Gidentify the type of reaction:
fe + cucl2 ->
na2so4 + ca(no3)2 ->

what is the law of conservation of mass?

Explanation:

Chemical equation:

Fe + CuCl₂   → Cu + FeCl₂

The reaction type is single displacement reaction. In this reaction iron replace the copper and form iron(II) chloride.

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

Chemical equation;

Na₂SO₄ + Ca(NO₃)₂   →  2NaNO₃ + CaSO₄

The given reaction is type of double displacement reaction.

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AC +BD

Both reaction follow the law of conservation of mass.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.