3.4.1 Exothermic and endothermic reactions

Cards (81)

  • What happens to the temperature of the surroundings in an exothermic reaction?
    Increases
  • What is an example of an exothermic reaction?
    Burning of fuels
  • In an endothermic reaction, energy is absorbed
  • Exothermic reactions have a positive enthalpy change (ΔH > 0).
    False
  • What is an example of an endothermic reaction?
    Photosynthesis
  • What happens to the temperature of the surroundings in an exothermic reaction?
    Increases
  • The enthalpy change (ΔH) for exothermic reactions is always negative
  • Sequence the steps involved in an exothermic reaction
    1️⃣ Energy is released to the surroundings
    2️⃣ The temperature of the surroundings increases
    3️⃣ The enthalpy change becomes negative
  • An exothermic reaction releases energy
  • Endothermic reactions cause the temperature of the surroundings to decrease
  • Exothermic reactions have a positive enthalpy change (ΔH > 0).
    False
  • The sign of enthalpy change (ΔH) for an exothermic reaction is negative
  • Endothermic reactions release energy to the surroundings.
    False
  • What is the sign of enthalpy change (ΔH) for an endothermic reaction?
    Positive
  • Match the type of reaction with its characteristics:
    Exothermic ↔️ Releases energy ||| ΔH < 0
    Endothermic ↔️ Absorbs energy ||| ΔH > 0
  • In an exothermic reaction, the temperature of the surroundings increases
  • Exothermic reactions release energy to the surroundings.

    True
  • Give an example of an exothermic reaction.
    Burning of fuels
  • Exothermic reactions increase the temperature of the surroundings.

    True
  • What is the sign of enthalpy change (ΔH) for endothermic reactions?
    Positive
  • Provide an example of an endothermic reaction.
    Photosynthesis
  • Exothermic reactions release energy, resulting in a negative enthalpy change.
  • Endothermic reactions absorb energy from the surroundings.

    True
  • What is the sign of enthalpy change (ΔH) for exothermic reactions?
    Negative
  • Endothermic reactions release energy to the surroundings.absorb
  • Photosynthesis is an example of an endothermic reaction.

    True
  • Exothermic reactions release energy and cause the temperature of the surroundings to increase
  • Enthalpy change (ΔH) is a measure of the energy change during a chemical reaction.

    True
  • Enthalpy Change (ΔH) is a measure of the energy change during a chemical reaction
  • Endothermic reactions have a positive enthalpy change (ΔH < 0).False
  • Exothermic reactions release energy to the surroundings, causing the temperature to increase.

    True
  • Endothermic reactions absorb energy from the surroundings, causing the temperature to decrease.

    True
  • Exothermic reactions release energy, while endothermic reactions absorb energy.
    True
  • The enthalpy change (ΔH) is negative for exothermic reactions.
  • Exothermic reactions are characterized by a positive enthalpy change (ΔH > 0).
    False
  • Exothermic reactions always result in a decrease in temperature.
    False
  • In exothermic reactions, the temperature of the surroundings increases
  • The enthalpy change (ΔH) for exothermic reactions is negative.

    True
  • What is the chemical equation for the burning of methane?
    CH₄ + 2O₂ → CO₂ + 2H₂O
  • Endothermic reactions absorb energy from the surroundings, causing the temperature to decrease.
    True