Delta H = plus 10kJ,delta S =plus 5j/k no such values exist The following reacti

Question

Delta H = plus 10kJ,delta S =plus 5j/k no such values exist The following reaction occurs spontaneously. 2H^plus (aq) plus Ca(s) rightarrow Ca^2 plus (aq) + H_2(g) Write the balanced oxidation half-reaction. How many electrons arc transferred in the following reaction? Ni plus 2HCL rightarrow Nicl_2 plus H_2 Why docs HCI not have a specific value for K, on the table of acid dissociation coolants? Write a balanced chemical equation for the overall reaction represented by the cell notation below. Mn(s) | Mn^2 plus (aq) || Zn^2 plus (aq) | Zn(s)

Explanation / Answer

29. Oxidation reaction is the reaction where electrons are lose, or in other words, passing from a lower oxidation state to a higher oxidation state.

In this reaction, the half reaction is:
Ca(s) --------> Ca2+ + 2e-
Ca lose 2 electrons, passes from 0 to 2+.

30. Ni passes from 0, to 2+ in NiCl2, while Hydrogen passes from 1+ to 0, however when the reaction is balanced, it transfered 2 electrons. Therefore, 2 electrons are transfered in the reaction:

Ni --------> Ni2+ + 2e-
2H+ + 2e- -----> H2

31. HCl does not have a Ka value because this is one of the strongest acid ever, and when it's in dissolution, all of it ions dissolve completely in water. The Ka value is a value that can say how much the ions of an acid can dissociate in water. In the case of HCl all of it's ion dissociates, that's why it does not have a dissociation constant.

32. The reaction would be:

Mn(s) + Zn2+ -------> Mn2+ + Zn(s)

Hope this helps

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