Soaking is not a chemical change, unless contact with water results in a chemical reaction - such as adding sodium to water.
Physically or chemically.
Ash and smoke.
The dependent variable , which is the one being measured.
Dalton
starches
it is changed to a clay form
The chemical composition was changed during frying.
they disolve :)
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Chemically changed and can be physically separated into different species.
it may be a catalyst, a spectator ion a solvent.
These substances are called catalysts.