Gr 11 Physical Sciences: Ch 10 Sum Energy and chemical change
78 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the result of bond breaking during a chemical reaction?

  • The reaction stops
  • Energy is released
  • No energy is involved
  • Energy is absorbed (correct)

    • What is the term for the energy required to break a bond?

  • Bond dissociation energy (correct)
  • Product energy
  • Enthalpy
  • Reaction energy

    • What is the term for the total energy of a chemical system at a given pressure?

  • Bond energy
  • Enthalpy (correct)
  • Product energy
  • Reaction energy

    • What type of reaction releases energy?

    <p>Exothermic reaction</p> Signup and view all the answers

    What is the symbol for the change in enthalpy?

    <p>ΔH</p> Signup and view all the answers

    What happens to the energy of the products in an exothermic reaction?

    <p>It decreases</p> Signup and view all the answers

    What type of reaction absorbs energy?

    <p>Endothermic reaction</p> Signup and view all the answers

    What happens when new bonds form in the products of a reaction?

    <p>Energy is released</p> Signup and view all the answers

    What is the difference in energy between the reactants and the products known as?

    <p>Heat of reaction or enthalpy change</p> Signup and view all the answers

    In an exothermic reaction, what is the sign of ΔH?

    <p>Less than zero</p> Signup and view all the answers

    What is the unit of ΔH?

    <p>kJ/mol</p> Signup and view all the answers

    What is the graphical representation of an exothermic reaction?

    <p>Energy of reactants is higher than that of the products</p> Signup and view all the answers

    What is the minimum amount of energy needed to start a chemical reaction?

    <p>Activation energy</p> Signup and view all the answers

    What is the symbol used to represent the change in enthalpy?

    <p>ΔH</p> Signup and view all the answers

    In an endothermic reaction, what is the sign of ΔH?

    <p>Greater than zero</p> Signup and view all the answers

    What is the energy change in an exothermic reaction?

    <p>Energy is released</p> Signup and view all the answers

    What is the energy change in an endothermic reaction?

    <p>Energy is absorbed</p> Signup and view all the answers

    What is the purpose of activation energy in a chemical reaction?

    <p>To initiate the reaction</p> Signup and view all the answers

    What is the energy change in an exothermic reaction?

    <p>∆H is negative</p> Signup and view all the answers

    What happens to the potential energy in an exothermic reaction?

    <p>It decreases from reactants to products</p> Signup and view all the answers

    What is the role of the activated complex in a reaction?

    <p>It is the highest energy point in the reaction</p> Signup and view all the answers

    What is the energy change in an endothermic reaction?

    <p>∆H is positive</p> Signup and view all the answers

    What happens to the potential energy in an endothermic reaction?

    <p>It increases from reactants to products</p> Signup and view all the answers

    What is the significance of the activation energy in a reaction?

    <p>It is the initial energy input needed to initiate the reaction</p> Signup and view all the answers

    What is the characteristic of an energy diagram for an exothermic reaction?

    <p>The energy decreases from reactants to products</p> Signup and view all the answers

    What is the characteristic of an energy diagram for an endothermic reaction?

    <p>The energy increases from reactants to products</p> Signup and view all the answers

    What is the primary reason for energy changes in chemical reactions?

    <p>Formation and breaking of chemical bonds</p> Signup and view all the answers

    Which of the following statements is true about exothermic reactions?

    <p>Energy is released to the surroundings</p> Signup and view all the answers

    What is the relationship between bond energy and enthalpy?

    <p>Bond energy is a component of enthalpy</p> Signup and view all the answers

    In which type of reaction is the energy of the products higher than the energy of the reactants?

    <p>Endothermic reaction</p> Signup and view all the answers

    What is the energy change in a reaction where the bond energy of the reactants is greater than the bond energy of the products?

    <p>Energy is released</p> Signup and view all the answers

    Which of the following is a characteristic of endothermic reactions?

    <p>Energy is absorbed from the surroundings</p> Signup and view all the answers

    What determines the energy required to break a chemical bond?

    <p>The strength of the bond</p> Signup and view all the answers

    What is the relationship between the energy of the reactants and the energy of the products in an exothermic reaction?

    <p>The energy of the reactants is higher</p> Signup and view all the answers

    What is the energy change in a reaction when the energy of the products is higher than the energy of the reactants?

    <p>Endothermic</p> Signup and view all the answers

    What is the term for the minimum amount of energy needed to start a chemical reaction?

    <p>Activation energy</p> Signup and view all the answers

    In a graphical representation of an exothermic reaction, what happens to the energy level as the reaction progresses?

    <p>It drops down</p> Signup and view all the answers

    What is the significance of the heat of reaction (∆H) in a chemical reaction?

    <p>It indicates the amount of energy released</p> Signup and view all the answers

    What is the characteristic of an energy diagram for an endothermic reaction?

    <p>The energy level rises up</p> Signup and view all the answers

    What is the purpose of the activated complex in a reaction?

    <p>To facilitate bond formation</p> Signup and view all the answers

    In a chemical reaction, what happens to the bonds in the reactants?

    <p>They are broken</p> Signup and view all the answers

    What is the unit of the heat of reaction (∆H)?

    <p>kJ·mol⁻¹</p> Signup and view all the answers

    What is the difference between the energy of the products and the energy of the reactants in an exothermic reaction?

    <p>The energy of the reactants is higher</p> Signup and view all the answers

    What is the significance of the energy change in a chemical reaction?

    <p>All of the above</p> Signup and view all the answers

    What is the primary difference between an exothermic and endothermic reaction in terms of energy?

    <p>The direction of energy change</p> Signup and view all the answers

    What is the role of the activated complex in a reaction?

    <p>It is the highest energy point of the reaction</p> Signup and view all the answers

    Which of the following statements is true about the energy diagram for an exothermic reaction?

    <p>The energy decreases from reactants to products</p> Signup and view all the answers

    What is the significance of the activation energy in a reaction?

    <p>It is the energy required to initiate the reaction</p> Signup and view all the answers

    In an endothermic reaction, what happens to the potential energy?

    <p>It increases from reactants to products</p> Signup and view all the answers

    What is the characteristic of an energy diagram for an endothermic reaction?

    <p>The energy increases from reactants to products</p> Signup and view all the answers

    What is the primary purpose of the energy diagram for a reaction?

    <p>To show the energy changes during the reaction</p> Signup and view all the answers

    What happens to the bonds in the reactants during a chemical reaction?

    <p>They are broken</p> Signup and view all the answers

    What is the primary energy change that occurs in an exothermic reaction?

    <p>Energy is released to the surroundings</p> Signup and view all the answers

    Which of the following best describes the role of the activated complex in a chemical reaction?

    <p>The transient state where old bonds are breaking and new bonds are forming</p> Signup and view all the answers

    What is the significance of the energy diagram for an endothermic reaction?

    <p>It shows the energy absorbed from the surroundings</p> Signup and view all the answers

    What is the primary difference between an exothermic and endothermic reaction in terms of energy?

    <p>The energy change in the reaction</p> Signup and view all the answers

    Which of the following statements is true about the energy change in an exothermic reaction?

    <p>The energy of the products is lower than the energy of the reactants</p> Signup and view all the answers

    What is the primary purpose of the activation energy in a chemical reaction?

    <p>To initiate the reaction</p> Signup and view all the answers

    What is the significance of the energy change in a chemical reaction?

    <p>It determines the spontaneity of the reaction</p> Signup and view all the answers

    Which of the following statements is true about the energy diagram for an exothermic reaction?

    <p>It shows a decrease in potential energy from reactants to products</p> Signup and view all the answers

    In an exothermic reaction, what is the direction of energy change?

    <p>Energy is released to the surroundings</p> Signup and view all the answers

    What is the primary function of the activation energy in a chemical reaction?

    <p>To initiate the reaction by providing the necessary energy</p> Signup and view all the answers

    What is the graphical representation of an endothermic reaction?

    <p>A graph that starts at a low energy level and rises up as the reaction progresses</p> Signup and view all the answers

    What is the relationship between the energy of the reactants and the energy of the products in an endothermic reaction?

    <p>The energy of the reactants is lower than the energy of the products</p> Signup and view all the answers

    What is the characteristic of the energy diagram for an exothermic reaction?

    <p>The energy level decreases as the reaction progresses</p> Signup and view all the answers

    What is the significance of the heat of reaction (∆H) in a chemical reaction?

    <p>It determines the energy change in the reaction</p> Signup and view all the answers

    In an exothermic reaction, what happens to the energy of the reactants?

    <p>The energy of the reactants decreases as the reaction progresses</p> Signup and view all the answers

    What is the primary difference between an exothermic and endothermic reaction in terms of energy?

    <p>The direction of energy change</p> Signup and view all the answers

    What is the role of the activated complex in a reaction?

    <p>To facilitate the reaction by providing an intermediate state</p> Signup and view all the answers

    What determines the energy required to break a chemical bond?

    <p>The bond energy of the reactants</p> Signup and view all the answers

    What is the primary reason for the difference in energy between the reactants and products in an exothermic reaction?

    <p>The formation of stronger bonds in the products</p> Signup and view all the answers

    What is the relationship between the bond energy of the reactants and the energy released in an exothermic reaction?

    <p>The bond energy of the reactants is less than the energy released</p> Signup and view all the answers

    What is the significance of the enthalpy change (ΔH) in an endothermic reaction?

    <p>It represents the energy absorbed by the reaction</p> Signup and view all the answers

    What is the characteristic of the energy diagram for an exothermic reaction?

    <p>The energy level decreases as the reaction progresses</p> Signup and view all the answers

    What is the role of bond energy in determining the energy change in a chemical reaction?

    <p>It determines the difference in energy between the reactants and products</p> Signup and view all the answers

    What is the primary difference between an exothermic and endothermic reaction in terms of energy?

    <p>The direction of energy flow</p> Signup and view all the answers

    What is the significance of the activation energy in a chemical reaction?

    <p>It represents the minimum energy required to start a reaction</p> Signup and view all the answers

    What is the relationship between the energy of the reactants and the energy of the products in an endothermic reaction?

    <p>The energy of the reactants is lower than the energy of the products</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser