No, heating a rubber ball until it turns red hot and then allowing it to cool off should not result in a significant change in its mass.
Rubber is a type of polymer that exhibits elasticity and undergoes reversible changes when heated and cooled. When heated, the rubber ball will expand due to thermal expansion, and its volume will increase. This expansion is a result of the increased kinetic energy of the rubber molecules, causing them to move more vigorously and occupy a larger space.
While the expansion of the rubber ball might result in a slight decrease in its density due to the increased volume, the overall mass of the ball should remain relatively constant. The heating and subsequent cooling processes do not cause any significant loss or gain of mass in the rubber material itself.
It's worth noting that extreme heat could potentially cause the rubber ball to degrade or release volatile compounds, which may result in a minor loss of mass. However, under normal circumstances and within the temperature range that a rubber ball would typically encounter when turning red hot and cooling down, the change in mass should be negligible.