States of Matter_6

What is the primary reason smoke from an incense stick spreads throughout a room?

• Smoke is primarily made up of gases with loosely packed molecules that move freely.

• Smoke is heavier than air and sinks to the ground.

• Smoke is lighter than air and rises to the ceiling.

• Smoke particles are attracted to walls and spread along them.

What happens to the smoke when it is transferred to a bigger bottle?

• The smoke spreads to fill the larger space.

• The smoke remains in one place.

• The smoke disappears.

• The smoke condenses into a liquid.

Who proposed the theory of Brownian motion?

• Robert Brown

• Albert Einstein

• Isaac Newton

• James Clerk Maxwell

What did Robert Brown observe in his experiment with pollen grains in water?

• The pollen grains exhibited random movement.

• The pollen grains settled at the bottom.

• The pollen grains dissolved in water.

• The pollen grains formed clusters.

Which of the following is NOT a characteristic of gases?

• Gases have a fixed shape.

• Gases have no fixed volume.

• Gases can flow more easily than liquids.

• Gases have no fixed shape.

Why can't you hold smoke in your hand?

• Because the molecules in a gas are very loosely packed and move freely.

• Because smoke is too hot to touch.

• Because smoke is too light to be held.

• Because smoke is invisible.

What is Brownian motion named after?

• Robert Brown

• Albert Brown

• James Brown

• Michael Brown

What are the properties of gases?

• Gases consist of tightly packed particles that do not move.
• Gases are incompressible and have high density.
• Gases have no fixed shape or volume, are compressible

• Gases have a definite shape and volume.

What happens to the smoke when collected in a bottle?

• The smoke disappears completely in the bottle.
• The smoke turns into a solid mass inside the bottle.
• The smoke remains unchanged and floats in the bottle.
• It moves around and fills the entire bottle.

Why does the smell of an incense stick spread throughout a room?

• Because gases spread out to fill the available space.

• The smell is caused by the heat from the incense stick.
• The smell is trapped in the incense stick until it is opened.
• The smell is released only when the incense stick is extinguished.