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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!
What else can I help you with?
What is a chemical change that is useful to you?
making cake
Are chemical reactions useful?
yes some chemical reactions are harmful to us. as digestion of food, photosynthesis, decomposition of organic waste are some examples of the useful chemical reactions.
What is the energy in a chemical or physical change that is available to do useful work?
Free energy
How is a chemical change useful to people?
To make people's lives easier and more comfortable
How chemical change is useful to people?
Chemical change is useful because when it occurs, some desirable outcomes such as combustion occurs. Some reactions give off heat energy. Heat packs work by allowing certain chemicals to mix and give off heat.
What are bad chemical changes?
Depends on what you mean by "bad". In your apple or on your bicycle, oxidation is a bad chemical change, but maybe you like brown mushy apples or are creating some art project that you happen to need a rusted bicycle for. The same is true for every chemical change. In some situations its good, useful, or generally what you want. And other times, not so much.
Is a cooked hot dog physical or chemical change?
CHEMICAL:)
Is cabbage juice and vinegar a chemical or chemical change?
The color change, though physical by itself, is caused by a chemical change of some colored substances in cabbage.
Is axe sharpening a chemical change?
yes it is a chemical change as some part of the axe gets removed
Does a chemical change make a new substance?
some chemical reaction can.
What are some characteristics of chemical change?
A characteristic of a chemical change is a change in odor. Another characteristic is a change in the temperature. Another characteristic is the creation of a precipitate. Those are just some characteristics.
Is a Toasting a piece of bread a chemical change or physical change?
It is a chemical change because some compounds from bread are thermally decomposed.
