Why is it important to performance activity in a closed system to prove the law of conservation of mass?Explain with example.
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Answer:
the law of conservation of mass states that mass can neither be created nor be destroyed. If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system. weigh a test tube.
Imagine you enter a closed system, a room that is perfectly sealed where nothing can enter the room and nothing can escape. In this closed system, you light a candle and let it burn, watching as some of the wax seems to disappear as the flame travels down the wick. Where does the wax go? Is it truly disappearing?
The law of conservation of mass states that in a closed system, the mass of the system cannot change over time. Look at our example of the candle in the closed room. Though much of the wax itself is no longer present in its original form, all of the mass of the wax is still present in the room, albeit in a different form.
When the flame was lit, oxygen gas from the room reacted with the candle wax to produce water vapor and carbon dioxide gas. If you massed the reactants oxygen and wax, it would equal the mass of the products water and carbon dioxide. We can remember the law of conservation of mass with this simple statement:
The mass of the reactants must equal the mass of the products.
Sadly for fans of magic, anything that has mass, including matter and energy, cannot be created or destroyed. That means, mass cannot simply appear out of nowhere and equally it cannot disappear. Matter may change forms however, giving the illusion of nothing out of something or vice versa, but the mass of the matter is always the same before and after the change. If 22 grams of reactants go into a chemical reaction, then 22 grams of products must be produced.