Chapter 7 REVIEW Vocabulary Review On a sheet of paper, write the word or phrase from the Word Bank that completes each sentence. Word Bank absolute temperature absolute zero 1. The is the SI unit for pressure. atmosphere 2. The describes the characteristics of an ideal atmospheric gas. pressure 3. In a(n) as one quantity increases, the other quantity diffusion increases. direct proportion ideal gas 4. For a gas, is caused by collisions of gas particles with container walls. inverse proportion 5. The temperature at which all motion stops is Kelvin 6. The behavior of a(n) is described by the kinetic kinetic energy model. kinetic model partial pressure 7. 273 K and 1.00 atm are the conditions of pascal 8. When two gases flow into each other and mix, this pressure is STP 9. A(n) _ is a common unit of pressure. 10. In a(n) as one quantity increases, the other quantity decreases. 11. Energy of motion is called at sea level is 1.00 atm. 12. The 13. The temperature scale shows absolute temperature. values. 14. For gas laws involving temperature, use 15. The pressure of one gas in a mixture is a(n)
Ideal and Real Gases
Ideal gases obey conditions of the general gas laws under all states of pressure and temperature. Ideal gases are also named perfect gases. The attributes of ideal gases are as follows,
Gas Laws
Gas laws describe the ways in which volume, temperature, pressure, and other conditions correlate when matter is in a gaseous state. The very first observations about the physical properties of gases was made by Robert Boyle in 1662. Later discoveries were made by Charles, Gay-Lussac, Avogadro, and others. Eventually, these observations were combined to produce the ideal gas law.
Gaseous State
It is well known that matter exists in different forms in our surroundings. There are five known states of matter, such as solids, gases, liquids, plasma and Bose-Einstein condensate. The last two are known newly in the recent days. Thus, the detailed forms of matter studied are solids, gases and liquids. The best example of a substance that is present in different states is water. It is solid ice, gaseous vapor or steam and liquid water depending on the temperature and pressure conditions. This is due to the difference in the intermolecular forces and distances. The occurrence of three different phases is due to the difference in the two major forces, the force which tends to tightly hold molecules i.e., forces of attraction and the disruptive forces obtained from the thermal energy of molecules.
![Chapter 7 REVIEW
Vocabulary Review
On a sheet of paper, write the word or phrase from the Word
Bank that completes each sentence.
Word Bank
absolute
temperature
absolute zero
1. The
is the SI unit for pressure.
atmosphere
2. The
describes the characteristics of an ideal gas.
atmospheric
pressure
3. In a(n).
,as one quantity increases, the other quantity
diffusion
increases.
direct proportion
ideal gas
4. For a gas,
is caused by collisions of gas particles with
container walls.
inverse proportion
5. The temperature at which all motion stops is
Kelvin
kinetic energy
6. The behavior of a(n)
is described by the kinetic
model.
kinetic model
partial pressure
7. 273 K and 1.00 atm are the conditions of
pascal
8. When two gases flow into each other and mix, this
pressure
is
STP
9. A(n)
is a common unit of pressure.
10. In a(n)
as one quantity increases, the other quantity
decreases.
11. Energy of motion is called
at sea level is 1.00 atm.
12. The
13. The
temperature scale shows absolute temperature.
values.
14. For gas laws involving temperature, use
15. The pressure of one gas in a mixture is a(n)
Continued on next page
Gases
Chapter 7
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