CLASS 7 · LEARNING KNOWLEDGE
Conservation of Mass – Basic Principles and Applications
How it works
The law of conservation of mass states that in a chemical reaction in a closed system, the total mass of all substances involved remains the same. Mass is neither created nor destroyed. If, however, only an open part is considered, the measured mass can increase or decrease because substances escape or are absorbed from the surroundings. Conservation of mass is an important basis for understanding chemical reactions and for simple calculations.
Note
In a closed system, the total mass is conserved in chemical reactions because atoms are only rearranged, but not destroyed or created.
In a closed system, the total mass is conserved in chemical reactions because atoms are only rearranged, but not destroyed or created.
An example
In a closed vessel, 5 g iron react with 3 g sulfur. What is the total mass in the vessel after the reaction?
The total mass in the vessel is 8 g. In a closed system, mass is conserved, so 5 g + 3 g = 8 g.
Try it yourself now
50 Exercises
To the learning unit →Own explanation and own practice exercises by AmyMath. Subject reference framework: Chemistry. The topic assignment may vary by federal state.