Are the following processes exothermic or endothermic? a....

Are the following processes exothermic or endothermic? a. When solid KBr is dissolved in water, the solution gets colder. b. Natural gas $\left(\mathrm{CH}_{4}\right)$ is burned in a furnace. c. When concentrated sulfuric acid is added to water, the solution gets very hot. d. Water is boiled in a teakettle.

Are the following processes exothermic or endothermic?
a. When solid KBr is dissolved in water, the solution gets colder.
b. Natural gas $\left(\mathrm{CH}_{4}\right)$ is burned in a furnace.
c. When concentrated sulfuric acid is added to water, the solution gets very hot.
d. Water is boiled in a teakettle.

Key Concepts

Phase Change

Phase changes involve the transition of a substance from one state of matter to another, such as from liquid to gas. These processes often require or release latent heat without necessarily changing the temperature of the substance. Understanding phase changes is essential when examining energy absorption or release during processes like boiling or freezing.

Heat Energy Transfer

Heat energy transfer is the process by which energy in the form of heat moves between a system and its environment. This transfer is central to thermochemistry, helping to explain why reactions are classified as either exothermic or endothermic and how temperature changes result from chemical and physical processes.

Exothermic Reaction

An exothermic reaction releases energy into its surroundings, typically in the form of heat, which leads to a rise in temperature. This characteristic is associated with a negative change in enthalpy (?H < 0), and it is a fundamental concept in thermodynamics and chemical kinetics, explaining energy release in reactions such as combustion and acid dilution.

Endothermic Reaction

An endothermic reaction absorbs energy from its surroundings, usually resulting in a decrease in the system's temperature. It is characterized by a positive change in enthalpy (?H > 0). This concept is important in understanding processes that require energy input, such as certain dissolutions and phase transitions like boiling.

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