7.1.1
Outline the characteristics of chemical and physical systems in a state of equilibrium.
Equilibrium is the when the products and reactants are at a constant ratio. The state of forward and backward reaction are at the same rate.
Physical System
At room temperature, a bottle of Bromine( a liquid at room temperature) is sealed. Because Bromine is a volatile liquid, its boiling point is close to room temperature.
Some Bromine particles will have enough energy to vaporize, at the same time, the vaporized particles will collide with the surface of the liquid, allowing it to lose energy and become liquid. Because the rate of evaporation is equal to the rate of condensation, there is no net change in the amount of liquid and gas present. So, the system has reached equilibrium
Chemical System
Iodine releases a purple gas, and Hydrogen and Hydrogen Iodide are both colorless.
If an experiment is carried out with Hydrogen Iodide in a sealed container. There will be an increase in the color purple, but after a while, the increase in the color will stop. It may seem that the reaction has stopped too, however, what actually happened is that the rate of dissociation of Hydrogen Iodide has become equal to the reverse rate of reaction of the association of Hydrogen gas and Iodine gas.
Therefore equilibrium has been reached. There is no net change observed even though both reactions are taking place.
A experiment was carried out in class to prove that Copper Sulfate (CuS04) goes through a state of equilibrium at room temperate.
- The piece of hydrous copper sulfate was taken from a sealed bottle (as seen in the picture, the copper sulfate is very blue)
-The piece of copper sulfate was then heated under a bunsen burner
-After heating the hydrous copper sulfate for a while, the copper sulfate became white
- The copper sulfate was then left alone for a while
- The copper sulfate started to change color for white to blue, proving that the water from the atmosphere was absorbed back into the copper sulfate.
It is proven that at room temperature, when hydrous copper sulfate is left alone, it is at a state of equilibrium. Because after it is heated, the copper sulfate will start absorbing the water from the atmosphere, but when left alone, the color does not change.
Outline the characteristics of chemical and physical systems in a state of equilibrium.
Equilibrium is the when the products and reactants are at a constant ratio. The state of forward and backward reaction are at the same rate.
Physical System
At room temperature, a bottle of Bromine( a liquid at room temperature) is sealed. Because Bromine is a volatile liquid, its boiling point is close to room temperature.
Chemical System
Iodine releases a purple gas, and Hydrogen and Hydrogen Iodide are both colorless.
If an experiment is carried out with Hydrogen Iodide in a sealed container. There will be an increase in the color purple, but after a while, the increase in the color will stop. It may seem that the reaction has stopped too, however, what actually happened is that the rate of dissociation of Hydrogen Iodide has become equal to the reverse rate of reaction of the association of Hydrogen gas and Iodine gas.
Therefore equilibrium has been reached. There is no net change observed even though both reactions are taking place.
A experiment was carried out in class to prove that Copper Sulfate (CuS04) goes through a state of equilibrium at room temperate.
 |
| Before the experiment |
- The piece of hydrous copper sulfate was taken from a sealed bottle (as seen in the picture, the copper sulfate is very blue)
-The piece of copper sulfate was then heated under a bunsen burner
-After heating the hydrous copper sulfate for a while, the copper sulfate became white
- The copper sulfate was then left alone for a while
- The copper sulfate started to change color for white to blue, proving that the water from the atmosphere was absorbed back into the copper sulfate.
 |
| After Heating the Copper Sul |
7.1.1 Thanks Su-May - I would have liked to have seen images of the experiment you did in class and some reference to it in your blog
ReplyDelete