Review sheet for gas laws

Assume the volume of the container is constant.

Review sheet for gas laws

All of the gas laws rely on some basic assumptions that are made about gases, and together they constitute what it means for a gas to be in an ideal state.


In an ideal state All gas particles are in constant, random motion. All collisions between gas particles are perfectly elastic meaning that the kinetic energy of the system is conserved.

The volume of the gas molecules in a gas is negligible. Gases have no intermolecular attractive or repulsive forces. The average kinetic energy of the gas is directly proportional to its Kelvin temperature and is the same for all gases at a specified temperature.

Only four measurable properties are used to describe a gas: The quantity amount of the gas is usually expressed in moles n. The temperature, T, of gases must always be converted to the Kelvin temperature scale the absolute temperature scale.

The volume, V, of a gas is usually given in liters. Finally, the pressure, P, of a gas is usually expressed in atmospheres. Example Which of the following statements is not true of ideal gases? The volume occupied by gas particles is only significant at very low pressures.

Gas molecules occupy an insignificant volume compared to the volume of the container that holds them. The particles of a gas move in random straight line paths until a collision occurs. The collisions that occur between gas particles are considered elastic. At a given temperature, all gas molecules within a sample possess the same average kinetic energy.

Explanation In this example, choice 1 is incorrect. Choices 2, 3, 4, and 5 all describe an ideal gas. Choice 1 makes an incorrect assumption: The volume only becomes significant if gas particles collide often, increasing the chances that intermolecular forces will hold them together.

Measuring the Pressure of a Gas Gas pressure is a gauge of the number and force of collisions between gas particles and the walls of the container that holds them.

The SI unit for pressure is the pascal Pabut other pressure terms include atmospheres atmsmillimeters of mercury mmHgand torr. The following is a list of all of the standard pressure in every unit for pressure. Memorize these for the exam so you can convert units where necessary:Mixed Gas Laws Worksheet 1) How many moles of gas occupy 98 L at a pressure of atmospheres and a temperature of K?

2) If moles of O 2 and moles of N 2 0are placed in a L tank at a temperature of 25 C, what will the pressure of the resulting mixture of gases be?

Review sheet for gas laws

GHS Honors Chemistry Unit IX: Gas Laws Review Sheet (Chapter 12) 1. Describe the motion of particles of a gas according to the kinetic theory.

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