SCIENCE 10-Gases

Which of the following describes gases correctly?

• They have fixed volume and shape

• They take the shape of their container and are highly compressible

• They are incompressible and have high density

• They have strong intermolecular forces

Why do gases have lower densities compared to solids and liquids?

• They have strong intermolecular forces

• Their particles are packed closely together

• They contain large empty spaces between molecules

• They have fixed shapes

What happens to the volume of gas when more pressure is applied?

• It increases

• It decreases

• It remains the same

• It expands indefinitely

Which of the following is an example of a gas at room temperature?

• Ice

• Water vapor

• Mercury

• Salt

What property of gases allows them to completely mix in a container?

• High density

• High intermolecular forces

• Random motion of particles

• Fixed shape

According to the Kinetic Molecular Theory, gas particles:

• Are in constant random motion

• Have strong attraction between molecules

• Move in an organized pattern

• Are stationary

Which scientist(s) developed the Kinetic Molecular Theory of gases?

• Isaac Newton

• Ludwig Boltzmann and James Clerk Maxwell

• Albert Einstein

• Dmitri Mendeleev

Which of the following is NOT a postulate of the Kinetic Molecular Theory?

• Gas particles move in random motion

• Gas particles have negligible volume

• Gas particles exert strong attractive forces

• Collisions between gas particles are elastic

What happens to the kinetic energy of gas molecules when the temperature increases?

• It decreases

• It remains constant

• It increases

• It depends on the volume of the gas

The kinetic energy of gas molecules is directly related to:

• Volume

• Pressure

• Temperature

• Mass