Which of the following is kept constant when using a coffee cup calorimeter? temperature density mass pressure

The answer is pressure

Pressure

Explanation:

A coffee-cup calorimeter is essentially a constant-pressure calorimeter which is  used to measure the enthalpy change (ΔH) in a solution. It comprises of a system of 2 nested styrofoam cups containing water which absorbs the heat from the reaction. A thermometer is inserted through the lid of the cup to record the changes in temperature.

Thus, the heat flow measured at constant pressure, q(p) is the enthalpy change (ΔH) of the reaction

The amount of heat absorbed or evolved during a reaction is related to the mass of the substance(m), specific heat capacity (c) and the change in temperature, ΔT

answer; i believe the correct answer is (solid gold);

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.