Some chemical changes are baking a cake and a rusting bicycle.
Another chemical changes could be:
some chemical changes can be reversed but they are hard to reverse usually
Freezing a popsicle
Chemical changes can be both good and bad. Some chemical changes are necessary for life to exist, such as in the process of digestion. However, some chemical changes can be harmful, such as those that occur in pollution or the degradation of materials.
because it mixes substances that makes a chemical change
Some chemical changes are reversible, others are not.
hot cold
Some chemical changes when you are cooking are:burning the foodOVERcooking itUNDERcooking itsorry for only three examples. those are the ones that i can only think of so far.
I would argue that in theory all chemical changes are reversible. However it is certainly true that considerations of enthalpy and entropy mean that some are totally impractical to reverse.
No, changes in state of matter (such as melting, freezing, boiling) are physical changes, not chemical changes. Chemical changes involve the formation of new substances with different chemical properties.
There are no physical changes. there are only chemical changes.
Some useful chemical changes are when a solid changes into a liquid. Such as when ice melts it is turned into water.Sorry but I am afraid that is wrong.Freezing, melting and evaporation including sublimation, i.e., Changes of State, are all physical, not chemical, changes.As for "useful" chemical changes.... Almost all biological processes, the conversion of fuel to its oxides etc with consequent release of heat &/or light, the list goes on!
something