1. Physical vs.
Chemical
Changes
Notes

2. TEKS 6.5D identify the formation of a new
substance by using the evidence of a
possible chemical change such as
production of a gas, change in temperature,
production of a precipitate, or color change.
TEKS 8.5E investigate how evidence of
chemical reactions indicate that new
substances with different properties are
formed.

3. Matter undergoes
changes all of the
time.

4. There are two
types of changes:
chemicalchemical
physicalphysical &&

5. Physical changes:

6. Physical changes
occur when the
appearance of a
substance
changes…

7. …but
chemicallychemically
the
substance
is the
same.

8. The individualThe individual
molecules domolecules do
notnot changechange..

9. Examples ofExamples of
physical changesphysical changes
are, melting,are, melting,
freezing,freezing,

10. or changingor changing sizesize oror
shapeshape..

11. A physicalA physical
change alsochange also
occursoccurs
whenwhen
substancessubstances
are…are…

12. mixedmixed and somethingand something
dissolvesdissolves…like making…like making
salt water or Kool-salt water or Kool-
aid.aid.

13. The water, saltThe water, salt
and sugar stilland sugar still
keep theirkeep their
originaloriginal
propertiesproperties andand
the substancesthe substances
can be separatedcan be separated
again.again.

14. ChemicalChemical
ChangesChanges

15. AA chemicalchemical
changechange occursoccurs
when the atomswhen the atoms
making up mattermaking up matter
rearrangerearrange....

16. to form a newto form a new
substance withsubstance with
new propertiesnew properties..

17. This usuallyThis usually
occurs during aoccurs during a
chemicalchemical
reactionreaction..

18. Evidence ofEvidence of
a chemicala chemical
change:change:

19. ProductionProduction
of a gas.of a gas.

20. bubblesbubbles
fizzingfizzing
foamingfoaming
smokesmoke
odorodor

21. color changecolor change
*not all color*not all color
changes arechanges are
chemical!chemical!

22. AA differentdifferent
color appearscolor appears

23. *not all color*not all color
changes arechanges are
chemical!chemical!

24. FormationFormation
of aof a
precipitateprecipitate

25. cloudinesscloudiness
foggyfoggy
solidsolid atat
bottom ofbottom of
containercontainer

26. Change inChange in
heatheat or lightor light
energyenergy

27. SparksSparks
explosionexplosion
glowingglowing

28. temperaturetemperature
increases orincreases or
decreasesdecreases

29. TheseThese
are onlyare only
cluesclues……

30. ……a chemical changea chemical change
has not actuallyhas not actually
taken place unlesstaken place unless
matter has changedmatter has changed
into ainto a newnew
substancesubstance..

31. Some commonSome common
examples ofexamples of
chemicalchemical
changeschanges
include…include…

32. RustingRusting……

33. Tarnishing…Tarnishing…

34. Burning…Burning…

35. Cooking…Cooking…

36. Digesting…Digesting…

37. If you have theIf you have the
chemicalchemical equationequation,,
you can tell if ayou can tell if a
chemical changechemical change
has taken placehas taken place
by…by…

38. Looking to seeLooking to see
if the productsif the products
in the equationin the equation
are….are….

39. differentdifferent fromfrom
thethe reactantsreactants..