Will mark the first person to answer ! if all parts are !
a) what is the law of conservation of mass?
b) what is an every day example of the law of conservation of mass?
c) how do we see the law of conservation of mass everyday?
d) who proposed the theory of the law of conservation of mass?

Explanation:

A) what is 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 it changed from one to another form.

B) what is an every day example of the law of conservation of mass?

Burning of wood:

When wood is burn it converted into ashes, soot and gases. The mass of all these are equal to the mass of reactants i.e, oxygen and charcoal.

C) how do we see the law of conservation of mass everyday?

Burning of candle:

When candle is burn the mass of wax and oxygen is equal to the product which are carbon dioxide and water. Thus burning of candle also follow the law of conservation of mass.

Burning of wood:

When wood is burn it converted into ashes, soot and gases. The mass of all these are equal to the mass of reactants i.e, oxygen and charcoal.

D) who proposed the theory of the law of conservation of mass?

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.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

c (diamond),

sio2 (quartz)