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Pressure is defined as the force exerted by the gas over a certain area.

Properties of Gases

If more gas particles are added to a fixed area, they will exert a greater force over that area, increasing the overall pressure. Let's first look at the affects of adding an inert gas such as. He would not take part in the reaction, so the equation can be written as. Now let's look at the affects of heat. Because the reaction is exothermic, it can be rewritten as. Since heat is a product of the reaction, increasing temperature would shift the reaction to the left.

Finally, we know that changing the volume changes the internal pressure of the system.

Properties of Gases | Chemistry | Visionlearning

We know that the affect of this change is dependent on the number of moles in the gaseous phase. If you've found an issue with this question, please let us know.


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Example Question 65 : College Chemistry. Possible Answers:. Correct answer:. Explanation : The correct answer is. Report an Error. Example Question 61 : College Chemistry. Possible Answers: C.

Example Questions

Correct answer: A. Explanation : Recall that the kinetic theory of gases states that if molecules are at the same temperature, then the mass of the molecules will determine their velocities. Key Takeaways Key Points A gas is one of the three classical states of matter the others being liquid and solid. Under standard temperature and pressure STP, or 1 atm and K , a substance which exists as a gas is called a pure gas. If the boiling point of a substance is below K, then the substance to be in gas form at STP. Interactive: Molecular View of a Gas : Explore the structure of a gas at the molecular level.

Note that unlike solids, gases do not follow a rigidly patterned structure; at a microscopic level, gases are always moving and rearranging themselves. Learning Objectives Recognize the relationship between derived and base SI units. All SI units can be derived from the seven fundamental SI units. Ranges of specific units are indicated by positive or negative multiples of powers of ten e. Pressure —the effect of a force applied to a surface—is a derived unit, obtained from combining base units.

The unit of pressure in the SI system is the pascal Pa , defined as a force of one Newton per square meter. A standardized prefix system indicates fractions and multiples of metric units e. Example 1 On a given day, the atmospheric pressure is mm Hg.

Special Properties of Gas

What is the pressure in pascals? Despite the prefix "kilo-," the kilogram is the base unit of mass. The kilogram, not the gram, is used in definitions of derived units.


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Nonetheless, units of mass are named as if the gram were the base unit. This process is called diffusion. Gas molecules are in constant motion. They exert pressure, or force per unit area, on the interior surface of their container. The pressure varies according to the amount of gas confined to a given container's volume, the temperature and the pressure. Johnson is a Los Angeles-based freelance writer and educational consultant. She specializes in writing development, test preparation and college admissions.

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