November 2011 - Chemistry Subject Test

jamesyu92
Sun, 06 Nov 2011 08:07:59 +0000

When we are collecting a gas over water, all we care is whether the gas is soluble or not; and we know we can only collect nonpolar gas because polar gas is too soluble in water. Density is definitely not an issue for water displacement; as long as the nonpolar gas is less dense than water, it will be able to rise above water and be collected. (No gas is more dense than water at normal condition)