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ReneMelting a sugar cube is a physical change because the sugar molecules do not transform into a different substance when heated, but only change from a solid to a liquid state. If the melted sugar were to further undergo a chemical change, such as caramelization or burning, then it would be considered a chemical change.
Because scorching something cannot be reversed, and a chemical change is a change that cannot be reversed. If you were just putting sugar into water, you could get the sugar back to its original state by evaporating the water, and the sugar would stay at the bottom of the glass. That would be a physical change because you can reverse the change.
If you scorch sugar, you cannot make it un-scorched. It cannot be reversed. It is a chemical change.
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Melting sugar cube is what change because the substance still is sugar?
Melting a sugar cube is a physical change because the substance remains sugar, just in a different form (solid to liquid). The chemical composition of sugar does not change during the melting process.
Melting a sugar cube is a change?
Melting a sugar cube is a physical change because it involves a change in state from solid to liquid without altering the chemical composition of the sugar molecules.
When a sugar cube dissolves is it a chemical change?
No, the dissolving of a sugar cube is a physical change, not a chemical change. The sugar molecules are still the same chemically; they are just dispersed in water instead of being in a solid form.
Is an ice cube physical change?
Yes, an ice cube melting into water is a physical change. In this process, the substance changes from a solid state to a liquid state without altering its chemical composition.
How many ways can a sugar cube change?
That would depend on how you define "change" and "sugar cube". If moving a sugar cube changes it, since you could move any sugar cube to an uncountable number of other locations, such a sugar cube could change in an infinite number of ways. If you define "sugar cube" as a six sided solid of glucose, you could substitute any one or more of several billion atoms for its isotope, and change it into a different sugar cube. If you allow chemical reactions, as in "how many ways can the contents of a sugar cube be used to make another substance?", then again, there are an infinite number if potential transformations. If you were to hurl a particular sugar cube into the ocean or the sun, in a thousand years, atoms from that cube would be found in several billion organisms.
