Which of the following transformations are endothermic?

1)The burning of a piece of wood in a fireplace.

2)The water vapor condensed into clouds.

3)As a result of a reaction, the products have more energy than the reactants.

4)The dry ice sublimated into carbon dioxide.

5)N2(g) + 3 H2(g) to 2 NH3(g) + 92 kJ

6)A change of state required heat.