done entering text button 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: done entering text button

done entering text button 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: done entering text button

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…

introduce law of conservation of matter

"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