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CHAPTER 2: Energy and Matter
Physical and Chemical Properties
Physical and Chemical Changes
Chemistry – the study of matter
its composition, structure, and properties
its transformations – both chemical and physical
and, the accompanying changes in energy
Characterize pure matter (substances)
1st based on physical and chemical properties
physical properties:
characteristics of a substance that can be
observed or measured without changing the
identity of the substance
examples:
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CHAPTER 2: Energy and Matter
Physical and Chemical Properties
Physical and Chemical Changes
Characterize pure matter (substances)
1st based on physical and chemical properties
chemical properties:
characteristics of a substance that allow it to
undergo changes that transform if into
different substance(s)
examples:
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3. Atoms are bonded in compounds… Bonds have to break, and new bonds SO
CHAPTER 2: Energy and Matter
Physical and Chemical Properties
Physical and Chemical Changes
Characterize pure matter (substances)
2nd based on physical and chemical changes
physical change:
chemical change:
David Bowie
1971
23 yo
Remy….
Ch…ch…ch
RIP
Ch…ch…ch
David Bowie
2002
55 yo
a change in one or more physical properties
with NO change in the identity of the
substance
a change in which one or more substances are
converted into one or more new substances
with new physical and chemical properties
Atoms are bonded in compounds…
Bonds have to break, and new bonds SO
form to get new compounds…

4. introduce law of conservation of matter

5. "Changes" I still don't know what I was waiting for And my time was running wild A million dead-end streets And every time I thought I'd got it made It seemed the taste was not so sweet So I turned myself to face me But I've never caught a glimpse Of how the others must see the faker I'm much too fast to take that test Ch-ch-ch-ch-changes (Turn and face the strange) Ch-ch-changes Don't want to be a richer man Ch-ch-ch-ch-changes (Turn and face the strange) Ch-ch-changes Just gonna have to be a different man Time may change me But I can't trace time
I watch the ripples change their size But never leave the stream Of warm impermanence and So the days float through my eyes But still the days seem the same And these children that you spit on As they try to change their worlds Are immune to your consultations They're quite aware of what they're going through Ch-ch-ch-ch-changes (Turn and face the strange) Ch-ch-changes Don't tell them to grow up and out of it Ch-ch-ch-ch-changes (Turn and face the strange) Ch-ch-changes Where's your shame You've left us up to our necks in it Time may change me But you can't trace time