Properties of Gases

Kinetic-molecular theory describes the behavior of gases in terms of particles in motion. Kinetic-Molecular Theory Gases are made from small particles separated from one another by empty space.

Kinetic-Molecular Theory Gas particles are in constant, random motion and collisions between particles are elastic. The mass and speed of gas particles determine the kinetic energy of a gas sample.

Behavior of Gases Gases have a very low density. Gases can be compressed or expanded.

Diffusion The movement of one material through another.

Gas escaping a container through a tiny opening. Effusion

Gas Behavior Recap Gases diffuse into spaces filled with other gases. At the same temperature, gases with smaller masses move faster than heavy gases. Gases effuse through small openings at measureable rates.

Gas Properties Practice 1) What does KMT assume about the size and positioning of gas particles? A)particles are large and move slowly B)particles are small and move quickly C)particles are large and far apart D)particles are small and far apart

Gas Properties Practice 2) True or False: According to KMT, gas particles are in constant, random motion. The particles lose energy when they collide with other gas particles.

Gas Properties Practice 3) Larger, slow-moving gases could have the same kinetic energy as smaller, fast-moving gases. The relationship that explains this is: A)mass/velocity = KE B)mass * velocity = KE C)½ mass * velocity = KE D)KE = m * c 2

Gas Properties Practice 4) Perfume sprayed into a room quickly spreads out until it is evenly distributed in lower concentrations than the original spray. This is based on ________ cause by ___________. A)effusion, kinetic energy B)diffusion, random particle motion C)compression, variable density

Gas Properties Practice 5) Gases escaping a container through a small opening are measured to determine their relative velocities. This process is an example of: A)effusion of gases B)diffusion of gases C)kinetic energy of gases D)compression of gases

Gas Properties Practice 6) At the same temperature, H 2 gas will move ______ Cl 2 gas. A)slower than B)the same speed C)faster than