physical
For the most part it is a chemical change because the soap bonds with the grease chemically. But also the action of rubbing your hands can cause some of the grease to come off, just like when you wipe your hands off on a paper towel.
The formation of a precipitate is a chemical change.
No, it is physical.
Almost certainly chemical. Color ... that is, absorption or emission of electromagnetic radiation in the visible band ... is usually due to the electronic structure of the compounds. Changing the electronic structure usually means that a bond has broken or formed, which is a chemical change. However, certain types of color changes are physical. For example, when you heat a piece of metal and it begins to glow red, then orange, then yellow as you increase the heat, that's a purely physical change. Certain types of colors... like the swirling colors you see in a soap bubble... are produced by physical phenomena, and the changes there are physical (the color depends on the thickness of the soap film). "Mood Rings" are another example of something that exhibits a physical color change.
Depends whether you have any liquid or change on your hands i.e. soap. If not and her hands have absolutely nothing on them, then probably not.
Soap scum is a substance, not a change; but the formation of scum is a chemical process.
physical
Soap molecules have non-polar and polar ends. When mixed with water, the soap dissolves, therefore having a physical change (but maintaining its chemical properties). The polar ends are in contact with water and consist of a salt, the non-polar ends are a long chain of hydrocarbons that do not mix with water.When soap molecules mix with water they form micelles, that consist of a bunch of molecules that in the center have the non-polar end (that traps dirt and other organic compounds) and in the exterior have the polar end in contact with water.
Pure physical - until you use soap.
For the most part it is a chemical change because the soap bonds with the grease chemically. But also the action of rubbing your hands can cause some of the grease to come off, just like when you wipe your hands off on a paper towel.
The formation of a precipitate is a chemical change.
No, the formation of soap scum is not a chemical change. Soap scum appears as the result of a physical change. Some of the soap and whatever has become incorporated into the soap and water dry. After the water is gone, the things left are from the soap and whatever mixed with the soap when it was "working" at cleaning.
That's a good question, I'm pretty sure that its just a physical change though. I don't think any of the properties of soap are being changed when its dissolved in water. Unless a new compound is being formed between the soap and the water, then its only a physical change. If you don't believe me that a new compound isn't formed, look up dissolving sugar in water. It's pretty much the same idea, and I know for sure that that's counted as only a physical change.
No, it is physical.
Almost certainly chemical. Color ... that is, absorption or emission of electromagnetic radiation in the visible band ... is usually due to the electronic structure of the compounds. Changing the electronic structure usually means that a bond has broken or formed, which is a chemical change. However, certain types of color changes are physical. For example, when you heat a piece of metal and it begins to glow red, then orange, then yellow as you increase the heat, that's a purely physical change. Certain types of colors... like the swirling colors you see in a soap bubble... are produced by physical phenomena, and the changes there are physical (the color depends on the thickness of the soap film). "Mood Rings" are another example of something that exhibits a physical color change.
Depends whether you have any liquid or change on your hands i.e. soap. If not and her hands have absolutely nothing on them, then probably not.
it depends on the brand of soap and some don't use any chemical's