Did i do these endothermic and exothermic questions right

1) when solid KBr dissolves in water the solution gets colder = endothermic
2)natural gas is burned in a forced-air furnace = exothermic
3)when concentrated acid is added to water the solution gets very hot = exothermic
4) water boiled in a teakettle = endothermic

All done crorectly

you have to focus on the system. In the last case, water in the kettle is the system. You are adding heat to it, so it is clearly endo

I think adding heat to water in a kettle would be considered endothermic. The cooling of the water would then be considered exothermic.


So I think you are right on all counts.