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Physical and chemical changes

Asked by horndog 5 months ago, 4 answers.

what are the properties of physical and chemical changes individually

I am What I am Answered by ibelievee on Jun 15, 2009, 05:06PM
5 answers

Physical changes are those changes that do not result in the production of a new substance. If you melt a block of ice, you still have H2O at the end of the change. If you break a bottle, you still have glass. Painting a piece of wood will not make it stop being wood. Some common examples of physical changes are; melting, freezing, condensing, breaking, crushing, cutting, and bending. Special types of physical changes where any object changes state, such as when water freezes or evaporates, are sometimes called change of state operations.

Chemical changes, or chemical reactions, are changes that result in the production of another substance. When you burn a log in a fireplace, you are carrying out a chemical reaction that releases carbon. When you light your Bunsen burner in lab, you are carrying out a chemical reaction that produces water and carbon dioxide. Common examples of chemical changes that you may be somewhat familiar with are; digestion, respiration, photosynthesis, burning, and decomposition.

Answered by angryfetis on Jun 16, 2009, 05:18PM
23 answers

Exactly. Physical changes are such as Hardness, Maliability, Texture, Smell, Looks.
Chemical changes produce a new substance

... Answered by goat11 on Jun 27, 2009, 02:22AM
186 answers

simply, though don't rely on this definition, the other two are very accurate...
but simply; if something undergoes a physical change it can be restored

Answered by rgfdhxcvhncvbm on Jul 28, 2009, 12:24AM

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