What is the correct way to show sodium chloride in aqueous solution? A.NaCl (s) B.NaCl (w) C.NaCl (as) D.NaCl (aq)
2 answers:
Answer: D.NaCl (aq)
Explanation: In Sodium chloride
Sodium atom has oxidation number of +1.
Electronic configuration of sodium:
Sodium atom will loose one electron to gain noble gas configuration and form sodium cation with +1 charge.
Chlorine atom has oxidation number of -1.
Electronic configuration of sodium:
Chlorine atom will gain one electron to gain noble gas configuration and form chloride ion with -1 charge.
In sodium chloride the one electron from sodium metal gets transferred to chlorine atom to form ionic compound.
Ionic compounds dissociate to give ions when dissolved in water and thus are written as NaCl (aq).
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Answer:
Usually give off heat energy
Explanation:
Exergonic reactions are the ones which are spontaneous. Spontaneous reactions are indicated by the negative change in the Gibbs free energy. In order to provide characteristics for an exergonic reaction, we need to define the Gibbs free energy in terms of the enthalpy change and the entropy change:
Here:
is the enthalpy change;
is the entropy change;
is the absolute temperature.
In order to achieve a negative value in the Gibbs free energy change, we should have:
This is true for all temperatures if:
The major term here is the change in enthalpy, notice that we wish the enthalpy change to be negative.
Negative enthalpy change corresponds to an exothermic reaction, the one which releases heat. This means exergonic reactions would usually give off heat.