Jown
Which statement best describes Reagan's main message
for his audience in this excerpt?
in West
y city in
lawns of
e been
The Berlin Wall is a reminder of the past and of the
war.
O The United States is more powerful than the Soviet
Union.
O Democracy leads to greater prosperity than
communism does.
O Berlin is a thriving city that can boast of many
accomplishments
nd POP
uin, you
nce again

c

explanation:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.