Agalvanic (voltaic) cell consists of an electrode composed of aluminum in a 1.0 m aluminum ion solution and another electrode composed of silver in a 1.0 m silver ion solution, connected by a salt bridge. calculate the standard potential for this cell at 25 ° refer to the list of standard reduction potentials.

E° = 2.46 V

Explanation:

We have a voltaic cell of aluminum and silver in their respective solutions. To know where will take place the reduction (cathode) and where will take place the oxidation (anode), we need to compare the standard reduction potentials.

E°(Al³⁺/Al) = -1.66 V

E°(Ag⁺/Ag) = +0.80 V

Since Ag⁺/Ag has the highest reduction potential that is where reduction will take place while oxidation will take place in the Al electrode.

Reduction (cathode): Ag⁺(aq) + 1 e⁻ ⇒ Ag(s)

Oxidation (anode): Al(s) ⇒ Al³⁺(aq) + 3 e⁻

The standard potential of the cell (E°) is the difference between the reduction potential of the cathode and the reduction potential of the anode.

E° = E°red,cathode - E°red,anode = 0.80 V - (-1.66V) = 2.46 V

the answer is either b or c

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.