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Chapter 18 Review “Reaction Rates and Equilibrium”

Chapter 18 Review “Reaction Rates and Equilibrium”. Chapter 18 Review. Energy that is available to do work is called ____. ____ is defined as the number of atoms, ions, or molecules that react in a given time to form products.

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Chapter 18 Review “Reaction Rates and Equilibrium”

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  1. Chapter 18 Review“Reaction Rates and Equilibrium”

  2. Chapter 18 Review • Energy that is available to do work is called ____. • ____ is defined as the number of atoms, ions, or molecules that react in a given time to form products. • What is the name of the minimum energy that colliding particles must have in order to react?

  3. Chapter 18 Review • A substance that interferes with a catalyst is a(n) ____. • What is the arrangement of atoms at the peak of an energy barrier? • At equilibrium, what is the rate of production of reactants compared with the rate of production of products?

  4. Chapter 18 Review • What is the equilibrium constant expression for the following reaction: C(s) + O2(g)↔ CO2(g) • Which of the following is true about the combustion of carbon: a) the reaction is spontaneous, or b) entropy decreases? • The rate of a chemical reaction normally ____ as reactant concentration increases.

  5. Chapter 18 Review • Why does a higher concentration make a reaction faster? • The amount of disorder in a system is measured by its ____. • Entropy measures ____ • What units represent a reaction rate? • For a complex reaction, the reaction progress curve has several ____.

  6. Chapter 18 Review • What happens to a reaction at equilibrium when more reactant is added to the system? • Which reaction results in the greatest increase in entropy: a) A → B, or b) A → 2B • If a reaction has an equilibrium constant (Keq) just greater than 1, how do we interpret that information?

  7. Chapter 18 Review • A catalyst works by ____. • If sulfur dioxide and oxygen can be made into sulfur trioxide, what is the reverse reaction? • Which variable is NOT required to calculate the Gibbs free-energy change for a chemical reaction: a) change in enthalpy, or b) temperature in oC?

  8. Chapter 18 Review • What is the effect of adding more water to the following equilibrium reaction: CO2 + H2O ↔ H2CO3 • In an endothermic reaction at equilibrium, what is the effect of raising the temperature? • The energy that is available to do work in a reaction is called ____.

  9. Chapter 18 Review • What is the numerical value (+ or -) of Gibbs free-energy change for a spontaneous reaction? • At what stage of a reaction do atoms have the highest energy? • Which of the following systems has the highest entropy: a) 10 mL of water at 50 oC, or b) 10 mL of water at 100 oC?

  10. Chapter 18 Review • What happens to a catalyst in a reaction? • Write the rate law for the following reaction: A + 2B → C + D • An elementary reaction converts reactants to products in ____. • Activation energy is ____. • Is the melting of ice at a temperature above 0 oC: a) endothermic, or b) exothermic?

  11. Chapter 18 Review • Consider the reaction: N2(g) + 3H2(g)↔ 2NH3(g) What is the effect of decreasing the volume on the contained gases? • Spontaneous reactions always ____ free energy. • Why does a higher temperature cause a reaction to go faster?

  12. Chapter 18 Review • What 2 factors determine whether or not a reaction is spontaneous? • If a reaction is reversible, what are the relative amounts of reactant and product at the end of the reaction? • What physical state of nitrogen has the highest entropy? • What is another name for the catalysts in your body?

  13. Chapter 18 Review • What is the order of the following reaction: A + 2B → C + D • Why does a catalyst cause a reaction to proceed faster? • In an equilibrium reaction with a Keq of 1 x 108, the ____ are favored. • Which of the following explains why melting of ice is spontaneous at room temperature and pressure: a) it is accompanied by an increase in entropy, or b) it is accompanied by an increase in energy?

  14. Chapter 18 Review • The Keq of a reaction is 4 x 10-7. At equilibrium, the ____ are favored. • Another name for the activated complex is ____. • Which change would shift the following reaction to the right: 4HCl(g) + O2(g)↔ 2Cl2(g) + 2H2O(g) a) decrease of pressure, or b) increase of pressure?

  15. Chapter 18 Review • In which of these systems is the entropy decreasing: a) salt dissolving in water, or b) a liquid cooling? • Given: 2NClO(g)↔ 2NO(g) + Cl2(g) An analysis of the equilibrium mixture in a 1 L flask is: NClO = 1.6 mol; NO = 6.4 mol; Cl2 = 0.49 mol. Calculate the value of Keq.

  16. Chapter 18 Review • In a two-step reaction mechanism, how many elementary reactions occur?

  17. Chapter 18 Review • A mixture of hydrogen and iodine are in equilibrium with hydrogen iodide, as shown in the equation: H2 + I2↔ 2HI Calculate the concentration of HI when the Keq is 1 x 105, the equilibrium concentration of H2 is 0.04 M, and the equilibrium concentration of I2 is 0.009 M.

  18. Chapter 18 Review End of Chapter 18 Review

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