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Endothermic & Exothermic Reactions quiz

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  • What happens to molecules during an endothermic reaction?
    Molecules absorb thermal energy, speed up, and may break bonds.
  • What is the effect of an endothermic reaction on the temperature of its surroundings?
    It absorbs heat from the surroundings, making the surroundings feel colder.
  • What phase change occurs when a solid absorbs heat in an endothermic reaction?
    The solid melts into a liquid, a process called fusion.
  • What is vaporization in the context of endothermic reactions?
    Vaporization is the phase change from liquid to gas due to heat absorption.
  • What is sublimation in thermochemistry?
    Sublimation is the phase change from solid directly to gas, skipping the liquid phase.
  • How does an energy diagram for an endothermic reaction appear?
    Reactants start at a lower energy and products end at a higher energy, with a positive delta H.
  • What sign does delta H have in an endothermic reaction?
    Delta H is positive in endothermic reactions.
  • What happens to molecules during an exothermic reaction?
    Molecules release thermal energy, slow down, and form bonds.
  • What phase change occurs when a gas releases heat in an exothermic reaction?
    The gas condenses into a liquid, a process called condensation.
  • What is freezing in the context of exothermic reactions?
    Freezing is the phase change from liquid to solid due to heat release.
  • What is deposition in thermochemistry?
    Deposition is the phase change from gas directly to solid, skipping the liquid phase.
  • How does an exothermic reaction feel to the touch?
    It feels warm because heat is released to the surroundings.
  • How does an energy diagram for an exothermic reaction appear?
    Reactants start at a higher energy and products end at a lower energy, with a negative delta H.
  • What sign does delta H have in an exothermic reaction?
    Delta H is negative in exothermic reactions.
  • What is the main difference between endothermic and exothermic reactions regarding energy flow?
    Endothermic reactions absorb energy from surroundings, while exothermic reactions release energy to surroundings.