.
.
Chemistry
means that substances disappear and new substances
are formed
*
Left:
A match burns while carbon is formed. Light and
heat are released.
*
Middle:
Sea
water is transformed into chlorine gas by electricity. Electric energy
is consumed.
*
Right:
Steel
rusts leaving a red brittle substance (Heat is released during rusting).
Chemical
reaction is
a transformation of substances in which they disappear while new substances
are formed.
There
is no change of a substance without a change
of energy.