how does freezing point and melting point help us identify a substance?>
2006-11-01 10:46:58 · 12 answers · asked by Anonymous in Science & Mathematics ➔ Physics
each pure substance has a unique melting point which differs from melting point of other substances so you can identify a substance by its melting point
2006-11-01 10:50:21 · answer #1 · answered by Ormoz 3 · 2⤊ 0⤋
Freezing point and melting point should be the same. Determining the melting point of a substance can help identify just what it is. Many things may have the same melting point, but it does serve to eliminate other compounds. If the melting point is, say, 35 degrees Centigrade, we know water is not involved. I took qualitative analysis in college and had to do a great deal of work on melting points, boiling points, etc. It was kind of fun.
2006-11-01 18:52:59 · answer #2 · answered by Dino4747 5 · 0⤊ 0⤋
Pure substances have unique physical properties like the melting point. It is not an absolute identifier in some cases because other substances pure and not pure could have the same melting point.
2006-11-01 18:55:47 · answer #3 · answered by Dr. J. 6 · 0⤊ 0⤋
If an object freezes (passes its freezing piont), it becomes a solid. When an object melts (passes its melting point), it turns into a liquid.
If the object is at room temperature (25 C or 298K) and shows its state, we can round it down by that state.
General science law : If an objects melting point is above room temperature, it is a solid. If it's below room temp. it is a liquid
2006-11-01 18:57:47 · answer #4 · answered by Bilko! 2 · 0⤊ 1⤋
Every compound or liquid in its pure form has a specific freezing or melting point. For instance when I extracted caffeine from tea in organic chemistry we used the melting point of the extracted compound to verify it was caffeine.
2006-11-01 18:52:17 · answer #5 · answered by Perry L 5 · 0⤊ 0⤋
Because substances have different melting and boiling points! For example, water should boil at 100 C (at sea level), if it boils at a higher or lower temperature, you know that the water is not pure.
2006-11-01 18:49:38 · answer #6 · answered by Mary 3 · 0⤊ 1⤋
I think each element has it's own unique melting and freezing point, but I'm not 100% sure...
2006-11-01 18:50:46 · answer #7 · answered by i like to swim 1 · 1⤊ 0⤋
It tells us if it is a metal if it is a liquid or a gas because of the way (if it) melts or freezes.
2006-11-01 18:51:40 · answer #8 · answered by celine m 1 · 0⤊ 1⤋
Well, water freezes at 32 F, so I would say yes.
2006-11-01 18:49:48 · answer #9 · answered by Anonymous · 0⤊ 1⤋
it all has to do with the number of electrons....and that definetly helps us identify a substance.....every substance or element has a certain # of electrons
2006-11-01 18:50:13 · answer #10 · answered by sparkle 2 · 0⤊ 1⤋