Here's why:
* Mass is converted, not destroyed: When you heat a compound, you are providing energy. This energy can cause changes in the compound's state (solid to liquid, liquid to gas) or even break chemical bonds. However, the total mass of the system (compound + energy) remains constant.
* Einstein's famous equation: Einstein's equation, E=mc², demonstrates the relationship between energy and mass. It shows that mass can be converted into energy and vice versa, but the total amount of mass-energy in a closed system always remains the same.
Here are some examples to illustrate:
* Boiling water: When you heat water, it changes from liquid to gas (steam). The steam has the same mass as the original water, just in a different state.
* Burning wood: When wood burns, it combines with oxygen in the air and releases energy in the form of heat and light. The ashes, smoke, and gases produced have a slightly lower mass than the original wood, but this difference is due to the mass of the oxygen that was consumed. The total mass of the system (wood + oxygen) remains constant.
Exceptions:
While the law of conservation of mass holds true for most everyday reactions, there are exceptions in nuclear reactions where a small amount of mass can be converted into energy. This is the principle behind nuclear power and nuclear weapons.
In summary, heating a compound doesn't destroy mass. It simply changes the arrangement of atoms within the compound, and sometimes, some mass is converted into energy, but the total mass-energy of the system remains constant.
