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CHEMICAL CHANGES

TRANSCRIPTION
 
Chemical and physical changes say hello
to mark and Molly each are enjoying a
glass of water deciding to save some for
later Molly puts her glass in the
refrigerator and mark decides to put his
in the freezer a short time later they
go to get their drinks Molly enjoys her
cold liquid water but something has
happened to Mark's water his has
physically changed matter can undergo a
chemical change or a physical change a
closer look at ice will show us that
frozen water is h2o molecules made of
hydrogen and oxygen atoms when the ice
cube melts the molecules stay h2o they
just change from a solid to a liquid
even when water evaporates the molecules
might be moving a little faster but
there's still water molecules another
example of a physical change would be
bending iron metal iron can be made into
i-beams or pressed into shapes whether
the iron is in a beam or in a shape it
still as fe atoms just in a different
shape a chemical change occurs when an
entire new material is created or the
atoms become rearranged iron rusting is
a chemical change because the iron turns
into a new material the process of
rusting can be seen in a chemical
formula iron plus water plus oxygen
yields iron 3 oxide or rust in this
chemical equation we start with iron but
end up with something brand new another
chemical change happens when you eat
sugar sugar enters your body as c 6h
1206 when you breathe in oxygen gas a
chemical change begins the sugar is
broken down and turned into carbon
dioxide and water the sugar molecule has
chemically changed another chemical
change happens when you drive your car
gasoline enters your car as octane
octane is c 8 h 18 in your engine oxygen
is introduced and the octane changes
into carbon dioxide and water this is a
chemical change because octane is no
longer a molecule something new has been
created you can tell the difference
between chemical and physical changes
because chemical changes can't easily be
undone but lucky for mark a physical
change can be undone and his glass of
water is almost back to a liquid
chemical and physical changes
 
 
After watching the video try to perform the proposed activities! Good luck!

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