a) Which curve (i, ii, iii, iv or v) corresponds to F2 → 2F- b) Which curve (i, ii, iii, iv or v) corresponds to Cl2 → 2C1- c) Which curve (i, ii, iii, iv or v) corresponds to Br2 → 2Br. d) Which curve (i, ii, iii, iv or v) corresponds to 12 → 21. e) Which curve (i, il, iii, iv or v) corresponds to CH3CH2-H f) The sign of H° for all of these steps is: Opositive Onegative -> Potential Energy Bond Dissocation Energy (BDE): the energy needed to break a bond homolytically (energy input: H>0, a positive energy value) the energy released in forming a bond (energy output: H 0, a negative energy value) → CH3CH2 + H. شکر Reaction coordinate iv

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The sun supplies energy at a rate of about 1.0 kilowatt per square meter of surface area (1 watt =1 J/s). The plants in an agricultural field produce the equivalent of 13 kg of sucrose (C12 H22 O11) per hour per hectare (1 ha : 10,000 m²). Assuming that sucrose is produced by the reaction 12CO2 (g) + 11H2O(1) → C12 H22 O11 (s) + 1202 (g) AH=5640 kJ calculate the percentage of sunlight used to produce the sucrose that is, determine the efficiency of photosynthesis in this field. Percent efficiency %

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determine the products

What is the enthalpy of reaction (in kJ/mol rxn) for CACO3{5) → CaO(s) + CO2(g) if Ca(s) + Cgraphite + 3/2 O21g) → CaCO3(s) with AH;= -1207 kJ/mol Ca(s) + 1/2 O2(g) CaO(s) with AH;= -635.5 kJ/mol Cgraphite + O2(g) → CO2{g) with AH;= -393.5 kJ/mol

The process by which sweat is used to cool the body is endothermic.   True  False

of 15 > For a particular isomer of C,H,3, the combustion reaction produces 5108.7 kJ of heat per mole of C,H,(g) consumed, 18* ander standard conditions. 25 C,H,(8) +0,(8) 8 CO, (g) + 9H,0(g) AH = -5108.7 kJ/mol What is the standard enthalpy of formation of this isomer of C, H,,(g)? AH; = kJ/mol

NE NE OCH3 NaOH(aq) LOEt NaOEt, EtOH 3. H,O heat Ethanolic NaOH 1. CH,MgBr (excess) et₂O 2. H₂O 3. PCC in CH₂Cl₂