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How many electrons are involved in each of the following reactions?
Part A)
2Al2O3→4Al+3O2
Part B)
2ZnO+CO→3CO2+2Zn
A) 2Al2O3 --> 4Al + 3O2
The oxidation state of Al and O atom in Al2O3 are +3 and -2 respectively.
The oxidation state of Al and O2 are 0 and 0 respectively.
So, 4Al+3 + 12e- ---> 4Al
6O2- ---> 3O2 + 12e-
Hence, in the given reaction 12 electrons are involved.
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- Will each of the changes listed increase or decrease the rate of the following chemical reaction? N2+3H22NH3 a. Adding some N2 to the reaction mixture b. Raising the temperature of the reaction mixture c. Removing a catalyst present in the reaction mixture d. Removing some H2 from the reaction mixtureFor each of the changes listed will the rate of the following chemical reaction increase, decrease, or remain the same? Fe(s)+2HCl(aq)FeCl2(aq)+H2(g) a. the concentration of HCl is decreased b. the iron is ground into a powder c. a catalyst is added to the reaction mixture d. the temperature of the solution is decreasedFor an acid-base reaction, what is the reacting species (the ion or molecule that appears in the chemical equation) in the following bases? (a) barium hydroxide (b) trimethylamine (CH3)3N (c) aniline, C6H5NH2 (d) sodium hydroxide
- Classify each of these reactions. Reaction 2 NaOH(aq) + Pb(CIO3)₂(aq) - C₂H₂(g) + 30₂(g) - 2 AgNO3(aq) + Zn(s) HI(aq) + LiOH(aq) 2 NaC1O3(aq) + Pb(OH)₂ (s) 2 CO₂(g) + 2 H₂O(1) Zn(NO3)₂(aq) + 2 Ag(s) H₂O(1) + Lil(aq) redox Answer Bank acid-base neutralization Type precipitationMg(NO3)2 H2SO4→ Ca(NO3)2 H2SO4→ Sr(NO3)2 + H2SO4 → Вa(NOз)2 + H2SO4 →Decomposition Reactions Carbon Reduction Reactions 2 Ag₂O(s)→ 4 Ag(s) + O₂(g) 2 MgO(s) → 2 Mg(s) + O₂(g) 2 Al₂O3(s) → 4 Al(s) + 3 O₂(g) 2 Fe₂O3(s)- 4 Fe(s) + 3 O₂(g) 2 HgO(s) → 2 Hg(1) + O₂(g) 2 Cr₂O3(s) → 4 Cr(s) + 3 O₂(g) Temperature Clear Graph 300 K AH° AS° (kJ) (J/K.mol) +62.2 +132.7 +1202.4 +216.7 +3351.4 +546.8 +1648.4 +551.5 +181.7 +2269.4 +286.8 +548.4 AG°(kJ) -1000 0 1000 2000 3000 300 Temperature (K) 2000 The metals Mg and Al, like most metals in groups 1A, 2A, and 3A of the periodic table, cannot be obtained by chemical reduction with carbon at reasonable temperatures. What process is used to obtain these metals from their ores?
- 6. Identify this reaction. HBr + Al(OH)3→ H20 + AIBR3 + AlBr3 O Combustion Synthesis O Decomposition Double displacement O Single displacementReactions Which type of reaction is indicated by the following formula: 2A920 → 4Ag + O2 O Replacement O Decomposition O SynthesisAmmonia reacts with hydrochloric acid to produce ammonium chloride. Identify the balanced reaction that describes this process. O NH3 + 2HCI → NH¼CI + H O NH3 + 2HCI → NH4CI2 O NH4 + HCI → NH4CI + H NH, + 2HCI→ NH¼CI2 O NH3 + HCI → NH,CI
- Which statement accurately describes the following chemical equation? H2(g) + Cl2(g) → 2 HCI(g) 2 molecules of hydrogen react with 2 molecules of chlorine to produce 1 molecule of hydrogen chloride 1 molecule of hydrogen reacts with 1 molecule of chlorine to produce 2 molecules of hydrogen chloride 2 molecules of hydrogen react with 2 molecules of chlorine to produce 2 molecules of hydrogen chloride O none of the aboveBreathalyzers measure the alcohol (ethanol, C2H6O) content in an exhaled breath using a redox reaction. The C2H6O reacts with an acidic solution of potassium dichromate, forming acetic acid. The color of the solution changesbecause some of the orange chromate is converted to the green Cr3+, and the Breathalyzer measures this color change.C2H6O + Cr2O7 = C2H4O2 + Cr3+ (UNBALANCED)(a) Which reactant is oxidized? Which reactant is reduced?Which reactant is the oxidizing agent? Which reactant is the reducing agent?(b) Balance the redox reaction above that occurs in a Breathalyzer. Note the reaction occurs in acidic conditions.(c) What is E° for the reaction if the standard reduction potential for the acetic acid / ethanol half-reaction is 0.058 V?(Note: see Appendix L in the OpenStax textbook for the reduction potential of the other half-reaction)The Solvay process for the manufacture of sodium carbonate begins by passing ammonia and carbon dioxide through a solution of sodium chloride to make sodium bicarbonate and ammonium chloride. The equation for this reaction is H2O + NaCl + NH3 + CO2 → NH4Cl + NaHCO3 In the next step, sodium bicarbonate is heated to give sodium carbonate and two gases, carbon dioxide and steam. 2NaHCO3 → Na2CO3 + CO2 + H2O What is the theoretical yield of sodium carbonate, expressed in grams, if 128 g of NaCl were used in the first reaction? If 84.4 g of Na2CO3 was obtained, what was the percentage yield?
