Question

1. list 3 examples of energy changes in each of the following categories.

endothermic

definition:

adsorbed. en

examples:

• baking soda + vinear

• ?

exothermic

definition:

released en

examples:

• glowsticks

• bath bomb

• baking soda + citric ac

Explanation:

• Endothermic Definition: Endothermic processes absorb heat from the surroundings.
• Endothermic Examples:
• Melting of ice (heat is absorbed to break the intermolecular forces in solid ice to convert it to liquid water).
• Evaporation of water (heat is taken in to change liquid water to water vapor).
• Reaction of ammonium nitrate with water (the dissolution process absorbs heat, making the solution cooler).
• Exothermic Definition: Exothermic processes release heat to the surroundings.
• Exothermic Examples (correcting the given ones as bath bomb reaction is usually exothermic, but let's add proper ones):
• Combustion of methane (\(CH_4 + 2O_2

ightarrow CO_2+2H_2O\), heat is released).

• Neutralization of hydrochloric acid (\(HCl\)) and sodium hydroxide (\(NaOH\)) (\(HCl + NaOH

ightarrow NaCl + H_2O\), heat is given off).

• Rusting of iron (a slow exothermic redox reaction where iron reacts with oxygen and moisture).

Answer:

• Endothermic Definition: Process that absorbs heat.
• Endothermic Examples: Melting ice, evaporating water, ammonium nitrate - water dissolution.
• Exothermic Definition: Process that releases heat.
• Exothermic Examples: Methane combustion, \(HCl - NaOH\) neutralization, iron rusting.