Kinetic Particle Theory: Practice Questions

Under the same conditions of temperature and pressure, which of the following gases diffuses the fastest?

(Relative atomic masses: \(H = 1\), \(C = 12\), \(N = 14\), \(O = 16\), \(S = 32\), \(Cl = 35.5\))

During the melting of a pure solid substance, the temperature remains constant even though heat is continually supplied. What is the reason for this?

Two identical glass tubes are set up to compare the rates of diffusion of two unknown gases, Gas X and Gas Y, under the same conditions. Gas X has a relative molecular mass of \( 16 \) and Gas Y has a relative molecular mass of \( 64 \). How does the rate of diffusion of Gas X compare to that of Gas Y?

Which observation provides the best direct evidence for the continuous random movement of particles in gases?

A substance \(X\) has a melting point of \(-7^\circ\text{C}\) and a boiling point of \(59^\circ\text{C}\). At \(25^\circ\text{C}\), what are the physical state and the relative kinetic energy of the particles of \(X\) compared to its state at \(70^\circ\text{C}\)?

Name the phase change process by which a substance transforms directly from a gas to a solid.

Gas A has a relative molecular mass of \( 16 \) and gas B has a relative molecular mass of \( 64 \). Compare their rates of diffusion at the same temperature and explain the reason for the difference.

Describe what happens to the average kinetic energy and movement of water molecules when liquid water is cooled from \(50\,^{\circ}\text{C}\) to \(15\,^{\circ}\text{C}\).

Explain why a sealed inflated balloon decreases in size slowly over a few days even though there are no visible holes in the rubber.