AP24 Q2 Class 16 (KMT, Temperature, Effusion)

Front

What happens to the average kinetic energy of gas particles when the temperature decreases?

Back

The average kinetic energy of gas particles decreases.

Front

By what factor does the average kinetic energy of gas particles decrease when cooled from 49°C to 7°C?

Back

1.15

Front

By what factor does the average speed of gas particles decrease when cooled from 49°C to 7°C?

Back

1.07

Front

What is the formula for calculating the time it takes for a gas to effuse through a barrier?

Back

Time is inversely proportional to the square root of the molar mass of the gas.

Front

If it takes 132 minutes for 1.0 L of HCl(g) to effuse, how long will it take for 1.0 L of Ne(g)?

Back

98.2 minutes.

Front

What is Graham's Law of Effusion?

Back

The rate of effusion of a gas is inversely proportional to the square root of its molar mass.

Front

If the rate of effusion of fluorine gas is 35 mL/h and an unknown gas is 23 mL/h, how do you find the molecular weight of the unknown gas?

Back

Use Graham's Law to set up the ratio of rates and solve for the unknown molecular weight.

Front

What is the molecular weight of the unknown gas if its effusion rate is 23 mL/h compared to fluorine's 35 mL/h?

Back

88 g/mol.

Front

How does temperature affect the speed of gas particles?

Back

As temperature increases, the average speed of gas particles increases.

Front

What is the relationship between temperature and average speed of gas particles at 466°C?

Back

The average speed of He atoms at a lower temperature can be calculated based on the ratio of speeds.