Classifying properties and changes.

Classifying Properties

• Ask yourself the following questions.• How do I know this property exists?– Did I touch it?– Did I look at it?– Did I smell it?– Did I hear it?– Did I taste it?

• If you answered yes to any question it is physical.

If you answered no, it may still be physical.

• Did I measure it?– With a ruler?– With a balance or scale?– With a clock or timer?– With a thermometer?– With something that measures volume?

• If yes it is probably physical

Last check…..

• Did I only know this property exists because I tested it with something else?

– If you did not use your senses or a measuring device and you needed to test it with something else.

• It is a chemical property

Classifying Changes

• Ask yourself the following questions.• What were its physical properties before the

change?– Can I still tell that most of them exist?– Can I identify each type of matter that was

combined?– Can it be undone easily?

• If you answered yes to these questions it is physical.

Classifying Changes

• Ask yourself the following questions.• Where the changes expected?– Was the mass greater or lighter then when it started?– Did it get hot or cold without adding heat or taking

heat away? If I changed heat was there more used or given off than I put in?

– Did the color change seem illogical?• If you answered yes to these questions it is

chemical.