Dalton's law of partial pressures
Grade 10 Science Worksheet
Circle the best answer, or write your answer on the line.
Dry air at 101.325 kPa is 20.946% oxygen (NOAA). What is the partial pressure of oxygen, to 0.01 kPa, Bo?
Dry air at 101.325 kPa is 78.084% nitrogen (NOAA). What is the partial pressure of nitrogen, to 0.01 kPa, Esme?
A bike tire's air is at 300 kPa (absolute) and is 20.946% oxygen (NOAA). What is the partial pressure of oxygen, to 0.01 kPa, Jun?
A bike tire holds air at 400 kPa (absolute). About what is the partial pressure of O₂ in it, at 20.946%, Kira?
- About 83.8 kPa
- About 20.9 kPa
- About 312.3 kPa, the N₂ share
At 101.325 kPa, about what is the partial pressure of argon in dry air (0.934%), Milo?
- About 94.6 kPa, without dividing by 100
- About 0.93 kPa
- About 0.95 kPa
When humid air holds 4% water vapor, NOAA puts nitrogen at about 74.96%. Why is that below 78.084%, Pia?
- Humid air holds more nitrogen, not less
- The water vapor takes part of the total, so the other shares shrink
- Water vapor turns some nitrogen into oxygen
N₂ 79.12 kPa, O₂ 21.22 kPa, argon 0.95 kPa and CO₂ 0.04 kPa. What total do they give, Ren?
- About 100.34 kPa, leaving out argon and CO₂
- About 101.33 kPa, close to 1 atm
- About 79.12 kPa, the N₂ alone
Two tanks of the same volume and temperature each hold 2 mol of gas: one O₂, one CO₂. How do their pressures compare, Tala?
- The CO₂ tank's is higher, since CO₂ is heavier
- The O₂ tank's is higher, since O₂ moves faster
- They are equal: same moles, volume and temperature
Adding 1 mol of argon to a sealed box of 1 mol of N₂ at the same temperature does what to the total pressure, Zee?
- It rises more than double, since argon is heavier
- Nothing, since argon is a noble gas
- It doubles, since the moles double
In a gas mix, which gas has the largest partial pressure, Ari?
- The gas with the heaviest particles
- The gas with the most moles
- The gas listed first on the label