Understanding the van der Waals Equation

Understanding the van der Waals Equation

Assessment

Interactive Video

Chemistry

11th - 12th Grade

Hard

Created by

Olivia Brooks

FREE Resource

Professor Dave discusses non-ideal gases, highlighting the assumptions made in kinetic molecular theory and ideal gas laws. He explains that these assumptions fail under high pressure and low temperature, leading to non-ideal behavior. The van der Waals equation is introduced as a more accurate model, incorporating correction factors for particle attraction and volume. A comparison of calculations using both the ideal gas law and van der Waals equation is provided, demonstrating the latter's accuracy under non-ideal conditions.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is one assumption made about particles in the kinetic molecular theory of ideal gases?

They have a fixed shape.

They are dimensionless points.

They have a measurable volume.

They interact with each other.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Under what condition does the volume of gas particles become significant?

When the gas is at high temperature.

When the gas is at low pressure.

When the gas is compressed.

When the gas is in a vacuum.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the van der Waals equation adjust in the ideal gas law?

Volume and temperature.

Temperature and pressure.

Pressure and volume.

Moles and temperature.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the constant 'A' in the van der Waals equation represent?

The volume of the gas.

The size of the gas particles.

The strength of attraction between gas particles.

The temperature of the gas.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the van der Waals equation, what does the term 'V - NB' account for?

The temperature of the gas.

The number of moles of gas.

The pressure of the gas.

The volume occupied by gas particles.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the pressure of a gas sample calculated using the ideal gas law in the example?

32.4 atmospheres

35.7 atmospheres

33.5 atmospheres

34.6 atmospheres

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does the van der Waals equation result compare to the ideal gas law in the example?

It is significantly higher.

It is slightly lower.

It is the same.

It is significantly lower.

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