Explain 5 things that could cause an incorrect mass when using the triple bean balance?

In a system, when potential energy decreases, then entropy also decreases. true false

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?