Which processes occur at the triple point?

The ability for liquids to mix without separating into two phases is called _________.

Consider adding enough heat to a solid sample of a substance below its melting point to change the sample to the gas above its boiling point. Which of the following would involve no change in temperature of the sample as the described transition occurs?

Calculate the amount of heat (in J) required to heat 2.00 grams of ice from −12.0℃ to 88.0℃.
The heat of fusion of water is 6.02 kJ/mol, the specific heat capacity of ice is 2.09 J/g ▪℃ and the specific heat capacity of water is 4.184 J/g ▪℃.

Consider the phase diagram below: What changes would the sample undergo as the sample moves from the temperature and pressure at point 'a' to the temperature and pressure at point 'b'?