A thermodynamic cycle which works to cause heat to flow from a cold resorption to a hotter reservoir is called? a. a heat reservoir
b. a heat pump
c. a heat engine
d. a perpetual motion machine

a and c

Explanation:

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in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

it would be d. henry moseley

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