Dalton's Law of Partial Pressures | Crash Course Quiz

Who was the first person to use real science to figure out what atoms are and how they behave?

• Albert Einstein

• Isaac Newton

• Joseph Louis Proust

• John Dalton

What law says elements combine in simple, whole number ratios of their masses?

• Law of Conservation of Mass

• Law of Definite Proportions

• Ideal Gas Law

• Law of Multiple Proportions

What is the total pressure inside a scuba tank containing 4 moles of helium and 1.1 moles of oxygen gas at 295 Kelvin?

• 1250 kilopascals

• 980 kilopascals

• 270 kilopascals

• 1.25 megapascals

What does the Law of Partial Pressures state?

• The pressure of a gas is directly proportional to the number of moles.

• Pressure is directly proportional to temperature.

• The total pressure exerted by a mixture of gases is equal to the sum of the pressures that the individual gases would exert if they were alone.

• Pressure is inversely proportional to volume.

What is the partial pressure of O2 in air at a total atmospheric pressure of 97.8 kPa, given that air is about 21% oxygen?

• 22 kilopascals

• 19.8 kilopascals

• 21 kilopascals

• 20.5 kilopascals

What happens when acetic acid reacts with sodium bicarbonate?

• It releases oxygen gas.

• It creates a solid precipitate.

• It produces helium gas.

• It forms sodium acetate, carbon dioxide, and water.

What is the vapor pressure of water at 19 degrees Celsius?

• 4.2 kilopascals

• 1.2 kilopascals

• 2.2 kilopascals

• 3.2 kilopascals

How many moles of CO2 were collected in the experiment described, if the pressure of CO2 was found to be 99.6 kilopascals at 292 Kelvin in a 0.090 liter container?

• 0.0027 moles

• 0.0057 moles

• 0.0037 moles

• 0.0047 moles

What does the Ideal Gas Law allow us to find when we know the pressure, volume, and temperature of a gas?

• The density of the gas

• The number of moles of the gas

• The number of particles in the gas

• The molar mass of the gas

What did John Dalton expand to develop the Law of Multiple Proportions?

• Law of Conservation of Energy

• Law of Definite Proportions

• Boyle's Law

• Charles's Law