CLOZE 2 The only way to know for sure if a chemical reaction has occurred is to identity that a new
has been formed. There are
we can look
for that help to determine if a chemical reaction has occurred. One sign of a chemical reaction
is the formation of a
observed as bubbling, flezing, or foaming.
Some chemical reactions, like the burning of wood, result in the production of
A change in
either an increase or
decrease, can indicate that a chemical reaction has occurred. The formation of a precipitate is
another sign of a chemical reaction. A
is a solid substance that
separates from a solution. A change in
such as we see
ng of a bike chain, is the final sign that a chemical reaction has occurred. If one or