Question

15. Classify each of the following chemical changes as an exothermic or endothermic reactions. a. A reaction released 550 J. b. The energy level of the products is higher than that of the reactants c. The metabolism of glucose in the body provides energy. d. The energy level of the products is lower than that of the reactants. e. In the body the synthesis of proteins requires energy. f. CH(8) 202(g) Co,(8) + 2H,O(g) + 802 kJ g. Ca(OH)2(s) +65.3 kJ CaO(s) H2O() h. 2A1(s) Fe,03 (s) Al2O3(s) + 2Fe(s) +850 kJ _ 16.0.400 moles of sucrose, C12H22 O11, contains C atoms. a. 12 b. 6.02x 1023 с. 2.89 х 1024 c. 5.02 x 1022 c. 4.80 17. One mole of copper(II) sulfate, CuSO4, contains moles of O. а. 4 b. 6.02 x 1023 c. 1.51x 1023 c. 2.41 x 1023 c. 2.41 x 1024

Answer 1

Here is the Solution:

We know that • Absorption of heat is endothermic , AH20 when neat is released that is exothermic, AHLO (15), m). A reaction released 550 J "Exothermis' because 550] of energy released. (b). "Endothermic" because the reaction gains energy. (6). The metabolism of glucose provides chergy that means it losses energy so, "Exothermic" (d). "Exothermic" because the heat is given off. (1). "Endothermic" because the synthesis of protein in the body will gain energy. (H). CH4 g + 20, 14 ) ^ + CO2- + + 2H2O + 80 2 ky "Exothermic". Because, -802 kJ of energy released. (G). Ca (OH)2 (s) + 65.3 kJ Cao (s) + H₂O (2) +65.3 kJ energy gained. so, it is "Enothermic" (h) 2Al(s) + Fe2O3 (5) Al2O36) + 2 fegy + 850 kJ. This is Exothermic". 850 kJ energy is given off

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