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Chemical Change occurs when one or more recognized substances cease to be recognizable and one or more "new" substances is now newly recognized. "Old and new" being distinguishable characteristic properties. Chemical change can be reversed; however, the reverse must also be chemical.
Chemical changes are those that can be undone with "difficulty", whereas a physical change can be undone comparatively easy. For instance, if you tear a piece of paper in two, you can tape it back together. If, however, you burn the piece of paper, there is no way to get the paper back from the ash. except through photosynthesis -- it has undergone a chemical change, one which cannot be undone very easily.
More examples:
Physical:
A balloon contracts when it is cooled
A pond freezes over
Gold is shaped into jewelry
Salt dissolves in water
A paper shredder rips paper
Chemical:
Food digests
Silver tarnishes
Vinegar reacts with baking soda to produce CO2
Wood burns
An apple browns
A copper church steeple turns green
A candle burns
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∙ 13y ago
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Which in the following events is not a common sign that a chemical change taken place?
For example melting, boiling, evaporation, transformation in powder are not signs of a chemical reaction.
Is burning a fire a physical or chemical change?
Burning is a chemical change.
What type of change when a substance changes into a new substance?
chemical
Is a rotting banana a chemical or physical change?
It's a chemical change
Is cellular respiration an example of a physical change or an chemical change?
its a chemical change
Which in the following events is not a common sign that a chemical change taken place?
For example melting, boiling, evaporation, transformation in powder are not signs of a chemical reaction.
Is burning a fire a physical or chemical change?
Burning is a chemical change.
What type of change when a substance changes into a new substance?
chemical
Is a rotting banana a chemical or physical change?
It's a chemical change
Is peeling an apple a physical or chemical change?
it is a chemical change
Is cellular respiration an example of a physical change or an chemical change?
its a chemical change
is tarnishing a chemical or a physical change?
It is a chemical change.
Is oxidizing a physical or chemical change?
chemical change:)
Exploding of nitroglycerin is it a chemical or physical change?
it is a chemical change
Is extraction a physical or chemical change?
No. A physical change is a change that does not change the chemical composition of a substance, while a chemical change does change the chemical composition of a substance.
What result in a new substance formed?
It is a chemical change.
Is crushing charcoal into powder a physical or chemical change?
Chemical I think
