AP24 Q2 Class 11 (IM Forces 2; Solutions w/ Energetics))

Front

What is the solubility behavior of aniline in water and why?

Back

Aniline is insoluble in water due to its hydrophobic aromatic ring, despite having an sp³ hybridized nitrogen that can participate in hydrogen bonding.

Front

Which acid can be mixed with aniline to form a solution?

Back

HBr(aq) can be mixed with aniline to form a solution.

Front

Define a volatile liquid.

Back

A volatile liquid is one that evaporates easily at relatively low temperatures.

Front

What happens to KClO3 when added to water at 70°C?

Back

At 70°C, KClO3 will dissolve in water until saturation is reached, leaving some undissolved solid if the amount exceeds solubility.

Front

How much KClO3 remains undissolved when 72 g is added to 200 g of water at 70°C?

Back

12 g of KClO3 will remain undissolved.

Front

What is the effect of cooling a saturated KClO3 solution to 30°C?

Back

Cooling the solution may require adding more water to maintain saturation and dissolve any undissolved KClO3.

Front

Compare the boiling points of CH3OH and C18H38.

Back

CH3OH has a lower normal boiling point than C18H38 because the London dispersion forces in C18H38 are stronger than the hydrogen bonding in CH3OH.

Front

What gases are primarily found in the first bubbles of boiling water?

Back

The first bubbles contain primarily N2(g) and O2(g).

Front

What gas is primarily found in the bubbles when water reaches a rolling boil?

Back

When water is boiling, the bubbles that break the surface contain primarily H2O(g).

Front

Explain the concept of hydrogen bonding and its significance in boiling points.

Back

Hydrogen bonding is a strong intermolecular force that occurs between molecules with hydrogen attached to electronegative atoms, significantly affecting boiling points.