Oxygen weighing 0.1 kg occupies a volume of 200 liters at a temperature of 200 K. What pressure does this state of gas correspond to?

• Р=0,26 mPa

• P=0 Pa

• P=2,66 kPa

• P=26 kPa

• P=390 kPa

What happens to the pressure of a gas when the root mean square speed of its molecules decreases?

• pressure increases

• pressure decreases

• pressure does not change

• pressure does not depend on speed

• will increase threefold

How will the energy of gas molecules change if the temperature doubles:

• will not change

• will increase 2 times

• will decrease by 2 times

• will increase 4 times

• will decrease by 4 times

How will the density of an ideal gas change when it is cooled isobarically?

• decrease

• won't change

• there is not enough data to answer the question

• can change in any way

• will increase

The mass of hydrogen gas in the vessel is 4 g. Approximately how many hydrogen molecules are in the vessel?

• 10^ 23

• 4*10^23

• 2*10^-23

• 12*10^23

• 10^-23

How will the root mean square speed of nitrogen molecules change if the temperature of the gas increases 4 times?

• will increase 2 times

• will decrease by 4 times

• will increase 4 times

• will decrease by 2 times

• will not change

What causes Brownian motion?

• collision of particles suspended in a liquid (or gas)

• collision of liquid (or gas) molecules with each other

• collision of molecules of a liquid (or gas) with particles suspended in it

• thermal movement of liquid particles

• none of the above reasons

A vessel with a capacity of 0.83 m 3 contains helium. Gas mass 0.16 kg. At what temperature does helium exert a pressure of 60 kPa on the walls of the vessel?

• T=300°C

• T= 300K

• T=150°C

• 150K

• T= 2,4•10~3K

Estimate approximately the mass of 1 m*3 of air at normal atmospheric pressure and temperature 300 K. Select from the values below the closest to the result you obtained.

• 10 g

• 100g

• 1g

• 1kg

• 10kg

If a gas is under normal conditions, then its pressure and temperature are equal:

• P= 0, T= 273 K

• P= 0 Pa, t=0° C

• P=10~5 Pa, T= 0 K

• P= 100 kPa, T= 273 K

• P= 1 atm, temperature could be any