Answer:
Explanation:
Cu²⁺ + 2e⁻ → Cu ( copper gets reduced )
Cu → Cu²⁺ + 2e⁻ ( copper gets oxidized )
Oxidation:
Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.
Reduction:
Reduction involve the gain of electron and oxidation number is decreased.
Consider the following reactions.
4KI + 2CuCl₂ → 2CuI + I₂ + 4KCl
the oxidation state of copper is changed from +2 to +1 so copper get reduced.
CO + H₂O → CO₂ + H₂
the oxidation state of carbon is +2 on reactant side and on product side it becomes +4 so carbon get oxidized.
Na₂CO₃ + H₃PO₄ → Na₂HPO₄ + CO₂ + H₂O
The oxidation state of carbon on reactant side is +4. while on product side is also +4 so it neither oxidized nor reduced.
H₂S + 2NaOH → Na₂S + 2H₂O
The oxidation sate of sulfur is -2 on reactant side and in product side it is also -2 so it neither oxidized nor reduced.
Answer:
An atom cannot be subdivided into smaller particles. (Option A).
Explanation:
According to Dalton's atomic theory: All matter is composed of tiny particles called as atoms. Some postulates of this theory are given below:
1) An atom cannot be subdivided into smaller particles it means they are indivisible.
2) Different element atoms have different masses, and chemical properties.
3) All atoms which are present in an element are identical in all respects such as mass, chemical properties, etc.
4) Atom cannot create or destroyed in a closed system.
5) The types of atoms, and relative number are constant in a given compound.
Explanation:
carbon dioxide is it gas that is present in the air plants collect carbon dioxide through tiny holes called Stomates. during the process of photosynthesis, Stomates are also used to expel a gas called oxygen. Oxygen is very important for animals like human -- we need it to breathe !
Answer:
When an organism dies or a leaf falls, it sinks into the earth's layers and decomposes. A carbon film is made when the oxygen, hydrogen and nitrogen of the organism disappear, leaving a thin layer of carbon. This process is known as distillation or carbonization.
Hope it helps!
:D
Answer: 1.0 x 10^-3M
Explanation:
The solution with pH 3 is said to be acidic because pH values less than 7 are regarded as acidic, and will produce hydrogen ions.
Mathematically, pH is expressed as
pH = -log(H+)
where H+ is the concentration of hydrogen ion
So, pH calculations are as follows
3 = -log(H+)
(H+) = Antilog (-3)
(H+) = 0.001M
Place (H+) in standard form
(H+) = 1.0 x 10^-3M
Thus, the value of hydrogen ion (H+) in the solution with pH 3 is 1.0 x 10^-3M