Three solid substances 'x', 'y' and 'z' are heated, the number of free surfaces of substances 'x' and 'y' decreases to zero and one respectively. The number of free surfaces of 'z' does not change. The substances assocciated with an increase in potential energy in substances is/are _________.
Dear Student,
X, Y and Z are solid substance so have any number of free surfaces.
On heating , Number of free surface for X is zero and for Y is 1. This implies on heating solid X it gets converted into gas as it has zero free surface after heating and solid Y is changes to liquid state as it has only 1 free surface.
While in Z solid the number of free surface doesn't change so it remain in solid state.
As potential energy of gas and liquid is more as compared to solid so the substances associated with an increase in potential energy in substances are X and Y.
Regards
X, Y and Z are solid substance so have any number of free surfaces.
On heating , Number of free surface for X is zero and for Y is 1. This implies on heating solid X it gets converted into gas as it has zero free surface after heating and solid Y is changes to liquid state as it has only 1 free surface.
While in Z solid the number of free surface doesn't change so it remain in solid state.
As potential energy of gas and liquid is more as compared to solid so the substances associated with an increase in potential energy in substances are X and Y.
Regards