When water is electrolyzed, it splits into hydrogen and oxygen.
1 answer:
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Explanation:
Upon dissolution of KCl heat is generated and temperature of the solution raises.
Therefore, heat generated by dissolving 0.25 moles of KCl will be as follows.
= 4.31 kJ
or, = 4310 J (as 1 kJ = 1000 J)
Mass of solution will be the sum of mass of water and mass of KCl.
Mass of Solution = mass of water + (no. of moles of KCl × molar mass)
= 200 g +
= 200 g + 13.625 g
= 213.625 g
Relation between heat, mass and change in temperature is as follows.
Q =
where, C = specific heat of water =
Therefore, putting the given values into the above formula as follows.
Q =
4310 J =
Thus, we can conclude that rise in temperature will be .
The kinetic energy of the emitted electrons of cesium when it is exposed to UV rays of frequency is
Further Explanation:
Photoelectric effect:
When light is made to fall on any substance, electrons are emitted from it. This is known as the photoelectric effect and the emitted electrons are called photoelectrons. The electrons are emitted because of the transference of energy from light to the electrons.
Cesium is a member of the alkali metal group so it is highly reactive and shows photoelectric effect to the maximum extent. It can remove its electron so easily because of its atomic size. Due to large atomic size of cesium, its outermost electrons are held very less tightly to the nucleus and therefore removed easily.
According to the Planck-Einstein equation, the energy is proportional to the frequency and is expressed as follows:
......(1)
Here,
is the energy.
is the Plank’s constant.
is the frequency.
The frequency of UV rays is or
The value of Planck’s constant is .
Substitute these values in equation (1)
But when electrons are ejected out from the surface of the substance, all of its energy is considered as kinetic energy.
So the kinetic energy of the electrons is .
Learn more:
1. Statement about subatomic particle: brainly.com/question/3176193
2. The energy of a photon in light: brainly.com/question/7590814
Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Structure of the atom
Keywords: kinetic energy, frequency, energy, photoelectric effect, Planck's constant, light, electrons, photoelectrons, proportional, transference, reactive, cesium.