Mass conservation, dissolution, fusion, molecular representation, solid state, liquid state, dissolved state
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Abstract
This document explores the concept of mass conservation during the dissolution of sugar in water, highlighting the importance of molecular representation and the rearrangement of molecules during fusion. Written for a chemistry or physics course, this analysis delves into the principles of mass conservation and the characteristics of the solid, liquid, and dissolved states.
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[...] This is called fusion. During a fusion, the mass remains unchanged. In fact, in the solid state, molecules form crystals that hold together due to molecular bonds. In the liquid state, the molecules move relative to each other but their number remains the same. Fusion corresponds to a rearrangement of the molecules among themselves. But the number of molecules in the beaker remains the same between figure 1 and figure 2. The balance will therefore indicate 135.9 g on figure 2. [...]
[...] In fact, there is conservation of mass during a dissolution. The sugar passes from the solid state to the dissolved state. But the number of sugar molecules does not change. To know the mass after dissolution, it is therefore sufficient to make the sum of the mass of sugar with the mass of water. The molecular representation that models the total dissolution of sugar in water is representation 2. In fact, on this last one, we can see that the sugar molecules (small triangles) and water molecules (other symbol) are dissociated from each other and mixed in a homogeneous manner in the beaker. [...]
