Directions: Read each item carefully and select the letter of the best answer. Flask Flask 3 Flask 2 Flask 4 1. Each of these flasks contains the same number of molecules of gas at the same temperature. In which container is the pressure lowest? A. Flask 1 B. Flask 2 C. Flask 3 D. Flask 4 1 atm 2 atm a atm 4 atm Flasa1 Flask 2 Flask 3 Flask 4 2. Each of these flasks is the same size and at the same temperature. Which of the following statement is truc? A Flask 1 contains the fewest molecules. B. Flasks 2 and 3 contains fewest molecules. C. Flask 4 D. All 4 flasiks contain equel number of molecules. contains the fewest molecules. 3. Which of the folowing samples of gas will bave the greatest preesure il they all have the same volume? A 10 moles at 80 C C. 10 moles at 70 °C D. 2 moles at 82 °C B. 5 moles at 81 C 4. In which condirion cen real gaa obey closely the ideal gas equation? A. preseure is very small and temperature is very high pressure is very high and temperature is very low
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.
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