# One to a too heavy subtraction from the energy

One major problem we encountered while doing this lab were the numerous possibilities which would lead to heat loss. In theory, this lab should be performed in a closed system in order to prevent heat loss which was not the case in ouïr methodology. Furthermore, in order for our calculations to take place we must assume that the energy lost is equal to the energy gained in addition with the latent heat. Unfortunately, that was not the case for our experiment. Hence realistically our equation should have been the following: Latent Heat of Fusion + Energy gain= Energy Lost + heat lost to the surroundings The beaker in which our ice was located in was not insulated. The beaker was open to the surroundings leading to heat loss to the surroundings. Had we correctly insulated the beaker, not all but at least most of the heat would not have been wasted which is why our values for the latent heat fusion were to low. Subsequently, our value for energy loss was too low as energy had been lost from the system due to heat loss to the surroundings. Our value for energy lost had an around 30% error we believe this was greatly because of heat loss to the surroundings. As mentioned above the ice was not actually 0 degrees Celsius in fact the moment the ice was removed from the freezer and carried across the classroom its temperature had already risen significantly in addition with melted water changing its temperature. This means that the ice’s temperature at the beginning of the experiment was greater than recorded which means that the enthalpy change of the ice was greater than it should’ve been. Subsequently, the total energy gain would have been quite a bit greater than assumed leading to a too heavy subtraction from the energy loss. Once more explaining our final result being too small. In fact, we don’t even know whether the ice is actually 0 degrees as there is no guarantee that this ice is really pure ice and that therefore it’s freezing temperature would be 0 degrees Celsius and if it was impure it’s melting point would be below 0.