Answer: E = - 19.611×
J
Explanation: The lowest possible energy can be calculated using the formula:
where:
Z is atomic number of the atom;
k is a constant which contains other constants and is 2.179× J
n is a layer;
For the lowest possible, n=1.
Atom of Lithium has atomic number of Z=3
Substituing:
J
<u>The energy for the electron in the </u>
<u> ion is - 19.611 joules</u>
Answer : The mixture of acetone and alpha naphthol can be separated using simple distillation method.
Explanation :
The melting point of alpha naphthol is around 95 °C whereas boiling point of acetone is around 55°C. Therefore the mixture can be separated using simple distillation method.
In this method, the mixture is taken in a stoppered bottle which has a tube inserted through the stopper for passing the vapors .The container is gently heated. Acetone being volatile, gets converted to vapors at its boiling point. Since melting point of alpha naphthol is much higher than the boiling point of acetone, it remains in dissolved form and does not melt when the mixture is heated.
The vapors of acetone are passed through the tube and as they pass through the tube, they get condensed. The condensed liquid is collected in another container.
After all the acetone is evaporated, solid alpha naphthol is left at the bottom of the container.
In this manner, the mixture of acetone and alpha naphthol is separated.
The thing that governs whether a reaction is exothermic is the energy given out / used up to break / form the bonds in the reaction.
<span>When two substances react, the bonds in those substances first break up, releasing energy, before re-forming in a different way, taking in energy. The nature of the bonds that are broken up and reformed determines whether more energy is given out (exothermic) or taken in (endothermic)</span>
<em></em>hydrogen #1 carbon #6 nitrogen #7 oxygen #8 Phosphorus #15 Sulfur #16 Selenium #34
