Exploring Phase Changes with Dry Ice

The video tutorial demonstrates a dry ice lab focusing on phase changes, specifically sublimation. It begins with an introduction to dry ice and its properties, followed by measuring its mass and calculating moles. The process of sublimation is shown by placing dry ice in water, and the resulting gas volume is calculated using the ideal gas law. The tutorial also compares the properties of carbon dioxide and air, highlighting safety considerations when handling dry ice.

What is the main focus of the dry ice lab?

• Phase changes

• Chemical reactions

• Temperature measurement

• Pressure changes

What is the molar mass of one mole of CO2?

• 44 grams

• 42 grams

• 40 grams

• 46 grams

How many grams of dry ice were weighed in the lab?

• 46 grams

• 42 grams

• 44 grams

• 40 grams

What phase change occurs when dry ice turns directly from a solid to a gas?

• Melting

• Condensation

• Sublimation

• Freezing

What is the room temperature in Kelvin during the experiment?

• 310 K

• 300 K

• 296 K

• 273 K

What is the predicted volume of gas produced from 0.9 moles of CO2 at 1 atmosphere pressure?

• 25 liters

• 15 liters

• 20 liters

• 10 liters

Why is the pressure inside the balloon higher than one atmosphere?

• Due to the volume of the flask

• Due to the elasticity of the balloon

• Due to the temperature

• Due to the amount of CO2

What is the molar mass of air?

• 29 grams per mole

• 44 grams per mole

• 32 grams per mole

• 28 grams per mole

Why is carbon dioxide considered dangerous in large amounts?

• It is flammable

• It is toxic

• It gathers in low places and can cause suffocation

• It reacts with water

How many liters of gas would be produced if 44 grams of dry ice were sublimated?

• 22.4 liters

• 26.4 liters

• 24.4 liters

• 20.4 liters