Find the limiting reactant
Grade 10 Science Worksheet - Building Confidence
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 12 frames and 20 wheels. Each bike needs 1 frame and 2 wheels. How many bikes can be built, Kira?
In 2H₂ + O₂ → 2H₂O (an equation only), 4 mol of H₂ meets 3 mol of O₂. Which runs out first, Luz?
- The H₂: 4 mol needs just 2 mol of O₂
- Neither: 4 and 3 are close enough
- The O₂, since there is less of it
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
In 2H₂ + O₂ → 2H₂O, 6 mol of H₂ and 2 mol of O₂ react. Divide each by its coefficient. Which is limiting, Noah?
- O₂: 2 ÷ 1 = 2 is less than 6 ÷ 2 = 3
- H₂: 6 ÷ 2 = 3 is the larger result
- H₂: it has the larger coefficient
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
- Glucose: 0.5 ÷ 1 = 0.5 is less than 4 ÷ 6 = 0.67
- O₂: 4 ÷ 6 = 0.67 is the smaller result
Baking soda (0.3 mol) and vinegar acid (0.2 mol) react 1 : 1. Which is limiting, Ren?
- The baking soda, since it fizzes away
- The acid: 0.2 mol runs out at 1 : 1
- Neither: the 1 : 1 ratio means both run out
8 frames and 10 wheels make 5 bikes. How many frames are left over, Tala?
- 5 frames, one for each bike
- 3 frames
- 0 frames: each frame is used
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
Respiration: 1 mol of glucose and 3 mol of O₂ react. How much glucose is left over, Esme?
- 0.83 mol, from 1 − 1 ÷ 6
- 0.5 mol of glucose
- 0 mol: the glucose is used up