LAB: Dry Ice Mini-Labs

True/False Indicate whether the sentence or statement is true or false.

Raisins: By themselves raisins are more dense than the Sprite -- thus, they sink.

Raisins: When CO₂ bubbles attach to the raisins, the raisins become less dense than the Sprite, therefore they float to the top.

Raisins: CO₂ is more dense than Sprite.

Balloons: The balloon inflates because the air inside is heated.

Balloons: The balloon continues to expand because hot air rises.

Candle: You can pour CO₂ because it has the same density as air.

Candle: The candle flame is extinguished because CO₂ is cold.

Candle: As you pour CO₂ you will notice that the gas is frosty white in color.

Candle: CO₂ is odorless.

Candle: The candle flame goes out because the wick gets too cold.

Film: The build up of gas inside the film canister causes pressure to increase.

Film: The top of the film canister will blow off in about 25 seconds regardless of the amount of dry ice in the container.

Movie Fog: Fog flows out of the beaker and along the table top riding “piggy back” on top of cold CO₂ gas.

Movie Fog: Fog flowing over the table top disappears because the water droplets warm up and evaporate.

Movie Fog: The amount of fog created slows down eventually. This is because the dry ice is producing less CO₂ gas.

Movie Fog: The white fog that appears is a property of CO₂ gas.

Movie Fog: Hot water is placed in the beaker because it forces the dry ice to sublimate faster.

Jet Power: The nozzle of the bottle should be closed when you are putting dry ice into the water.

Jet Power: When you turn the bottle upside down water shoots out because of gravity.

Jet Power: Bubbles made using the bubble-blowing wand are white inside because CO₂ is white.

Magnetic Bubbles: Detergent reduces the surface tension of water, allowing a flexible skin to form around the rising CO₂gas.

Magnetic Bubbles: The reason bubbles stick together is because CO₂gas is sticky.

Magnetic Bubbles: Towards the end of the bubbling, the bubbles turn clear. This is because the dry ice is running out.

Aquarium: Bubbles sink in air because they are more dense than the air around them.

Aquarium: Bubbles float in the aquarium because they are more dense than air and less dense than CO₂.

Aquarium: There is a layer of CO₂ gas in the bottom of the aquarium because CO₂ is more dense than air.

Hockey Puck: Tiny pieces of dry ice scoot around on a smooth desk top because they are cold and the desk is warm.

Hockey Puck: Small pieces of dry ice eventually disappear because they melt.

Tongs: When you grab a piece of dry ice with a pair of tongs, the tongs “sing” because the dry ice is cold.

Tongs: Warm tongs pressing against cold dry ice causes rapid sublimation directly underneath the metal. This excape of gases pushes the tongs away while hand pressure pushes the tongs back. This happens very fast and causes the tongs to vibrate.

Tongs: When metal vibrates rapidly, sound is produced.

CO2 is heavier than air and can be “poured”

CO2 fills the bottom of the beaker and snuffs out the flame because it is 1) heavier than air; and 2) it is NOT flammable.

Build-up of pressure

Water forced out under pressure

Area where greatest sublimation occurs

True/False Indicate whether the sentence or statement is true or false.
	1.	Raisins: By themselves raisins are more dense than the Sprite -- thus, they sink.
	2.	Raisins: When CO₂ bubbles attach to the raisins, the raisins become less dense than the Sprite, therefore they float to the top.
	3.	Raisins: CO₂ is more dense than Sprite.
	4.	Balloons: The balloon inflates because the air inside is heated.
	5.	Balloons: The balloon continues to expand because hot air rises.
	6.	Candle: You can pour CO₂ because it has the same density as air.
	7.	Candle: The candle flame is extinguished because CO₂ is cold.
	8.	Candle: As you pour CO₂ you will notice that the gas is frosty white in color.
	9.	Candle: CO₂ is odorless.
	10.	Candle: The candle flame goes out because the wick gets too cold.
	11.	Film: The build up of gas inside the film canister causes pressure to increase.
	12.	Film: The top of the film canister will blow off in about 25 seconds regardless of the amount of dry ice in the container.
	13.	Movie Fog: Fog flows out of the beaker and along the table top riding “piggy back” on top of cold CO₂ gas.
	14.	Movie Fog: Fog flowing over the table top disappears because the water droplets warm up and evaporate.
	15.	Movie Fog: The amount of fog created slows down eventually. This is because the dry ice is producing less CO₂ gas.
	16.	Movie Fog: The white fog that appears is a property of CO₂ gas.
	17.	Movie Fog: Hot water is placed in the beaker because it forces the dry ice to sublimate faster.
	18.	Jet Power: The nozzle of the bottle should be closed when you are putting dry ice into the water.
	19.	Jet Power: When you turn the bottle upside down water shoots out because of gravity.
	20.	Jet Power: Bubbles made using the bubble-blowing wand are white inside because CO₂ is white.
	21.	Magnetic Bubbles: Detergent reduces the surface tension of water, allowing a flexible skin to form around the rising CO₂gas.
	22.	Magnetic Bubbles: The reason bubbles stick together is because CO₂gas is sticky.
	23.	Magnetic Bubbles: Towards the end of the bubbling, the bubbles turn clear. This is because the dry ice is running out.
	24.	Aquarium: Bubbles sink in air because they are more dense than the air around them.
	25.	Aquarium: Bubbles float in the aquarium because they are more dense than air and less dense than CO₂.
	26.	Aquarium: There is a layer of CO₂ gas in the bottom of the aquarium because CO₂ is more dense than air.
	27.	Hockey Puck: Tiny pieces of dry ice scoot around on a smooth desk top because they are cold and the desk is warm.
	28.	Hockey Puck: Small pieces of dry ice eventually disappear because they melt.
	29.	Tongs: When you grab a piece of dry ice with a pair of tongs, the tongs “sing” because the dry ice is cold.
	30.	Tongs: Warm tongs pressing against cold dry ice causes rapid sublimation directly underneath the metal. This excape of gases pushes the tongs away while hand pressure pushes the tongs back. This happens very fast and causes the tongs to vibrate.
	31.	Tongs: When metal vibrates rapidly, sound is produced.
Matching

	32.	Dry ice sublimating
	33.	CO2 is heavier than air and can be “poured”
	34.	normal mix of gases
	35.	CO2 fills the bottom of the beaker and snuffs out the flame because it is 1) heavier than air; and 2) it is NOT flammable.

	36.	Dry ice pellets
	37.	Sublimation
	38.	Build-up of pressure
	39.	Water forced out under pressure

	40.	Evaporation
	41.	Dry ice pellets
	42.	Sublimation
	43.	Condensation

	44.	Most dense
	45.	Medium density
	46.	Least dense

	47.	Room temperature
	48.	Getting much colder
	49.	-109.7^o F
	50.	Area where greatest sublimation occurs