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 (D)</p>
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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 (B)</p>
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What is the direction of the graph in an exothermic reaction?

<p>Drops down (C)</p>
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What is the sign of ∆H in an endothermic reaction?

<p>Positive (B)</p>
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In an endothermic reaction, what happens to the energy level of the reactants?

<p>It increases (A)</p>
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What is the unit of ∆H?

<p>kJ/mol (B)</p>
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What is the significance of understanding energy changes in chemical reactions?

<p>It is crucial in comprehending how energy changes drive chemical reactions (C)</p>
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How can the heat of the reaction be written in an equation?

<p>On either the reactant or product side (A)</p>
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What is the difference between an exothermic and endothermic reaction?

<p>The amount of energy released or absorbed (C)</p>
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What is the energy change in an exothermic reaction?

<p>Energy is released from the reaction (A)</p>
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What is represented graphically in exothermic and endothermic reactions?

<p>The energy changes (A)</p>
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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 (C)</p>
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In which type of reaction is the energy of the products greater than the energy of the reactants?

<p>Endothermic reaction (C)</p>
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What is the formula for the heat of reaction?

<p>∆H = E_products - E_reactants (D)</p>
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What is the units of ∆H?

<p>kJ·mol^(-1) (A)</p>
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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) (C)</p>
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What is represented graphically in exothermic and endothermic reactions?

<p>The energy changes (D)</p>
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What is the sign of ∆H in a reaction where energy is released?

<p>Negative (A)</p>
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What happens to the energy level of the reactants in an endothermic reaction?

<p>It increases (B)</p>
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In which type of reaction is the energy of the products higher than the energy of the reactants?

<p>Endothermic reaction (B)</p>
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What is the graphical representation of energy changes in reactions?

<p>A energy level graph (B)</p>
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What is the result of the energy difference between reactants and products in an exothermic reaction?

<p>Energy is released (D)</p>
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What drives chemical reactions according to the concepts of energy changes?

<p>Energy changes (C)</p>
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In which type of reaction does the graph start at a lower energy level and rises up as the reaction progresses?

<p>Endothermic reaction (B)</p>
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Why is understanding energy changes in chemical reactions important?

<p>To affect both the environment and various industrial processes (B)</p>
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What is the primary difference between the graphical representation of an exothermic reaction and an endothermic reaction?

<p>The direction of the graph (A)</p>
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What is the significance of the energy changes in chemical reactions?

<p>They affect the environment and industrial processes (D)</p>
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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 (D)</p>
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What is the common characteristic of both exothermic and endothermic reactions?

<p>There is a change in energy (A)</p>
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What is the result of the energy difference between reactants and products in an endothermic reaction?

<p>Energy is absorbed (B)</p>
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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 (A)</p>
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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 (A)</p>
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What is the implication of a positive value of ∆H in a reaction?

<p>The reaction absorbs energy (B)</p>
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What is the significance of the sign of ∆H in a reaction?

<p>It indicates the type of reaction, whether exothermic or endothermic (C)</p>
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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 (D)</p>
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What is the implication of a negative value of ∆H in a reaction?

<p>The reaction releases energy (D)</p>
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What is the purpose of denoting the heat of the reaction with the symbol ∆H?

<p>To represent the change in enthalpy (C)</p>
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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 (A)</p>
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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 (C)</p>
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