Why chemical reactions never actually lose or gain weight
In short: In chemistry, matter is never created or destroyed—it only changes form. This video explains the principle of conservation of mass and why some experiments might trick your eyes into thinking weight is disappearing.
The fundamental principle of conservation of mass dictates that the total mass of reactants must equal the total mass of products in any chemical reaction. Because no atoms are created or destroyed during these processes, the total relative formula mass (Mr) remains constant on both sides of a balanced chemical equation.
The video explores why mass can appear to change in 'non-closed' systems, such as when a gas is produced or consumed, leading to an apparent increase or decrease in weight. By conducting experiments in a sealed container, scientists can prove that mass is truly conserved, as every atom remains trapped within the system.
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Sources
- Summary by Intellect · source: GCSE Chemistry - Conservation of Mass (2027/28 exams)
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