Kinetic Model of Particles

Which of the following properties cannot be explained by the kinetic theory of particle?

• Density
• Compressibility 
• Shape
• Colour

Which of the following is not a property of a solid?

• It expands a little when heated compared to a liquid
• It takes any shape of a container
• It is not easy to be compressed
• It usually has a higher density than a gas

What would be the change when heat is supplied to a gas?

• The particles in the matter expand tremendously.
• The particles move randomly in all directions.
• The average kinetic energy of the particles increases.
• The particles contract and occupy lesser space.

Which of the following statements explains the Brownian motion of smoke particles?

• It is the collision between the smoke particles.
• It is the collision between the smoke particles and the wall of a container.
• It is the collision between the smoke particles and air particles.
• It is the collision between the smoke particles and the light.

When ice melts into water,

• the intermolecular force weakens and the molecules move slower.
• the intermolecular force weakens and the speed of molecules increases
• the intermolecular force becomes stronger and the molecules move faster.
• the intermolecular force becomes stronger and the speed of the molecules decreases.

A crystal of purple potassium manganate(VII) was added to each of the beakers shown in the diagram.

One beaker contained hot water and the other beaker contained cold water. In both beakers the purple colour of the potassium manganate(VII) spreads out. Which result and explanation are correct?

• result - colour spreads faster in cold water

  explanation - particles move faster at a higher temperature

• result - colour spreads faster in cold water

  explanation - particles move slower at a higher temperature

• result - colour spreads faster in hot water

  explanation - particles move faster at a higher temperature

• result - colour spreads faster in hot water

  explanation - particles move slower at a higher temperature

Which change of state takes place during evaporation?

• gas to liquid

• liquid to gas

• solid to gas

• liquid to solid

Kuku just made himself a cup of hot tea.

Which row describes the water particles in the air above the cup compared with the water particles in the cup?

• A

• B

• C

• D

A bottle of aqueous ammonia is placed on a table in a corner of the laboratory. The stopper is removed and after a few minutes all the students in the room can smell the ammonia. Which process occurs?

• Brownian motion

• diffusion

• dissolving

• distillation

A student investigated the diffusion of ammonia gas, NH₃, and hydrogen chloride gas, HCl. Two sets of apparatus were set up as shown at room temperature and pressure.

• 64 seconds

• 30 seconds

• 21 seconds

• The blue litmus paper would not change colour.