A) what is reactivity series? how does the reactivity series of metals help in predicting the relative activities of various metals?
b.suggest different chemical processes used for obtaining a metal from its oxides for metals in the middle of the reactivity series and metals towards the top of the reactivity series. support your answer with one example each.
Answers
Reactivity series are the sequence of reactivity of metals from higher to lower. this helps in depicting which metal will replace the other during reaction. The reactivity series is where metals are arranged in the decreasing order of their reaction with other metals.
The reactivity series is a list of metals in the order of decreasing reactivity.
there are 3 divisions in the reactivity series.They are,
* less reactive metals
*medium reactive metals
*high reactive metals.
This helps us in knowing which metal is more /less / medium reactive
Reactivity series is the arrangement of elements from top to bottom in decreasing reactivity.
Potassium comes first and platinum comes last in it
The arrangement of metals in the vertical column in the order of decreasing reactivity is called reactivity series or activity series. A metal placed above hydrogen in the activity series will displace hydrogen from water or acids. A metal placed at the top of the activity series would displace metal below it. Thus, a more reactive metal displaces a less reactive metal from its salt solution.
ANSWER:2
1. For obtaining metals that are in the middle of the reactivity series, oxides of such metals can be reduced with coke (carbon) which acts as a reducing agent.
Example:
2 Fe2O3 + 3 C ----> 4 Fe + 3 CO2
2. For obtaining metals that are high in the reactivity series, their oxides are reduced to metals by the process of electrolysis.
Example: Electrolysis of sodium chloride
At cathode: Na+ + e- -----> Na
At anode: 2 Cl- ----> Cl2 + 2e-
Answer:
1 ) .Reactivity series :
It is series of decreasing order of metals' reactivity. Hydrogen is place in middle of series. Above hydrogen metals are more reactive in nature below are less. Metal which is more reactive it displaces a less reactive metal from its salt solution.
2 ) .
In order to obtaining a metal from its oxides for metals in the middle of the reactivity series then metals towards oxides of such metals can be reduced with coke (carbon) which acts as a reducing agent.
For instance :
2 Fe₂O₃ + 3 C ⇒ 4 Fe + 3 CO₂.
In order to obtaining a metal from its oxides for metals in the high of the reactivity series their oxides are reduced to metals by the process of electrolysis
For instance :
Electrolysis of sodium chloride :
Na⁺ + e⁻ ⇒ Na [ At cathode ]
2 Cl⁻ ⇒ Cl₂ + 2 e⁻ [ At anode ]