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A physical change is reversible or temporary and a chemical change is permanent.Chemical change is a change that imply modifications in the structures of molecules; new compounds appear.Ex.: burning of coal with releasing of carbon dioxide and water.Physical changes don't imply the structure modification of the molecules but only the state of matter, form, dimensions; the chemical compound remain unchanged.Ex.: grinding of coal to be used in a thermal power unit.
Please don't just copy this; actually learn what I'm telling you. The ability to rust is a chemical change because a new substance was created. Rust was created during the chemical change. If you need more info: A PHYSICAL change is when no new substance is created. Tearing paper is a physical change, because all you have is paper, which you had before. Phase changes are also physical, because you have no actual new substance. When water freezes, it's still water, even if we call it ice because it got harder to the touch. Chemical: Rust, burning (ash is created), bubbling (gas is created), baking (same as burning, just different stuff results), eating/digesting (trust me on that one) Physical: (you're left with the same old stuff, just looking different): ripping, cutting, shredding, melting/freezing/boiling.
Burning old wooden boards to recover the nails and screws embedded in them.
Physical Change ➢ In physical change, only form or state, size, or shape changes. Example: If a piece of paper is cut up into small pieces it is still a paper. ( A physical change in the shape and size.) ➢ Does not result in a new material; thus, the new form may be changed back into the old form or state. Example: Water turns to ice and ice melting to water. (Ice and water are both H2O. The identity of the matter is not changed, just the state is being changed.) ➢ Physical change affects the appearance.
Physical ... it's only a state change. Cool it and it reverts to its old condition.
CHEMICAL
It is definitely a chemical change
because you are a old me is a kid
when you bleach your hair it is a chemical change,because you are adding the chemical from the bleach to your hair and "you can't change it back to the old". chemical change: you can't change it back to the old and it makes a new subtance. physical change:it does not make a new subtance and it is still the same object.
You can try searching the archives of the Marco Eagle newspaper online or contact the newspaper directly. Some libraries or archives may also have physical copies of old newspapers that you can search through.
Nails
when you bleach your hair it is a chemical change,because you are adding the chemical from the bleach to your hair and "you can't change it back to the old". chemical change: you can't change it back to the old and it makes a new subtance. physical change:it does not make a new subtance and it is still the same object.
A physical change is reversible or temporary and a chemical change is permanent.Chemical change is a change that imply modifications in the structures of molecules; new compounds appear.Ex.: burning of coal with releasing of carbon dioxide and water.Physical changes don't imply the structure modification of the molecules but only the state of matter, form, dimensions; the chemical compound remain unchanged.Ex.: grinding of coal to be used in a thermal power unit.
It is not a chemical change because after cutting the chemical composition remain unchanged.
Skin: it starts to get wrinkles when they get close to being old.
yes