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examination
started: nov 23 at 9:31pm
quiz instructions
the fifth exam. this is an examination on the material
in the gases chapter of the text.
question 25 4 pts
gases behave ideally at
high temperature and low pressure
low temperature and low pressure
stp
high temperature and high pressure

Explanation:

To determine when gases behave ideally, we recall the kinetic - molecular theory of gases. For a gas to behave ideally, the volume of the gas particles themselves should be negligible compared to the volume of the container, and the intermolecular forces between the gas particles should also be negligible.

• At high temperature, the gas particles have high kinetic energy. This high kinetic energy overcomes the intermolecular forces, so the effect of intermolecular forces becomes negligible.
• At low pressure, the gas particles are far apart from each other. In this situation, the volume occupied by the gas particles themselves is a very small fraction of the total volume of the gas (the volume of the container), so the volume of the particles can be considered negligible.

Now let's analyze each option:

• Option "low temperature and low pressure": At low temperature, the kinetic energy of the gas particles is low, and intermolecular forces become significant, so gases do not behave ideally.
• Option "STP (Standard Temperature and Pressure, 0°C and 1 atm)": While some gases may approximate ideal behavior at STP, it is not the general condition for ideal gas behavior. For example, at STP, gases with strong intermolecular forces (like water vapor) do not behave ideally.
• Option "high temperature and high pressure": At high pressure, the gas particles are forced close together, so the volume of the particles is no longer negligible, and intermolecular forces also become significant.
• Option "high temperature and low pressure": This option satisfies the conditions for ideal gas behavior as explained above.

Answer:

A. high temperature and low pressure