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Topic 9 – Kinetics and Equilibrium
6. Heat energy of reactions: Determining energy change and ∆H of a given reaction
1. Given the equation
Mg + HCl ----------- > MgCl2 + H2 + heat
Which is true of this reaction?
1) It is exothermic in which heat is absorbed
2) It is exothermic in which heat is released
3) It is endothermic in which heat is absorbed
4) It is endothermic in which heat is released
2. Given the reaction
N2(g) + O2(g) + energy ---------- > 2NO(g)
This equation shows that the formation of nitrogen monoxide is
Teacher Preview Copy
Teacher Preview Copy
1) Exothermic, because heat is absorbed
2) Exothermic, because heat is released
3) Endothermic, because heat is absorbed
4) Endothermic, because heat is released
3. Given the reaction
AB + Heat ------------ > A + B
The equation is showing that the reaction is
1) Endothermic, in which the products have less energy than the reactants
2) Endothermic , in which the products have more energy than the reactants
3) Exothermic, in which the products have less energy than the reactants
4) Exothermic, in which the products have more energy than the reactants
4. Given the reaction
2CO(g) + O2(g) ------------- > 2CO2(g) + energy
Which is true of the heat of reaction ( ∆ H)?
1) ∆H is positive because heat is absorbed
2) ∆ H is positive because heat is released
3) ∆H is negative because heat is absorbed
4) ∆H is negative because heat is released
5. Given the reaction: I + I --------------- > I2 + energy
This reaction has
1) + ∆H because the products have less energy than the reactants
2) + ∆H because the products have more energy than the reactants
3) - ∆H because the products have less energy than the reactants
4) - ∆H because the products have more energy than the reactants
6. Given the equation 2H2O (g) + energy --------------- > 2 H2(g) + O2(g)
Which statement is true concerning the potential energy of the products and of the reactants?
1) The products have less energy than the reactants, and ∆H will be negative
2) The products have more energy than the reactants, and ∆H will be positive
3) The products have less energy than the reactants, and ∆H will be positive
4) The products have more energy than the reactants, and ∆H will be negative
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 271
Topic 9 – Kinetics and Equilibrium
6. Heat energy of reactions: Determining energy change and ∆H of a given reaction
1. Given the equation
Mg + HCl ----------- > MgCl2 + H2 + heat
Which is true of this reaction?
1) It is exothermic in which heat is absorbed
2) It is exothermic in which heat is released
3) It is endothermic in which heat is absorbed
4) It is endothermic in which heat is released
2. Given the reaction
N2(g) + O2(g) + energy ---------- > 2NO(g)
This equation shows that the formation of nitrogen monoxide is
Teacher Preview Copy
Teacher Preview Copy
1) Exothermic, because heat is absorbed
2) Exothermic, because heat is released
3) Endothermic, because heat is absorbed
4) Endothermic, because heat is released
3. Given the reaction
AB + Heat ------------ > A + B
The equation is showing that the reaction is
1) Endothermic, in which the products have less energy than the reactants
2) Endothermic , in which the products have more energy than the reactants
3) Exothermic, in which the products have less energy than the reactants
4) Exothermic, in which the products have more energy than the reactants
4. Given the reaction
2CO(g) + O2(g) ------------- > 2CO2(g) + energy
Which is true of the heat of reaction ( ∆ H)?
1) ∆H is positive because heat is absorbed
2) ∆ H is positive because heat is released
3) ∆H is negative because heat is absorbed
4) ∆H is negative because heat is released
5. Given the reaction: I + I --------------- > I2 + energy
This reaction has
1) + ∆H because the products have less energy than the reactants
2) + ∆H because the products have more energy than the reactants
3) - ∆H because the products have less energy than the reactants
4) - ∆H because the products have more energy than the reactants
6. Given the equation 2H2O (g) + energy --------------- > 2 H2(g) + O2(g)
Which statement is true concerning the potential energy of the products and of the reactants?
1) The products have less energy than the reactants, and ∆H will be negative
2) The products have more energy than the reactants, and ∆H will be positive
3) The products have less energy than the reactants, and ∆H will be positive
4) The products have more energy than the reactants, and ∆H will be negative
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 271
