Question

Indicate which state function is equal to heat, q, for each
process described.
a. The ignition of a sample in a bomb calorimeter, an unyielding,
heavy metal chamber in which samples are burned for
heat content analysis
b. The melting of an ice cube in a cup
c. The cooling down of the inside of a refrigerator
d. A fire in a fireplace

Answer 1

a. The ignition of a sample in a bomb calorimeter, an unyielding, heavy metal chamber in which samples are burned for heat content analysis --> True, clearly burning implies heat

This can be done via Q = dH = dHreaction

b. The melting of an ice cube in a cup --> assume this is open air so

Q = dH = m*C*(Tf-Ti)

c. The cooling down of the inside of a refrigerator

cooling down of inside a refrigerator, assume constan P so

Q = dH

Q = m*C*(Tf-Ti); note that dT will be negative, since it is cooling

d. A fire in a fireplace

A fire place is exothermic, will be burning fuel with oxygen to release heat

Q = dH = moles of fuel * Enthalpy of combustion of fuel