SCH3U: Ideal Gas Law (Crash Course Video)

Abby and Georgia are conducting an experiment with a balloon. They notice that when they squeeze the balloon, the pressure inside increases while the volume decreases. What law explains this observation?

• Volume divided by the number of moles equals a constant at constant pressure and temperature.

• Volume divided by temperature equals a constant at constant pressure.

• Pressure times temperature equals a constant at constant volume.

• Pressure times volume equals a constant at constant temperature and amount of gas.

Answer explanation

Pressure times volume equals a constant at constant temperature and amount of gas.

Which scientist's work laid the foundation for Boyle's Law?

• Henry Power

• Richard Towneley

• Robert Boyle

• Jacques Charles

Answer explanation

Richard Towneley's work laid the foundation for Boyle's Law, not Robert Boyle himself. Towneley's experiments on air pressure were crucial for the development of Boyle's Law.

What does the Ideal Gas Law equation state?

• P T = n R V

• P V = R T

• P V = n R T

• P V = n T

Answer explanation

The Ideal Gas Law equation states that the product of pressure (P) and volume (V) is equal to the product of the number of moles (n), the ideal gas constant (R), and the temperature (T), which is represented as PV = nRT.

During a lab activity, Aron and Devon are measuring the pressure of a gas in a container. What is the unit of pressure commonly used in the Ideal Gas Law?

• Liters

• Newtons

• Pascals

• Joules

Answer explanation

The unit of pressure commonly used in the Ideal Gas Law is Pascals.

Zoey is conducting an experiment in her chemistry class. She uses the Ideal Gas Law to determine a certain variable. What does the variable 'n' represent in the Ideal Gas Law?

• Volume

• Number of moles

• Pressure

• Temperature

Answer explanation

The variable 'n' in the Ideal Gas Law represents the Number of moles.

What is the value of the Universal Gas Constant 'R'?

• 8.3145 liters kilopascal per kelvin mole

• 22.4 liters per mole

• 101325 pascals

• 0 degrees Celsius

Answer explanation

The value of the Universal Gas Constant 'R' is 8.3145 liters kilopascal per kelvin mole, as it is a fundamental constant in chemistry and physics.

In the video, Hank squeezes the balloonm applying external pressure and, thereby, decreasing the volume of gas inside.

What happens to the pressure inside the balloon if the volume decreases?

• The pressure increases.

• The pressure fluctuates.

• The pressure decreases.

• The pressure remains the same.

Answer explanation

When the volume of gas inside the balloon decreases, the pressure increases due to the gas molecules being more compressed in a smaller space.

Noah and Ewan are discussing temperatures in their science class. What is the temperature at which all movement of particles stops?

• 0 degrees Celsius

• Standard temperature

• 100 degrees Celsius

• Absolute zero

Answer explanation

The temperature at which all movement of particles stops is Absolute zero.

What does the acronym STP stand for in chemistry? What conditions does STP refer to?

• Standard Temperature and Pascals; it refers to conditions at room temperature

• Standard Time and Pressure; it refers to the point at which all movement of gas particles stops.

• Standard Time and Pascals; it refers to the amount (mols) of a gas.

• Standard Temperature and Pressure; it refers to conditions at 0^oC and 1atm.

Answer explanation

Standard Temperature and Pressure; it refers to conditions at 0°C and 1atm.

The pressure here on Earth at sea level, that we call one (1) atmosphere or 1 atm, is approximately:

• 101325 newtons

• 101325 kilopascals

• 100 pascals

• 100 kilopascals

Answer explanation

The correct pressure at sea level on Earth, known as 1 atmosphere, is approximately 100 kilopascals.