Problem: Which of the following statements are evidence that gases do not always behave ideally? Check all that apply.-When two gases are mixed, they follow Dalton's law of partial pressures.-It is impossible to compress a gas enough so that it takes up no volume.-At 4 K and 1 atm, helium is a liquid.-CO2 gas becomes dry ice (solid CO2) at 1 atm and -78.5 °C.

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-When two gases are mixed, they follow Dalton's law of partial pressures.

Dalton’s law follows ideal gas laws


-It is impossible to compress a gas enough so that it takes up no volume.

volume is not negligible

not ideal


-At 4 K and 1 atm, helium is a liquid.

low temperature

not ideal


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Problem Details

Which of the following statements are evidence that gases do not always behave ideally? Check all that apply.

-When two gases are mixed, they follow Dalton's law of partial pressures.

-It is impossible to compress a gas enough so that it takes up no volume.

-At 4 K and 1 atm, helium is a liquid.

-CO2 gas becomes dry ice (solid CO2) at 1 atm and -78.5 °C.

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Based on our data, we think this problem is relevant for Professor Macaluso's class at UTA.