HW #19 for 5/2

Answer on a piece of separate piece of paper:

Identify each of the following changes as chemical or physical.  If it is a physical change give the name of the change of state.  Then identify if it is an exothermic or endothermic reaction. :

1.) Solid iodine turns directly into gaseous iodine when left on your table.
2.) Solid sodium hydroxide mixes with liquid water and the mixture turns very hot.
3.) A cold pack is activated by a packet of liquid water is burst open and mixed with solid ammonium nitrate and immediately turns cold.
4.) Outside a bottle of water is left out and turns to gaseous water.
5.) Then overnight, the weather turns cold and the gaseous water forms frost on the plants outside.
6.) A cake is mixed and cooked in the oven for Mother's Day.
7.) Special sun paper is left outside in the sun and it turns to a different color.
8.) Steam collects underneath the lid of a pot and turns to water drops.