Thermal energy that is not converted into work is called ) The species which by

Question

Thermal energy that is not converted into work is called ) The species which by definition has ZERO standard molar enthalpy of formation at 298K is a) Br0) b) HCKg) c) H20(g) d) CH48 13) A reaction that is spontaneous as written a) is very fast b) will proceed without outside intervention c) is also spontaneous in the reverse direction d) is very slow 14) A system that does exchange matter but not energy with its surroundings is called 15) When an ideal gas is isothermally compressed (a) thermal energy flows from the gas to the surroundings (b) the temperature of the gas decreases (e) no thermal energy enters or leaves the gas (d) the temperature of the gas increases (e) thermal energy flows from the surroundings to the gas.

Explanation / Answer

Q1)

Typically it s called "waste heat" since it is a low quality heat. It is too low in temperature to be used in any thermomechanical application.

Q2

at STP conditions, the species must be = most stable allotrope, pure subtance

a) Br2(l) --> correct, Br will be found as Br2(l) rather than br- ion

b) this is not pure, not 0

c) H2O = not pure, no t0

d) CH4 = not pure, not 0

Q13

a) false, equilbrium and kinetic will not be interchangeable

b) true, will proceed forward without any externalsource

c) false, only one direction is possible

d) false, cant relate to rate

Q14

this is impossilbe, since all matter has energy, therefore, not likely to exist

the nearest will be exchange of heat and no mass --> closed system

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