Gr 11 Physical Sciences: Ch 10.2 Exothermic and endothermic reactions
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Questions and Answers

What is the energy level of the reactants compared to the products in an exothermic reaction?

  • Unchanged
  • Higher (correct)
  • Equal
  • Lower

    • Which of the following statements is true about endothermic reactions?

  • The reaction progresses from a lower to a higher energy level
  • The energy of the reactants is unchanged during the reaction
  • Energy is released from the reactants to the products
  • The energy of the reactants is lower than the energy of the products (correct)

    • What does the symbol ∆H represent in a reaction?

  • The change in enthalpy (correct)
  • The change in volume
  • The change in pressure
  • The change in temperature

    • What is the symbol used to represent the difference in energy between reactants and products?

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

    In an exothermic reaction, what is the relationship between the energy of the reactants and the energy of the products?

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

    What is the direction of the graph in an exothermic reaction?

    <p>Drops down</p> Signup and view all the answers

    What is the sign of ∆H in an endothermic reaction?

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

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

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

    What is the unit of ∆H?

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

    What is the significance of understanding energy changes in chemical reactions?

    <p>It is crucial in comprehending how energy changes drive chemical reactions</p> Signup and view all the answers

    How can the heat of the reaction be written in an equation?

    <p>On either the reactant or product side</p> Signup and view all the answers

    What is the difference between an exothermic and endothermic reaction?

    <p>The amount of energy released or absorbed</p> Signup and view all the answers

    What is the energy change in an exothermic reaction?

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

    What is represented graphically in exothermic and endothermic reactions?

    <p>The energy changes</p> Signup and view all the answers

    What is the result when the energy of the reactants is greater than the energy of the products in a reaction?

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

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

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

    What is the formula for the heat of reaction?

    <p>∆H = E_products - E_reactants</p> Signup and view all the answers

    What is the units of ∆H?

    <p>kJ·mol^(-1)</p> Signup and view all the answers

    How can the heat of the reaction be represented in an equation?

    <p>Either as ∆H = -393 kJ·mol^(-1) or as C(s) + O_2(g) → CO_2(g) + 393 kJ·mol^(-1)</p> Signup and view all the answers

    What is represented graphically in exothermic and endothermic reactions?

    <p>The energy changes</p> Signup and view all the answers

    What is the sign of ∆H in a reaction where energy is released?

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

    What happens to the energy level of the reactants in an endothermic reaction?

    <p>It increases</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 graphical representation of energy changes in reactions?

    <p>A energy level graph</p> Signup and view all the answers

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

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

    What drives chemical reactions according to the concepts of energy changes?

    <p>Energy changes</p> Signup and view all the answers

    In which type of reaction does the graph start at a lower energy level and rises up as the reaction progresses?

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

    Why is understanding energy changes in chemical reactions important?

    <p>To affect both the environment and various industrial processes</p> Signup and view all the answers

    What is the primary difference between the graphical representation of an exothermic reaction and an endothermic reaction?

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

    What is the significance of the energy changes in chemical reactions?

    <p>They affect the environment and industrial processes</p> Signup and view all the answers

    What happens to the energy level of the reactants in a reaction where the energy of the reactants is higher than the energy of the products?

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

    What is the common characteristic of both exothermic and endothermic reactions?

    <p>There is a change in energy</p> Signup and view all the answers

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

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

    What is the relationship between the energy of the reactants and the energy of the products in a reaction where energy is absorbed?

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

    What is the implication of a positive value of ∆H in a reaction?

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

    What is the significance of the sign of ∆H in a reaction?

    <p>It indicates the type of reaction, whether exothermic or endothermic</p> Signup and view all the answers

    What is the difference between the two ways of writing the heat of the reaction in an equation?

    <p>One is for energy release, and the other is for energy absorption</p> Signup and view all the answers

    What is the implication of a negative value of ∆H in a reaction?

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

    What is the purpose of denoting the heat of the reaction with the symbol ∆H?

    <p>To represent the change in enthalpy</p> Signup and view all the answers

    What is the graphical representation of energy changes in exothermic and endothermic reactions?

    <p>A graph with a downward slope for exothermic reactions and an upward slope for endothermic reactions</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

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