2007-09-23 11:00:48 · 5 answers · asked by xburned_icex 1 in Science & Mathematics ➔ Chemistry
Change of state is a physical change.
The change from liquid to solid gives off heat.
That is why the atmosphere warms when it starts to snow.
The change from gas to liquid also releases heat.
There is some question as to whether when a compound goes into solution and gives off heat is totally physical.
When NaOH is added to water, the water gets hot.
2007-09-23 11:06:58 · answer #1 · answered by science teacher 7 · 1⤊ 1⤋
Pour sulfuric acid into water. Watch the temperature rise. Pour water onto sodium hydroxide pellets. Watch the temperature rise.
2007-09-23 11:05:11 · answer #2 · answered by steve_geo1 7 · 0⤊ 0⤋
Filing a piece of metal, chopping or sawing a log of wood.
2007-09-23 11:09:24 · answer #3 · answered by Norrie 7 · 0⤊ 0⤋
melting ice into water. the water is warmer than the ice, thus heat is produced.
2007-09-23 11:08:04 · answer #4 · answered by Uliju 4 · 0⤊ 0⤋
match stick creats fire, the wood burns = physical change
2007-09-23 11:05:38 · answer #5 · answered by Komodork 3 · 0⤊ 3⤋