(1) Ni2+ + 2e---> Ni (3) Zn--> Zn2+ + 2e-
(2) Sn + 2e---> Sn2+ (4) Fe3+--> Fe2+ + e-
The thirdreaction of the zinc-releasing electron and zinc ion will occur as the half-reaction at the anode of the voltaic cell. Thus, option 3 is the correct option.
A half-reaction is a depiction of the oxidation or the reduction half of a redox reaction that involves the stating of the oxidation states and the release or the absorption of the electrons.
The anode is an electrode of the voltaic cell where the oxidation reaction takes place. The oxidation results in the loss of the electrons and hence, reactions 1 and 2 cannot occur at the anode. The fourth reaction is also not possible as iron cannot lose its electron.
Therefore, option 3. Zn → Zn²⁺ + 2e⁻ will occur at the anode.
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2. Ba2SO4
3. BaSO4
4. Ba(SO4)2
Answer:
3. BaSO4
Explanation:
the math will show you, and to answer your commented question "How does this evidence indicate that the reaction has occurred between ions ?" :
The reaction of the ions can be checked by a number of methods. In a chemical reaction, the ions are in the aqueous solution. This means that they are in solution, dissolved with charge. During the reaction (ionic) there is an attraction between the positive and negative ions. This makes a change in the state of the reactants in the products. In addition, the reaction can result in an immediate observable change such as the formation of a solid or precipitation.
(2) The Cd atom gains two electrons and its radius increases.
(3) The Cd atom loses two electrons and its radius decreases.
(4) The Cd atom loses two electrons and its radius increases.
Answer:
The bars and the gymnast's hands
Hope This Helps!
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Velocity is the displacement made per unit of time.
If direction or speed of the object change it causes change in velocity.
Acceleration is the term used for measuring the change of velocity. Acceleration is the change of velocity per unit of time.