Answer is: solution B is saturated and solution A is unsaturated.
Saturated solution contains the maximum concentration of a solute dissolved in the solvent (usually water) and if extra solute is added to saturated solution, that solute will not dissolve.
Unsaturated solution means that more of a substance can be dissolved (in this example salt).
Answer:
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Explanation:
a precipitation reaction is a reaction that yields an insoluble product—a precipitate—when two solutions are mixed.
Answer:
The pressure of N₂ gas in cylinder B when compressed at constant temperature increases due to the increase in the frequency of collision between the gas molecules with themselves and with the wall of their container caused by a decrease in volume of the container.
Explanation:
Gas helps to explain the behavior of gases when one or more of either temperature, volume or pressure is varying while the other variables are kept constant.
In the gas cylinder B, the temperature of the given mass of gas is kept constant, however, the volume is decreased by pushing the movable piston farther into the cylinder. According to the gas law by Robert Boyle, the volume of a given mass of gas is inversely proportional to its pressure at constant temperature. This increase in pressure is due to the increase in the frequency of collision between the gas molecules with themselves and with the wall of their container caused by a decrease in volume of the container. As the cylinder becomes smaller, the gas molecules which were spread out further become more packed closely together, therefore, their frequency of collision increases building up pressure in the process.
Answer:
See detailed explanation.
Explanation:
Hello.
In this case, since the electron configuration of potassium whose atomic number is 19 turns out:
![K^{19}: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^1](https://tex.z-dn.net/?f=K%5E%7B19%7D%3A%201s%5E2%2C2s%5E2%2C2p%5E6%2C3s%5E2%2C3p%5E6%2C4s%5E1)
We can see that the last level is 4 which has one electron, meaning that potassium has one valence electron. Moreover, since bromine's atomic number is 35, its electron configuration is:
![Br^{35}: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^5](https://tex.z-dn.net/?f=Br%5E%7B35%7D%3A%201s%5E2%2C2s%5E2%2C2p%5E6%2C3s%5E2%2C3p%5E6%2C4s%5E2%2C3d%5E%7B10%7D%2C4p%5E5)
We can see that the last level is also 4 and it has 2+5 = 7 valence electrons. In such a way, we infer that the valence electrons are computed by the electrons at the outer or last energy level of an element.
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