GCSE Chemistry – Conservation of Mass (2026/27 exams)

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*** WHAT’S COVERED ***
1. The principle of conservation of mass.
* In a chemical reaction, no atoms are created or destroyed.
* The total mass of reactants is equal to the total mass of products.
2. Demonstrating conservation of mass.
* Using the principle to balance chemical equations.
* Showing that the total relative formula mass (Mr) is the same for both reactants and products.
3. Apparent changes in mass in non-closed systems.
* Why mass may appear to increase if one of the reactants is a gas.
* Why mass may appear to decrease if one of the products is a gas.
4. Using a sealed container.
* How conducting an experiment in a sealed system allows for accurate measurement and demonstrates that mass is truly conserved.

*** CHAPTERS ***
0:00 Introduction
0:24 What Conservation of Mass Means
0:44 Conservation of Relative Formula Mass
1:11 Calculating Actual Masses
1:58 Why Mass Can Seem to Increase
2:57 Why Mass Can Seem to Decrease

*** PLAYLISTS ***

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