Answer:
Placing a powder into a beaker that contains liquid, resulting the beaker to get hotter.
Explanation:
Physical property is something that you can observe that does not affect the mixture/solution/substance, and that includes temperature
1/2 - 3/7 = 7/14 - 6/14 = 1/14
I believe this is a double replacement. As you can see none of the chemical symbols are missing, there just "replaced".
