# For the following reaction KClO4 → KCl + 2O2 Assign oxidation states to each element on each side of the equation.

## Question

For the following reaction KClO4 → KCl + 2O2 Assign oxidation states to each element on each side of the equation.

Reactant Product K Cl O Which element is oxidized? Which element is reduced?

Oxidation states number (OSN) show how many electrons gained, lost or shared during chemical reactions.

Here are some rules of oxidation state numbers.

1. OSN of 1A elements in compounds is +1
2. OSN of Oxygen in compounds is -2
3. Sum of OSN of elements equals zero in neutral compounds.
4. OSN of free elements is zero. ex. F2, N2, O2.. all have 0 OSN.

If an element loses electrons during reaction, it is oxidized. That element is called as reducing agent.

If an element gains electrons during reaction, it is reduced. That element is called as oxidizing agent.

In the given reaction, potassium perchlorate decompose into potassium chlorate and oxygen.

a) KClO4.
K (potassium) is 1A element, OSN +1,
Oxygen in the compound has OSN -2.
Let OSN of Cl be x
1+ x+(4*-2)=0 (since compound is neutral)
Solve the equation. X is equal to +7.

b)Potassium perchlorate is the reactant, Potassium chloride and Oxygen are the products.
Reactants —–> Products

c) Check out change of OSN of elements.
in KCl, OSN number of K is +1, Cl is -1. So Cl+7—->Cl-1. It takes 8 electrons. It was reduced.
in KClO4, OSN number of O is -2, in O2 it becomes O. So O-2—->O. It gives electrons. It was oxidized.
Shortly,
LOSS OF ELECTRONS=OXIDIZED
GAIN OF ELECTRONS=REDUCED

### Which description correctly characterizes the acidity or basicity of a solution?

Question Which description correctly characterizes the acidity or basicity of a solution? The higher the pH is, the more the hydroxide ion concentration decreases and…

### Iron reacts with oxygen in a chemical hand-warmer. how should this reaction be categorized?

Question Iron reacts with oxygen in a chemical hand-warmer. how should this reaction be categorized? As an exothermic process because it releases heat as an…

### A compound is 54.53 % C , 9.15 % H , and 36.32 % O by mass.

Question A compound is 54.53 % C , 9.15 % H , and 36.32 % O by mass. What is its empirical formula? Insert subscripts…

### How many electrons in an atom could have these sets of quantum numbers?

Question How many electrons in an atom could have these sets of quantum numbers? n = 3 n = 5 , ℓ = 1 n…

### What is the value of K for this aqueous reaction at 298 K?

Question What is the value of K for this aqueous reaction at 298 K? A + B <—–> C + D   Delta G = 26.81…

### The specific heat of water is 4.18 J/(g⋅∘ c. Calculate the molar heat capacity of water.

Question The specific heat of water is 4.18 J/(g⋅∘c. Calculate the molar heat capacity of water. Answer #1 We are given that the specific heat…