unit test

A scientist is examining a mixture of nitrogen, hydrogen, and ammonia. The individual pressures that are exerted by nitrogen and hydrogen are 0.26 atm and 0.28 atm, respectively. If the total pressure is 0.90 atm, what is the partial pressure of ammonia? Use mc016-1.jpg.

0.36 atm

What is the volume of 0.200 mol of an ideal gas at 200. kPa and 400. K? Use mc025-1.jpg and mc025-2.jpg.

3.33 L

The diagrams show the particles of a substance. Which statement best describes the process that the diagrams show?

A solid gains kinetic energy to become a liquid and then becomes a gas.

A gaseous substance turns into a solid. Which best describes this change?

A substance that has no specific volume changes to a substance that has a specific volume.

Which is a postulate of the kinetic-molecular theory?

Gas particles have a small volume relative to the spaces between them.

The volume of a gas decreases to half of its original volume, but the gas maintains the same number of moles and temperature. According to the ideal gas law, what will most likely happen to the pressure?

It will double.

Which statement best compares the melting point of butane (C4H10) with that of octane (C8H18)?

The melting point is higher for the substance that has stronger intermolecular forces.

Which statement describes a limitation of the kinetic-molecular theory for a gas?

The theory assumes that particles do not experience intermolecular forces.

Consider the temperature versus time graph below. At what temperature is the substance a heated gas?

above 100°C

Which proportionality shows the result of combining Avogadro's law with Boyle's law?

b

The diagrams show gases that are stored in two separate but similar containers. If both gases are at the same temperature, which one has the greater pressure?

gas 2 because it has more particles that are colliding

When the process of condensation occurs, the kinetic energy of particles

is insufficient to overcome intermolecular forces.

The ideal gas constant, R has several different values that could be used. Which quantity causes these differences?

pressure

Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular theory?

smaller volume mc008-6.jpg crowded particles mc008-7.jpg more collisions mc008-8.jpg higher pressure

Which quantity is held constant when working with Boyle's, Charles's, and Gay-Lussac's laws?

moles