A 250 gram chunk of silver is dropped into 250. mL of water at 23.0 °C. The final temperature of the water was measured as 30.1 °C. Calculate the initial temperature of the
piece of silver. Assume that all heat transfer occurs between the silver and the water (the Cp
of silver is .240 J/gºC and water is 4.18 J/gºC)

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.