Determining the Sign of AHIndicate the sign of the

Chapter , Problem 1PE

(choose chapter or problem)

Determining the Sign of  \(\Delta H\)

Indicate the sign of the enthalpy change, \(\Delta H\), in the following processes carried out under atmospheric pressure and indicate whether each process is endothermic or exothermic:

(a) An ice cube melts; (b) 1 g of butane \(\left(C_{4} H_{10}\right)\) is combusted in sufficient oxygen to give complete combustion to \(C O_{2} \text { and } H_{2} O\).

A chemical reaction that gives off heat to its surroundings is said

to be ____________ and has a ____________ value of  \(\Delta H\)

(a) endothermic, positive (c) exothermic, positive

(b) endothermic, negative (d) exothermic, negative

Equation Transcription:

Text Transcription:

\Delta H

\Delta H

(C4H10)

CO2 and H2O

\Delta H

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