The video explains that gases diffuse at different rates due to their molecular masses and densities. An experiment is described using ammonia and hydrochloric acid to demonstrate the formation of ammonium chloride. The video discusses how gases with lower molecular masses, like ammonia and hydrogen sulfide, diffuse faster than heavier gases like hydrogen chloride and sulfur dioxide. It concludes with an explanation of Brownian motion, illustrating the random movement of particles in a fluid.

What is formed when ammonia gas mixes with hydrogen chloride gas?

• Ammonium nitrate

• Ammonium chloride

• Hydrochloric acid

• Ammonia solution

Why does ammonia travel a greater distance than hydrogen chloride in the same time?

• Hydrogen chloride is lighter

• Ammonia has a higher molecular mass

• Ammonia has a lower molecular mass

• Hydrogen chloride is denser

Which gas has a lower relative molecular mass, sulfur dioxide or hydrogen sulfide?

• Neither, they are equal

• Both have the same mass

• Hydrogen sulfide

• Sulfur dioxide

What is the relative molecular mass of sulfur dioxide?

• 36.5

• 64

• 17

• 34

What causes the random movement of particles in a liquid or gas?

• Pressure differences

• Chemical reactions

• Collisions with moving water molecules

• Temperature changes

What happens to smoke particles in the air?

• They are pushed by air particles

• They sink to the ground

• They dissolve

• They remain stationary