Gases do not have a definite volume and take up all available space. They also do not have a definite shape, instead, they take the shape of their container. Due to their low densities, gases can diffuse and effuse, and they can be compressed by applying pressure due to the large empty spaces between their molecules. Gases can expand on heating or by increasing the available volume, unlike liquids and solids.
What is the main characteristic of gases in terms of volume and shape?
Gases do not have a definite volume and take the shape of the container they are in.
How do gases behave in comparison to liquids and solids in terms of density?
Gases have lower densities compared to liquids and solids, allowing them to bubble through liquids and rise up.
What happens to gases when pressure is applied to them?
Gases can be compressed by applying pressure due to the large empty spaces between their molecules.
How do gases respond to changes in temperature and volume?
Gases can expand when heated or when the available volume is increased, unlike liquids and solids.
What is the effect of sudden expansion of gases on temperature?
When gases experience sudden expansion, cooling takes place, known as the Joule Thomson effect.
What is the property of gases that allows them to occupy all available space?
a) Definite volume
b) Definite shape
c) High density
d) No definite volume
Answer: d) No definite volume
Which property of gases makes them compressible by applying pressure?
a) Strong intermolecular forces
b) Low kinetic energy
c) Large empty spaces between molecules
d) Definite shape
Answer: c) Large empty spaces between molecules
What happens to the volume of a gas when it is heated?
a) Decreases
b) Remains constant
c) Expands
d) Solidifies
Answer: c) Expands
Which effect causes cooling when gases expand suddenly?
a) Heating effect
b) Joule Thomson effect
c) Expansion effect
d) Compression effect
Answer: b) Joule Thomson effect
What is the pressure exerted by gas molecules due to their collisions with the walls of the container called?
a) Kinetic pressure
b) Static pressure
c) Gas pressure
d) Atmospheric pressure
Answer: c) Gas pressure