Due Thursday
Respond to the following in a minimum of 175 words:
This week, we learn about kinetic molecular theory. Think of a common closed system, like a pot of water boiling with the lid on it. Can you think of another closed system that we experience in daily life? Describe how pressure, temperature, number of particles, and volume may change in this system. In the pot of boiling water, the temperature is often changed from the heating element of the stove. When the temperature changes, it causes other variables to change as well. Discuss these changes in your example and describe the changes to the pressure, temperature, number of particles, and volume.
Due Monday
Reply to at least 2 classmates or your faculty member. Be constructive and professional in your responses
Reply 1]
An example of a closed system that we experience in everyday life is a can of soda. Pressure, temperature, and number of particles may change in this system. An unopened can of soda is actually not bubbly yet because the pressure inside of the can keeps the carbon dioxide dissolved in the liquid. When the can is cracked open, the pressure changes, and the soda becomes carbonated as the bubbles rise to the top when the pressure in the can is released. This is because the pressure is set inside of the can, and as soon as the can is opened, pressure is released and the gas inside of the can has more space to move around (therefore moving through the liquid to make the beverage bubbly). If you were to shake a can of unopened soda, the carbon dioxide will disperse throughout the liquid prior to opening, which is why cans will often fizz and bubble over when opening. If you were to leave a can of soda unopened in a car on a very hot day, the extreme heat could potentially cause the can of soda to explode due to the pressure increasing as a result of the heat. If you were to leave a can of soda in the freezer, the liquid inside the can will expand, and can eventually lead to the can popping open as a result.
Reply2]
To Class,
One example of a closed system in daily life would be a nice hot cup of coffee with a sealed lid on it. There will be no changes in the matter within but there will be exchanges of energy. Starting at the maximum temperature, the coffee’s temperature begins to fall based on the temperature that surroundings it. Warmth and energy from the coffee is transferred to the vessel and vise versa but molecule are not changed. Within a metal or insulated vessel, the drop will be very slight (as metal conducts and retains heat), and a more drastic drop will occur if the liquid is contained in a paper or ceramic product. The number of particles remains the same as no reactants or products can escape. The volume and pressure will drop as the temperature drops. Less heat and steam from the coffee mean less pressure within. Have you ever left a plastic soda bottle outside in the heat? You can see the pressure build within, expanding the bottle as the heat of the air and liquid within rise.
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