experimental) X 100

• (experimental/predicted) X 100

• (experimental - predicted)/ Predicted X 100