What is the ground state shorthand notation for mercury (Hg)?
2 answers:
Explanation:
Electronic configuration is defined as the distribution of electrons in the energy levels around an atomic nucleus.
Atomic number helps in determining the electronic distribution of an atom.
We write electronic configuration according to Aufbau's principle in which shells are arranged in increasing energy levels.
Mercury (Hg) is a transition element and its atomic number is 80.
Electronic configuration of mercury is .
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Answer:
Option 3. The catalyst does not affect the enthalpy change () of a reaction.
Explanation:
As its name suggests, the enthalpy change of a reaction () is the difference between the enthalpy of the products and the reactants.
On the other hand, a catalyst speeds up a reaction because it provides an alternative reaction pathway from the reactants to the products.
In effect, a catalyst reduces the activation energy of the reaction in both directions. The reactants and products of the reaction won't change. As a result, the difference in their enthalpies won't change, either. That's the same as saying that the enthalpy change of the reaction would stay the same.
Refer to an energy profile diagram. Enthalpy change of the reaction measures the difference between the two horizontal sections. Indeed, the catalyst lowered the height of the peak. However, that did not change the height of each horizontal section or the difference between them. Hence, the enthalpy change of the reaction stayed the same.
