Crushed ice, at -25 digrees was heated using a bunsen burner. The temperature was recorded over a period of 16 minutes. Between 5 and 9 minutes there is no increase in temperature. What change of state is taking place?
The ice is melting; the phase is changing from solid to liquid.
Based on the information provided, a change of state is occurring between 5 and 9 minutes, where there is no increase in temperature. In this case, the change of state is likely the phase transition from solid to liquid. This indicates that the crushed ice is melting and transitioning from an ice solid state to a liquid water state.
Between 5 and 9 minutes, when there is no increase in temperature, it suggests that a change of state is occurring. In this case, the change from crushed ice at -25 degrees Celsius to a different state could be the process of melting.
To confirm this, we can analyze the given information. When the bunsen burner is applied to the crushed ice, it provides heat energy. Normally, the temperature of a substance gradually increases when heat is added. However, if the temperature remains constant during this time, it indicates that the heat energy is being used to break the bonds between the particles rather than increasing the particle's kinetic energy (which would cause a rise in temperature). This indicates a change of state.
In the case of ice, the change from solid ice to liquid water occurs at 0 degrees Celsius. This transition requires energy to break the intermolecular forces holding the ice particles together. Therefore, the lack of temperature increase between 5 and 9 minutes suggests that the crushed ice is melting and transitioning from a solid state to a liquid state.
In summary, the change of state taking place between 5 and 9 minutes is the melting of crushed ice, where it transitions from a solid to a liquid state.