Introduction to General, Organic and Biochemistry
11th Edition
ISBN: 9781285869759
Author: Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher: Cengage Learning
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Chapter 7, Problem 7.34P
Interpretation Introduction
Interpretation:
Whether an endothermic reaction will be taking place extremely slowly or wouldn’t take place at all should be explained.
Concept Introduction:
For a reaction to take place rapidly the Gibb’s free energy change must be negative.
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○ KINETICS AND EQUILIBRIUM
Drawing the reaction energy diagram of a catalyzed reaction
Sketch a qualitative reaction energy diagram for a chemical reaction with and without a catalyst. Assume the uncatalyzed reaction is exothermic.
Note: Because the sketches are only qualitative, the energies in them don't have to be exact. They only have to have the right relationship to each other. For
example, if one energy is less than another, that fact should be clear in your sketch.
energy
Uncatalyzed reaction
reactants
Ea
reaction coordinate
products
energy
Catalyzed reaction
reactants
Ea
reaction coordinate
0/3
products
Anna was asked to identify and explain if the equation CO2 (l) → CO2 (g) was an endothermic or exothermic reaction. However she got it wrong. What is her error and what should the answer have been?
Anna's statement: The equation is an exothermic reaction because the energy is released from liquid CO2 to the surroundings to become gaseous CO2 causing the molecules to slow down.
Chapter 7 Solutions
Introduction to General, Organic and Biochemistry
Ch. 7.1 - Problem 7-1 In the reaction we measure the...Ch. 7.4 - Problem 7-2 Calculate the rate for the reaction in...Ch. 7.6 - Prob. 7.3PCh. 7.6 - Prob. 7.4PCh. 7.6 - Prob. 7.5PCh. 7.7 - Prob. 7.6PCh. 7.7 - Problem 7-7 Consider the following equilibrium...Ch. 7.7 - Prob. 7.8PCh. 7.7 - Prob. 7.9PCh. 7 - 7-10 The rate of disappearance of HCI was measured...
Ch. 7 - 7-11 Consider the following reaction: Suppose we...Ch. 7 - 7-12 Two kinds of gas molecules are reacted at a...Ch. 7 - 7-13 Why are reactions between ions in aqueous...Ch. 7 - Prob. 7.14PCh. 7 - 7-15 A certain reaction is exothermic by 9...Ch. 7 - 7-16 A quart of milk quickly spoils if left at...Ch. 7 - 7-17 If a certain reaction takes 16 h to go to...Ch. 7 - Prob. 7.18PCh. 7 - Prob. 7.19PCh. 7 - Prob. 7.20PCh. 7 - Prob. 7.21PCh. 7 - 7-22 If you add a piece of marble, CaCO3 to a 6 M...Ch. 7 - Prob. 7.23PCh. 7 - Prob. 7.24PCh. 7 - Prob. 7.25PCh. 7 - 7-26 Write the chemical equations corresponding to...Ch. 7 - Prob. 7.27PCh. 7 - 7-28 When the following reaction reached...Ch. 7 - 7-29 The following reaction was allowed to reach...Ch. 7 - Prob. 7.30PCh. 7 - 7-31 Here are equilibrium constants for several...Ch. 7 - 7-32 A particular reaction has an equilibrium...Ch. 7 - Prob. 7.33PCh. 7 - Prob. 7.34PCh. 7 - 7-35 A reaction has a high rate constant but a...Ch. 7 - 7-36 Complete the following table showing the...Ch. 7 - Prob. 7.37PCh. 7 - Prob. 7.38PCh. 7 - Prob. 7.39PCh. 7 - 7-40 Is there any change in conditions that change...Ch. 7 - 7-41 The equilibrium constant at 1127°C for the...Ch. 7 - Prob. 7.42PCh. 7 - 7-43 (Chemical Connections 7A and 7B) Why is a...Ch. 7 - Prob. 7.44PCh. 7 - 7-45 (Chemical Connections 7C) A painkiller—for...Ch. 7 - 7-46 (Chemical Connections 7D) What reaction takes...Ch. 7 - Prob. 7.47PCh. 7 - Prob. 7.48PCh. 7 - Prob. 7.49PCh. 7 - 7-50 Draw an energy diagram for an exothermic...Ch. 7 - Prob. 7.51PCh. 7 - Prob. 7.52PCh. 7 - Prob. 7.53PCh. 7 - Prob. 7.54PCh. 7 - Prob. 7.55PCh. 7 - Prob. 7.56PCh. 7 - 7-57 Write the reaction to which the following...Ch. 7 - Prob. 7.58PCh. 7 - Prob. 7.59PCh. 7 - Prob. 7.60PCh. 7 - Prob. 7.61PCh. 7 - Prob. 7.62PCh. 7 - Prob. 7.63PCh. 7 - 7-64 As we shall see in Chapter 20, there are two...Ch. 7 - Prob. 7.65PCh. 7 - Prob. 7.66PCh. 7 - Prob. 7.67PCh. 7 - Prob. 7.68PCh. 7 - 7-69 Pure carbon exists is several forms, two of...Ch. 7 - Prob. 7.70PCh. 7 - 7-71 You have a beaker that contains solid silver...Ch. 7 - Prob. 7.72PCh. 7 - Prob. 7.73PCh. 7 - Prob. 7.74PCh. 7 - Prob. 7.75PCh. 7 - Prob. 7.76PCh. 7 - Prob. 7.77PCh. 7 - Prob. 7.78PCh. 7 - Prob. 7.79PCh. 7 - Prob. 7.80PCh. 7 - Prob. 7.81PCh. 7 - 7-82 An equilibrium mixture of O2, SO2, and SO3...Ch. 7 - Prob. 7.83PCh. 7 - Prob. 7.84P
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- 7-69 Pure carbon exists is several forms, two of which are diamond and graphite. The conversion of the diamond form to the graphite form is exothermic to a very slight extent. How is it that jewelers can advertise "Diamonds are forever"?arrow_forward7-17 If a certain reaction takes 16 h to go to completion at 10°C, what temperature should we run it if we want it to go to completion in 1 h?arrow_forward7-46 (Chemical Connections 7D) What reaction takes place when sunlight hits the compound silver chloride?arrow_forward
- 7-22 If you add a piece of marble, CaCO3 to a 6 M HCI solution at room temperature, you will see some bubbles form around the marble as gas slowly rises. If you crush another piece of marble and add it to the same solution at the same temperature, you will see vigorous gas formation, so much so that the solution appears to be boiling. Explain.arrow_forward7-45 (Chemical Connections 7C) A painkiller—for example, Tylenol—can be purchased in two forms, each containing the same amount of drug. One form is a solid coated pill, and the other is a capsule that contains tiny beads and has the same coat. Which medication will act faster? Explain.arrow_forward7-43 (Chemical Connections 7A and 7B) Why is a high fever dangerous? Why is a low body temperature dangerous?arrow_forward
- When a mixture of hydrogen and bromine is maintained at normal atmospheric pressure and heated above 200. °C in a closed container, the hydrogen and bromine react to form hydrogen bromide and a gas-phase equilibrium is established. Write a balanced chemical equation for the equilibrium reaction. Use bond enthalpies from Table 6.2 ( Sec. 6-6b) to estimate the enthalpy change for the reaction. Based on your answers to parts (a) and (b), which is more important in determining the position of this equilibrium, the entropy effect or the energy effect? In which direction will the equilibrium shift as the temperature increases above 200. °C? Explain. Suppose that the pressure were increased to triple its initial value. In which direction would the equilibrium shift? Why is the equilibrium not established at room temperature?arrow_forwardSilicon forms a series of compounds analogous to the al-kanes and having the general formula SinH2n+2. The first of these compounds is silane, SiH4, which is used in the electronics industry to produce thin ultrapure silicon films. SiH4(g) is somewhat difficult to work with because it is py-ropboric at room temperature—meaning that it bursts into flame spontaneously when exposed to air. (a) Write an equation for the combustion of SiH4(g). (The reaction is analogous to hydrocarbon combustion, and SiO2 is a solid under standard conditions. Assume the water produced will be a gas.) (b) Use the data from Appendix E to calculate ? for this reaction. (c) Calculate G and show that the reaction is spontaneous at 25°C. (d) Compare G for this reaction to the combustion of methane. (See the previous problem.) Are the reactions in these two exercises enthalpy or entropy driven? Explain.arrow_forwardThe combustion of methane, is an exothermic process. Therefore, the products of this reaction must possess (higher/ lower) total potential energy than do the reactants.arrow_forward
- Anna was asked to identify and explain if the equation CO2 (g) → CO2 (I) was an endothermic or exothermic reaction. However she got it wrong. What is her error and what should the answer have been? Anna's statement: The equation is an endothermic reaction because the energy is released from gaseous CO2 to the surroundings to become liquidCO, causing the molecules to speed up.arrow_forwardWater can be decomposed to its elements, H₂ and O2, using electrical energy or in a series of chemical reactions. The following sequence of reactions is one possibility: MgBr₂ (s) + H₂O(g) → MgO(s) + 2 HBr(g) Hg(l) + 2 HBr(g) → HgBr₂ (s) + H₂(g) HgBr₂ (s) + MgO(s) → HgO(s) + MgBr₂ (s) HgO(s) → Hg(l) + 1/2 O₂(g) a If you use 4100. kg of water, what mass of H₂ can be produced? kg H₂ Mass=arrow_forwardThe formation of CsClCsCl from Cs(s)Cs(s) and Cl2(g)Cl2(g) involves the following steps: Cs(s)→Cs(g) 12Cl2(g)→Cl(g) Cs(g)→Cs+(g)+e− Cl(g)+e−→Cl−(g) Cs+(g)+Cl−(g)→CsCl(s) Which of these steps absorb energy and which release energy?arrow_forward
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