hair irons? Physical or chemical change?
821503
as long as no new substance is formed and the change is not permanent/irreversible,it is physical change
806969
Hmmm change in gravity?\n\nYou need to send a free sample of hair dye to NASA so they can sent it out in space and test it for you.
774081
That will do it. Also, hair contains di-sulphide bridges (S-S bonds). Breaking these will make the hair straighter. The compounds that break disulphide linkages are foul smelling (mercaptains, etc) so aren't as popular .
47160
You don't. That's a myth. You just get the same amount of hair with the same thickness you had before. It just looks different because it's cut differently.
871925
Any material that changes color with response to a temperature change is called ‘thermochromic.’  There are three common ways of doing this: with a gel, which will work in a water-based environment (which is not typically stable for use like this application), with an organometalic compound (usually very toxic; Cobalt (II) chloride is a common one - blue to pink), and with a thermally-responsive pH indicator.  When the doll’s hair is heated, one compound will change its pH.  That change in pH will interact with a pH sensitive dye, and change the hair’s color.\n\nUnfortunately, the chemicals used in Barbie’s hair would fill a chemist’s Christmas list – \nFrom the patent, here is the list of chemicals:\n…(A) from about 1% to about 20% by weight of one or more electron-donating, chromatic organic compounds selected from the group consisting of diaryl phthalides, polyaryl carbinols, leuco auramines, lactum leuco compounds, indolines, spiropyrans and fluoranes having a molecular weight of from about 350 to about 1000; (B) from about 2% to about 30% by weight of one or more compounds having a phenolic hydroxyl group and a molecular weight of from about 200 to about 800; (C) from about 10% to about 90% by weight of one or more compounds selected from the group consisting of lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, docosyl alcohol, oleyl alcohol and mixtures thereof; and (D) the balance to make 100% being one or more compounds selected from the group consisting of octyl caprylate, decyl caprylate, octyl caprate, decyl caprate, cetyl caprate, stearyl caprate, butyl laurate, octyl laurate, lauryl laurate, stearyl laurate, butyl myristate, decyl myristate, myristyl myristate, cetyl myristate, octyl palmitate, butyl stearate, decyl stearate, lauryl stearate, stearyl stearate, 12-hydroxy stearic acid triglyceride and mixtures thereof…\n\nThey purposely try to be as general as possible – probably only a few combinations of these chemicals, at the right concentrations will give the desired color change.\n\nIf you want to search for something to experiment with, do a google for thermochromic inks.  \n\nSorry I couldn’t be of more help.  Good luck!
551973
TO CAUSE THE CHANGE CHEMICAL REACTION
323999
Physical changes only change the appearance of the substance eg - water turns to ice or turns to water vapor is a physical change. The atoms are not rearranged. This kind of reaction is easy to reverse.\nChemical changes actually changes the chemical substance, and its characteristics and require much energy to occur. eg - hydrogen and oxygen combine to form water (H2O). these reactions are very hard to reverse. The atoms are rearranged. \nMarina.
898536
no I honestly do not think so, the hair loss is from something else. Of course in my opinion I haev been on those for a very long time of course now on the harder stuff and never had hair loss
1090476
Iron (like steel and certain alloys) contains atomic magnets or dipoles which can line up their 'magnetic axes' in a preferred direction.  In the magnetized state, all the magnetic axes will point in one specific direction, by which the iron filling will show polarity and hence be a magnet itself.\nWhen you heat the iron fillings, the high temperature makes the atoms to vibrate with increasing energy and this disturbs the dipoles and so the resultant magnetic axes point in their 'preferred' random directions, which keep changing due to the extra energy. If the iron fillings were magnetized before heating, all the magnetism would be lost. Magnetizing them after heating will not align the vigorously vibrating atomic magnets and rapidly changing magnetic axes.
263675
I believe it is iron.  Not an expert though.
1084812
Iron is usually attracted to a magnet. If a bar of iron is magnetized, One end of the bar will attract one pole of the magnet, and repel the other pole of the magnet. \nCopper, nickel, and zinc are not magnetic. They neither attract or repel a magnet, and they cannot be magnetized.
115495
Curling irons-hair dryers-flat irons-perms-hair color-teasin-daily washing-ALL of these can dry out your hair.
591117
The physical quantitative changes in response of a chemical change is Smetry.
537646
The thing is that iron III hydroxide isn't soluble in water.  It just sits there and doesn't make many hydroxide ions, which are necessary for a strongly basic solution.  Barium hydroxide, however, is soluble and breaks up into barium ions and hydroxide ions, giving a strongly basic solution.
488684
a physical change is changing the appearance of something... like if you melt ice, techincally it's still ice, just in a different form... you can ALWAYS change something back when you change it physcially\n\na chemical change is just the opposite. its cahnging the chemical balances of something and you can't change it back... like if you burn wood... the wood turns to ask and you can never get that ash back into wood.
466433
They have hair straighteners in stores, but some are better than others. IF you are of African decent, I believe Just for men has a special line of products.\n\ngo to the hair care aisle in Walmart or wherever you shop, and look. There are chemical straighteners and the iron type. Take your pick.\n\nHopefully you are not wanting straight hair just because someone said something rude about it. If someone said something rude about it, pizzz on them!
364488
Wikipedia will tell you, if you check this link:\nhttp://en.wikipedia.org/wiki/Ironing