Helium Gas Properties and Behavior

The video tutorial covers question three from the 2018 Unit 5 Physics paper. It explains the meaning of Q in the equation Q = ΔU + W, discusses the isothermal expansion of helium gas, and analyzes the effects of heating on helium gas properties. The tutorial also includes a detailed calculation of pressure changes in helium gas as temperature increases.

What does the letter 'Q' represent in the equation Q = ΔU + W?

• The temperature change

• The pressure of the gas

• The energy transferred or heat energy

• The volume of the gas

Why does the temperature of helium gas not change when a balloon is inflated slowly?

• The gas is compressed quickly

• The balloon is made of insulating material

• Energy transfer from surroundings occurs, making the process isothermal

• The gas is cooled externally

What happens to the kinetic energy of helium atoms when the gas is heated in a sealed cylinder?

• It increases

• It becomes zero

• It decreases

• It remains constant

Which of the following does NOT change when helium gas in a sealed cylinder is heated?

• Kinetic energy of atoms

• Total number of atoms

• Average density of atoms

• Volume of each atom

What is the initial temperature of helium gas in the cylinder before heating?

• 373 Kelvin

• 333 Kelvin

• 283 Kelvin

• 433 Kelvin

What is the initial pressure of the helium gas in the cylinder?

• 4 x 10^5 Pascals

• 1 x 10^5 Pascals

• 2 x 10^5 Pascals

• 3 x 10^5 Pascals

What remains constant during the heating of helium gas in the cylinder?

• Number of atoms

• Temperature

• Pressure

• Volume

What is the final temperature of the helium gas after heating?

• 433 Kelvin

• 373 Kelvin

• 333 Kelvin

• 283 Kelvin

What is the new pressure of the helium gas after the temperature increases to 333 Kelvin?

• 2.53 x 10^5 Pascals

• 1.53 x 10^5 Pascals

• 3.53 x 10^5 Pascals

• 4.53 x 10^5 Pascals

Which equation is used to calculate the new pressure of the gas?

• Boyle's Law

• Charles's Law

• Ideal Gas Law

• Avogadro's Law