Worksheet

Theoretical and percent yield

Grade 10 Science Worksheet - Challenge Me

NameDate

Circle the best answer, or write your answer on the line.

  1. A lab mixes 16.8 g of baking soda (84.01 g/mol) with vinegar and collects 7.7 g of CO₂ (44.01 g/mol), 1 : 1. What is the percent yield, to 0.1%, Esme?

  2. A lab mixes 8.4 g of baking soda (84.01 g/mol) with vinegar and collects 3.96 g of CO₂ (44.01 g/mol), 1 : 1. What is the percent yield, to 0.1%, Jun?

  3. A lab mixes 33.6 g of baking soda (84.01 g/mol) with vinegar and collects 14.96 g of CO₂ (44.01 g/mol), 1 : 1. What is the percent yield, to 0.1%, Kira?

  4. Zee says a 120% yield means the class did better than perfect. Which reply fits, Luz?

    • Disagree: over 100% points to a wet or impure product
    • Agree: a higher yield is a better yield
    • Agree: careful work can beat the theoretical yield

  5. Noah says yields fall short because reactions destroy some mass. Which reply fits, Milo?

    • Agree: each reaction destroys a little mass
    • Agree: the missing grams turn into nothing
    • Disagree: product is lost or never forms; mass stays the same

  6. A plant takes in 264.06 g of CO₂ (6 mol). Photosynthesis makes 1 mol of glucose (180.18 g) per 6 mol of CO₂. What is the theoretical yield of glucose, Pia?

    • 180.18 g, from 1 mol of glucose
    • 264.06 g, the same mass as the CO₂
    • 1081.08 g, from 6 mol of glucose

  7. That plant stores 162.16 g of glucose against the 180.18 g expected. What is the percent yield, Ren?

    • 15%, from 162.16 ÷ 1081.08 × 100
    • 90%, from 162.16 ÷ 180.18 × 100
    • 111.1%, from 180.18 ÷ 162.16 × 100

  8. Group A makes 4.18 g of an expected 4.40 g; Group B makes 8.36 g of an expected 8.80 g. Which has the higher percent yield, Zee?

    • Group A, since its sample was smaller
    • Group B, since it made more grams
    • Neither: both are 95%

  9. Group A gets 90% and Group B 70% from the same reaction. Which lost more of its product, Ari?

    • Neither, since both are under 100%
    • Group A, since its number is bigger
    • Group B, with 30% missing

  10. Group A reports 98% from damp crystals; Group B reports 91% from dry ones. Which result is more trustworthy, Bo?

    • Group A's, since its yield is higher
    • Group B's, since its crystals are dry
    • Neither, since both are under 100%
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Theoretical and percent yield

Answer Key - Grade 10 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

  1. A lab mixes 16.8 g of baking soda (84.01 g/mol) with vinegar and collects 7.7 g of CO₂ (44.01 g/mol), 1 : 1. What is the percent yield, to 0.1%, Esme?

    87.5 %

  2. A lab mixes 8.4 g of baking soda (84.01 g/mol) with vinegar and collects 3.96 g of CO₂ (44.01 g/mol), 1 : 1. What is the percent yield, to 0.1%, Jun?

    90 %

  3. A lab mixes 33.6 g of baking soda (84.01 g/mol) with vinegar and collects 14.96 g of CO₂ (44.01 g/mol), 1 : 1. What is the percent yield, to 0.1%, Kira?

    85 %

  4. Zee says a 120% yield means the class did better than perfect. Which reply fits, Luz?

    • Disagree: over 100% points to a wet or impure product
    • Agree: a higher yield is a better yield
    • Agree: careful work can beat the theoretical yield

  5. Noah says yields fall short because reactions destroy some mass. Which reply fits, Milo?

    • Agree: each reaction destroys a little mass
    • Agree: the missing grams turn into nothing
    • Disagree: product is lost or never forms; mass stays the same

  6. A plant takes in 264.06 g of CO₂ (6 mol). Photosynthesis makes 1 mol of glucose (180.18 g) per 6 mol of CO₂. What is the theoretical yield of glucose, Pia?

    • 180.18 g, from 1 mol of glucose
    • 264.06 g, the same mass as the CO₂
    • 1081.08 g, from 6 mol of glucose

  7. That plant stores 162.16 g of glucose against the 180.18 g expected. What is the percent yield, Ren?

    • 15%, from 162.16 ÷ 1081.08 × 100
    • 90%, from 162.16 ÷ 180.18 × 100
    • 111.1%, from 180.18 ÷ 162.16 × 100

  8. Group A makes 4.18 g of an expected 4.40 g; Group B makes 8.36 g of an expected 8.80 g. Which has the higher percent yield, Zee?

    • Group A, since its sample was smaller
    • Group B, since it made more grams
    • Neither: both are 95%

  9. Group A gets 90% and Group B 70% from the same reaction. Which lost more of its product, Ari?

    • Neither, since both are under 100%
    • Group A, since its number is bigger
    • Group B, with 30% missing

  10. Group A reports 98% from damp crystals; Group B reports 91% from dry ones. Which result is more trustworthy, Bo?

    • Group A's, since its yield is higher
    • Group B's, since its crystals are dry
    • Neither, since both are under 100%