The classification depends on whether heat is being absorbed from the environment (endothermic) or released into the environment (exothermic).
Endothermic processes are ones where heat is absorbed, and exothermic processes are ones where heat is released. Here are the corrected examples:
Endothermic reactions (these reactions absorb heat):
- Ice melting into water: Absorbs heat from the environment to change state from solid to liquid.
- An instant ice pack turning cold: Absorbs heat from the surroundings to induce the cooling effect.
Additional examples could include:
- Evaporation of water: Absorbs heat as liquid water changes to vapor.
- Photosynthesis: Plants absorb heat energy to convert carbon dioxide and water into glucose and oxygen.
Exothermic reactions (these reactions release heat):
- Fireworks exploding: Release heat and light energy.
- Gasoline burning: Releases heat energy through combustion.
Additional examples could include:
- Cellular respiration: Cells release heat as glucose is converted into ATP and carbon dioxide.
- Condensation of water vapor: Heat is released as water vapor changes to liquid water.
Now, let's correct any misclassifications in the given list:
- A glow stick glowing is typically an endothermic process because chemical energy is converted to light energy, often requiring heat absorption to initiate.
- A heat pack becoming warm is an exothermic process because it releases heat to its surroundings.
- Gasoline burning is an exothermic process due to the release of heat during combustion.
Therefore, a corrected version of the examples would be:
Endothermic:
- Ice melting into water
- An instant ice pack turning cold
- A glow stick glowing (if it requires heat absorption to activate the chemicals)
- Evaporation of water
- Photosynthesis
Exothermic:
- Fireworks exploding
- Gasoline burning
- A heat pack becoming warm
- Cellular respiration
- Condensation of water vapor