Ateacher does a demonstration for her science class. she has two samples of white powder that look the same. she also has two beakers that are each filled with the same amount of water. she adds powder x to the first beaker and adds powder y to the second beaker. the first beaker becomes cold to the touch. the second beaker does not experience a significant change in temperature.

which of the following does this provide evidence for? '
a.
both powder x and powder y undergo a chemical reaction when placed in water.
b.
neither powder x nor powder y undergoes a chemical reaction when placed in water.
c.
powder y and powder x are samples of the same substance.
d.
powder y and powder x are different substances.