The muscles of the stomach crush food that has entered the stomach cavity. The effect of this on the food is —
A. O both a chemical and a physical change.
B. neither a chemical nor physical change.
C.
a chemical change, only.
D. a physical change, only.

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?