Which change can easily reverse?
a) chemical change
b) physical change
c) both chemical and physical changes
d) neither chemical nor physical change
Chemical Changes:
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.
Which of the
following change/s take/s place when matter completely changes to become an
entirely different kind of matter?
a) physical change
b) chemical change
c) reversible change
d) both a and b
Which change cannot easily reverse?
a) chemical change
b) physical change
c) both chemical and physical changes
d) neither chemical nor physical change
Which of the following change/s take/s place when we burn wood?
a) physical change
b) chemical change
c) reversible change
d) both a and b
When we burn wood, which of the following substance/s is/are formed?
a) ashes
b) black smoke
c) wood
d) both a and b
