give 2 examples of physical chemistry
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One way to identify a physical change is that such a changes may be reversible, especially phase changes. For example, if you freeze an ice cube, you can melt it into the water again. Ask yourself:
Is the change reversible? (note, not all physical changes are easy to reverse)
Was there a color change (with exceptions), bubble formation, or formation of a precipitate? (These are all signs of a chemical change and not a physical change.)
Is the chemical identity of the end product the same as it was before the change? If the answer is yes, it's a physical change. If the answer is no, it's a chemical change.
Examples of Physical Changes
This is a list of 10 examples of physical changes.
crushing a can
melting an ice cube
boiling water
mixing sand and water
breaking a glass
dissolving sugar and water
shredding paper
chopping wood
mixing red and green marbles
sublimation of dry ice
Is the change reversible? (note, not all physical changes are easy to reverse)
Was there a color change (with exceptions), bubble formation, or formation of a precipitate? (These are all signs of a chemical change and not a physical change.)
Is the chemical identity of the end product the same as it was before the change? If the answer is yes, it's a physical change. If the answer is no, it's a chemical change.
Examples of Physical Changes
This is a list of 10 examples of physical changes.
crushing a can
melting an ice cube
boiling water
mixing sand and water
breaking a glass
dissolving sugar and water
shredding paper
chopping wood
mixing red and green marbles
sublimation of dry ice
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