Understanding Boiling Points and Phase Changes

The video explores how pressure affects the boiling point of substances, demonstrating that water can boil at room temperature by reducing pressure. This process cools the water as faster molecules escape. The same principle is applied to nitrogen, where reducing pressure leads to the formation of solid nitrogen. Finally, the video shows how solid carbon dioxide, or dry ice, can be formed by cooling the surface of a water bath, causing CO2 to condense from the atmosphere.

What is the boiling point of water at 1 atmosphere of pressure?

• 120 degrees Celsius

• 110 degrees Celsius

• 100 degrees Celsius

• 90 degrees Celsius

How can water be made to boil at room temperature?

• By adding salt

• By heating it to 100 degrees Celsius

• By reducing the pressure

• By increasing the pressure

What happens to the temperature of water when it boils at room temperature?

• It increases

• It fluctuates

• It remains the same

• It decreases

What is the approximate temperature of liquid nitrogen?

• -196 degrees Celsius

• -100 degrees Celsius

• -273 degrees Celsius

• 0 degrees Celsius

What process is used to freeze nitrogen?

• Adding pressure

• Removing fast-moving molecules

• Mixing with water

• Heating it

What is the triple point of a substance?

• The point where it is only solid

• The point where it can exist as solid, liquid, and gas

• The point where it is only gas

• The point where it is only liquid

What happens to the ice when the pressure is reduced in the chamber?

• It melts

• It evaporates

• It gets sucked up

• It remains unchanged

What is formed when solid nitrogen is poured onto a water bath?

• Liquid carbon dioxide

• Solid carbon dioxide

• Solid oxygen

• Liquid nitrogen

What is another name for solid carbon dioxide?

• Dry ice

• Wet ice

• Cold gas

• Frozen air

What causes carbon dioxide to condense out of the atmosphere in the experiment?

• High pressure

• High temperature

• Low pressure

• Low temperature