8. Which of the following is true? Fe2O3(s) + 196.5 kcal 2 Fe(s) + 3/2 O2(g) A. Approximately 1.81 x 1024 formula units of Fe2O; are required to react with 393. kcal and this is an endothermic reaction. B. Approximately 2 moles of Fe are produced in the reaction that involves 393 kcal. C. Approximately 223. g of Fe are produced in the reaction that involves 393 kcal. D. Approximately 3.5 moles of O₂ are produced in the reaction that involves 393 kcal. E. More than one of these choices are correct or none of these choices are correct. 9. Which of the following is true concerning the following reaction? Br(g) 2Nal(aq) 2NaBr(aq) Iz(s) A. I:(s) is reduced and is the oxidizing agent and Br(aq) is oxidized and is the reducing agent. B. 12(s) is reduced and is the oxidizing agent and Br(g) is oxidized and is the reducing agent. C. Brz(g) is oxidized and is the reducing agent and I'(aq) is reduced and is the oxidizing agent. D. Brz(g) is reduced and is the oxidizing agent and I'(aq) is oxidized and is the reducing agent. E. None of these choices are correct. 10. Which of the following is true? A. Fluoride ions replace hydrogen ions in hydroxyapatite and this results in the formation of the less acid soluble fluoroapatite. B. Fluoride ions replace calcium ions in hydroxyapatite and this results in the formation of the less acid soluble fluoroapatite. C. Fluoride ions replace hydroxide ions in hydroxyapatite and this results in the formation of the more acid soluble fluoroapatite. D. Fluoride ions replace hydroxide ions in hydroxyapatite and this results in the formation of the less acid soluble fluoroapatite. E. None of these choices are correct.
8. Which of the following is true? Fe2O3(s) + 196.5 kcal 2 Fe(s) + 3/2 O2(g) A. Approximately 1.81 x 1024 formula units of Fe2O; are required to react with 393. kcal and this is an endothermic reaction. B. Approximately 2 moles of Fe are produced in the reaction that involves 393 kcal. C. Approximately 223. g of Fe are produced in the reaction that involves 393 kcal. D. Approximately 3.5 moles of O₂ are produced in the reaction that involves 393 kcal. E. More than one of these choices are correct or none of these choices are correct. 9. Which of the following is true concerning the following reaction? Br(g) 2Nal(aq) 2NaBr(aq) Iz(s) A. I:(s) is reduced and is the oxidizing agent and Br(aq) is oxidized and is the reducing agent. B. 12(s) is reduced and is the oxidizing agent and Br(g) is oxidized and is the reducing agent. C. Brz(g) is oxidized and is the reducing agent and I'(aq) is reduced and is the oxidizing agent. D. Brz(g) is reduced and is the oxidizing agent and I'(aq) is oxidized and is the reducing agent. E. None of these choices are correct. 10. Which of the following is true? A. Fluoride ions replace hydrogen ions in hydroxyapatite and this results in the formation of the less acid soluble fluoroapatite. B. Fluoride ions replace calcium ions in hydroxyapatite and this results in the formation of the less acid soluble fluoroapatite. C. Fluoride ions replace hydroxide ions in hydroxyapatite and this results in the formation of the more acid soluble fluoroapatite. D. Fluoride ions replace hydroxide ions in hydroxyapatite and this results in the formation of the less acid soluble fluoroapatite. E. None of these choices are correct.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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Transcribed Image Text:8. Which of the following is true?
Fe₂O3(s) + 196.5 kcal
2 Fe(s) +
3/2 O2(g)
A. Approximately 1.81 x 1024 formula units of Fe2O3 are required to react with 393. kcal
and this is an endothermic reaction.
B. Approximately 2 moles of Fe are produced in the reaction that involves 393 kcal.
C. Approximately 223. g of Fe are produced in the reaction that involves 393 kcal.
D. Approximately 3.5 moles of O₂ are produced in the reaction that involves 393 kcal.
E. More than one of these choices are correct or none of these choices are correct.
-
9. Which of the following is true concerning the following reaction?
Brz(g)
2Nal(aq)
2NaBr(aq)
1:(s)
A. 1:(s) is reduced and is the oxidizing agent and Br(aq) is oxidized and is the reducing
agent.
B. 12(s) is reduced and is the oxidizing agent and Brz(g) is oxidized and is the reducing
agent.
C. Br2(g) is oxidized and is the reducing agent and I'(aq) is reduced and is the oxidizing
agent.
D. Br₂(g) is reduced and is the oxidizing agent and I'(aq) is oxidized and is the reducing
agent.
E. None of these choices are correct.
10. Which of the following is true?
A. Fluoride ions replace hydrogen ions in hydroxyapatite and this results
in the formation of the less acid soluble fluoroapatite.
B. Fluoride ions replace calcium ions in hydroxyapatite and this results
in the formation of the less acid soluble fluoroapatite.
C. Fluoride ions replace hydroxide ions in hydroxyapatite and this results
in the formation of the more acid soluble fluoroapatite.
D. Fluoride ions replace hydroxide ions in hydroxyapatite and this results
in the formation of the less acid soluble fluoroapatite.
E. None of these choices are correct.
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