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Describe the general properties of gases 2. Define pressure and give the SI unit for pressure 3. Convert between standard units of pressure 4. Relate the kinetic-molecular theory to the properties of an ideal gas. Gases are fluids. Fluid means any substance that can flow. Gases are able to flow because they are far apart and are able to move past each other easily.
Gases have low density. Density means the degree of compactness of a substance. Most of the volume occupied by a gas is empty space because of the large distance between gas particles.
Gases completely fill a container. A gas completely fills its container. Gas particles are constantly moving at high speeds so it expands to fill the entire volume available. Because they have weight, they exert force when colliding with objects and each other.
Collision of gas molecules are what cause gas pressure. The closer they get to the Earth, the more they collide. The more collisions, the greater the air pressure. MOLECULAR SPEED Although the molecules in a sample of gas have an average kinetic energy and therefore an average speed the individual molecules move at various speeds Some are moving fast, others relatively slowly At higher temperatures at greater fraction of the molecules are moving at higher speeds.
What pressure in Pascals is exerted if a force of Express , Pa in kPa 4. Express 40 kPa in Pa. From table 1 p. There are 4 assumptions: 1. Gases consist of particles which are separated by great distances and which posses negligible volume 2. Molecules are in continuous, rapid motion 3. Gas molecules collide with each other and with the walls of a container without any loss of energy 4.
Average kinetic energy of particles is proportional to the absolute temperature. Gases consist of particles which Gases are fluids, are separated by great distances Gases are highly compressible and which posses negligible Gases have low densities volume Molecules are in continuous, random motion.
Gases fill a container completely Gases travel in straight lines Gas particles are not all travelling at the same exact speed temperature is a measure of the average kinetic energy. Gas molecules collide with each other and with the walls of a container without any loss of energy.
Gas pressure A gas exerts pressure through the collision of its particles with itself and with the walls of its container. The pressure is increased to 1. What is the new volume of the gas? Note: it does not matter what units you use for pressure and volume, as long as they are the same for both sides of the equation. A balloon filled with helium gas has a volume of ml at a pressure of 1. That balloon is released and reaches an altitude of 6. Assuming the temperature has remained the same, what volume does the gas occupy at this height?
A gas has a pressure of 1. If the gas is compressed to a volume of 2. State Boyles Law. It is immersed in a dry-ice bath at What is its volume, assume the pressure remains constant? Note: In gas law problems always convert temperature to kelvins. The gas law equations do not work for temperatures in Celsius of Fahrenheit. Calculate the pressure in the heated can.
What law shows the mathematical relationship between volume and pressure? In Charless Law, what must remain constant in order for the law to be true? What is the relationship between temperature and pressure at a constant pressure? Identify which law is associated with each of these equations: a. The volume of gas in a syringe is What will the volume of the gas be at Open navigation menu.
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