HCl is a corrosive colourless gas that dissolves readily in water, Aqueous HCL reacts with NaOH to form water and NaCl. In a simple
calorimeter, a 100.00 mL sample of 0.355 mol/L HCl(aq) is mixed
with 50.00 mL of excess NaOH(aq). During the reaction, there is a
rise in temperature by 4,200 °C. Calculate the molar enthalpy change
for the above reaction. SHOW ALL YOUR WORK,

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.