Hard water contains calcium and magnesium, which undergo oxidation and clog water pipes. which statement best describes this change as a chemical change?

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

The radius of an atom is closest in size to a

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.