Chemistry ! 5 questions

1) which of the following is a exothermic reaction?
- dissolving ammonium nitrate in water to cool the water.
-condensation
-dissolving sugar in water
-melting ice

2) which of the following parameters is measured directly in a calorimeter lab?
- temperature
- pressure
- kinetic energy
- heat of fusion

3) what type of substance would be best for use in a heating system?
- a liquid with a high specific heat
- a gas with a low specific heat
- a solid with a high specific heat
- a liquid with a low specific heat

4) which of the following is a an example of an endothermic reaction?
-melting ice cubes
-hot pack or hand warmer
-cooking food

5) which of the following is likely to be true about an equation in which there evaporation?
- the enthalpy is zero
- the enthalpy is positive
- the enthalpy is negative?