Describe what darwin observed during his voyage on the hms beagle

What are the percent by mass of copper in penny lab

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m