Classify each process as exothermic or endothermic. (a) ice melts (b) gasoline burns (c) steam c

step 1 In this question we've been given some processes and we've been asked to classify them as either

Classify each process as exothermic or endothermic. (a) ice...

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Key Concepts

Exothermic Process

An exothermic process is one that releases energy, usually in the form of heat, to its surroundings. This release of energy is evident when the products end up having lower internal energy than the reactants, typically reflected by a negative ?H value in reactions.

Endothermic Process

An endothermic process absorbs energy from its surroundings, often as heat, resulting in a positive ?H value. This means that the products have more internal energy than the reactants, and energy must be supplied for the process to occur.

Enthalpy Change (?H)

Enthalpy change is a thermodynamic quantity that indicates the amount of energy absorbed or released during a process at constant pressure. A negative ?H signifies an exothermic reaction where heat is emitted, while a positive ?H indicates an endothermic reaction where heat is absorbed.

Phase Transitions

Phase transitions are changes in the physical state of matter, such as melting, freezing, condensation, and evaporation. These transitions involve energy transfer; processes like melting and evaporation are typically endothermic as they require energy input, while freezing and condensation are exothermic as they release energy.

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