Grade 10 · Science · Chemistry

10th grade Find the limiting reactant worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

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Find the limiting reactant

Grade 10 Science Worksheet - Building Confidence

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

A bike shop has 8 frames and 10 wheels. Each bike needs 1 frame and 2 wheels. How many bikes can be built, Ari?
A bike shop has 9 frames and 14 wheels. Each bike needs 1 frame and 2 wheels. How many bikes can be built, Bo?
A bike shop has 12 frames and 20 wheels. Each bike needs 1 frame and 2 wheels. How many bikes can be built, Kira?
4.
With 8 frames and 10 wheels, and 1 frame + 2 wheels per bike, which part runs out first, Jun?
- The wheels: 10 wheels make 5 bikes
- Neither: they run out together
- The frames, since there are fewer of them
5.
In 2H₂ + O₂ → 2H₂O (an equation only), 4 mol of H₂ meets 3 mol of O₂. Which runs out first, Luz?
- The O₂, since there is less of it
- The H₂: 4 mol needs just 2 mol of O₂
- Neither: 4 and 3 are close enough
6.
Respiration: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O. 1 mol of glucose meets 3 mol of O₂. Which runs out first, Milo?
- The glucose, since there is less of it
- Neither: each has some left
- The O₂: 1 mol of glucose needs 6 mol
7.
In respiration (1 glucose : 6 O₂), 0.5 mol of glucose and 4 mol of O₂ react. Which is limiting, Pia?
- Neither: there is enough of both
- O₂: 4 ÷ 6 = 0.67 is the smaller result
- Glucose: 0.5 ÷ 1 = 0.5 is less than 4 ÷ 6 = 0.67
8.
Baking soda (0.3 mol) and vinegar acid (0.2 mol) react 1 : 1. Which is limiting, Ren?
- The acid: 0.2 mol runs out at 1 : 1
- The baking soda, since it fizzes away
- Neither: the 1 : 1 ratio means both run out
9.
In 2H₂ + O₂ → 2H₂O, 4 mol of H₂ and 3 mol of O₂ react. How much O₂ is left over, Zee?
- 1 mol of O₂
- 3 mol of O₂, as the O₂ does not react
- 0 mol: both are used up
10.
Respiration: 1 mol of glucose and 3 mol of O₂ react. How much glucose is left over, Esme?
- 0 mol: the glucose is used up
- 0.83 mol, from 1 − 1 ÷ 6
- 0.5 mol of glucose

10th grade Find the limiting reactant worksheet – printable — Print: 1 2 3 4 5 6

About this worksheet

Find the limiting reactant. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

I can find the limiting reactant by dividing each reactant's moles by its coefficient.
I can use the limiting reactant, not the one in excess, to find how much product forms.
I can find how much of the excess reactant is left over, and why grams alone can't decide.

Standard: HS-PS1-7

Words to know

limiting reactant: The reactant that runs out first and sets the product

excess reactant: The reactant left over when the reaction stops

leftover: What you had minus what the limiting reactant uses

Common mistakes

Your child picked the smaller amount. Compare each amount with what the recipe or equation needs: divide by how many each product uses.

Your child compared grams. Change grams to moles before comparing; light molecules give many moles per gram.

Your child used the reactant in excess. The product depends on the reactant that runs out first.

Questions parents ask

What is the most common mistake with find the limiting reactant?

Your child picked the smaller amount. Compare each amount with what the recipe or equation needs: divide by how many each product uses.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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