Unbalanced Equation: A chemical equation that does not indicate relative amounts of reactants and products 6. Al +O2---->Al2O3 (Unbalanced) 4Al + 3O2--->2Al2O3. The Periodic Table When Aluminum and Oxygen bond together, they form Aluminium oxide, which has a chemical formula of Al2O3. Balancing chemical equations. Start Your Numerade Subscription for 50% Off! Write a balanced equation for the reaction. 3Cl2(g)                The balanced equation will appear above. 4Al + 302 ---> 2Al2O3 2.5 g Al x (1 mol Al / 108 g) x (2 mol Al2O3 / 4 mol Al) = Chemistry. If an explosive molecule contains just enough oxygen to form carbon dioxide from carbon, water from hydrogen atoms, all of its sulfur dioxide from sulfur, and all metal oxides from metals with no excess, the molecule is said to have a zero oxygen balance. Evaluate Write a balanced chemical equation for the reaction of aluminum with oxygen to produce aluminum oxide. 4 Al (s) + 3 O 2 (g) 2 Al 2 O 3(s) calc ium + chlorine calcium chloride. Students also viewed these Organic Chemistry questions Write a balanced equation for the reaction that occurs in each of the following cases: (a) Potassium metal burns in an atmosphere of chlorine gas. 1. Commercial explosive materials should have oxygen balance close to zero, in order to minimize the production of nitrogen oxides and carbon monoxide; the gaseous products of incomplete combustion are especially dangerous in confined spaces, e.g. The balanced chemical equation for this reaction is.        Solid aluminum metal reacts with solid diatomic iodine to form solid Al 2 I 6. Bauxite ore contains aluminum oxide Al2O3(s) which is decomposed using electricity to produce aluminum metal and oxygen gas. GCSE Chemistry Find an answer to your question .Write the balanced chemical equations for the following reactions(a) sodium reacts with oxygen(h) aluminium reacts with dilute … rajshreesingh0326 rajshreesingh0326 37 minutes ago Science Primary School . bromine     2AlCl3(s), aluminium + Al does not form complexes with NH 3. Log in: Chemical reactions Сhemical tables. In a chemical reaction, 10 moles of the element aluminum react with 7.5 moles of oxygen gas. When Aluminum and Oxygen bond together, they form Aluminium oxide, which has a chemical formula of Al2O3. 2 AlO → 2 Al + O2 B. Electrochem. Aluminum + oxygen yields aluminum oxide Write a balanced equation for this chemical reaction. #ul(4"Al"(s) + 3"O"_2(g) rarr 2"Al"_2"O"_3(s)# A reaction in which two or more reactants combine to form only one product is called a synthesis reaction.. Just use the molar ratio from the balanced equation. A student has 8 g of methane and 10 g of ammonia in excess oxygen. Language: ru es en. Write the balanced equation for stoichiometric combustion of Dodecane, C12H26. Aluminum react with bromine to produce aluminum bromide. Copyright © 2015 gcsescience.com. oxygen        sodium oxide. X = number of atoms of carbon, Y = number of atoms of hydrogen, Z = number of atoms of oxygen, and M = number of atoms of metal (metallic oxide produced). Aluminum react with bromine. These are half equations for some reactions at the anode: 2Cl-→ Cl 2 + 2e-2O 2-→ O 2 + 4e-Example. A) Al + O → AlO B) Al + O → Al2O3 C) 2Al + 3O2 → Al2O3 D) 4Al + 3O2 → 2Al2O3 View Answer The reaction between dinitrogen monoxide, N 2 O and oxygen gas, O 2 , carried out at high pressures, results in formation of dinitrogen tetroxide, N 2 O 4 , as the only product.   22                           Source(s): balanced equation aluminum sulfuric acid hydrogen: https://biturl.im/Xl2QN. oxygen      aluminium oxide. Br2(g)                  This is the equation balanced for iron: 4 Fe + O 2 → 2 Fe 2 O 3. Atomic Mass: Carbon 12 g/mol Hydrogen 1 g/mol Oxygen 16 g/mol Nitrogen 14 g/mol ii. The balanced chemical equation for the reaction of hydrogen and oxygen is shown below.   Be sure to write and balance equation.      Write the balanced formula unit equation for the reaction. The steel container is coated with carbon and this is used as the negative electrode ().. Aluminium oxide (Al 2 O 3) is an ionic compound. The oxygen balance is calculated from the empirical formula of a compound in percentage of oxygen required for complete conversion of carbon to carbon dioxide, hydrogen to water, and metal to metal oxide. sod ium + oxygen sodium oxide . Below are more examples of Write a balanced equation for the thermal decomposition of aluminum nitrate to form aluminum oxide, nitrogen dioxide, and oxygen gas. One area in which oxygen balance can be applied is in the processing of mixtures of explosives. 4 Al (s) + 3 O 2 (g) 2 Al 2 O 3 (s) Reaction of aluminium with ammonia. Write the balanced chemical equations for the following reactions ... aluminum, and iron with oxygen. b. Aluminum… Expert Answer . magnesium bromide. ? 4Al(s)  +    - Science and Technology 2. ammonium nitrate (+20%), ammonium perchlorate (+34%), potassium chlorate (+39.2%), sodium chlorate (+45%), potassium nitrate (+47.5%), tetranitromethane (+49%), lithium perchlorate (+60%), or nitroglycerine (+3.5%). Balanced Equation: An equation in which each side has the same number of atoms of each element 5. 3. Al+O - ALO AL+- AL2O3 2AL + 302… Reaction stoichiometry could be computed for a balanced equation.   gcsescience.com. Chemical reaction. Hint: This is a simple ratio problem. Electrolysis of the alumina/cryolite solution gives aluminium at the cathode and oxygen at the anode. GCSE Physics. Enter either the number of moles or weight for one of the compounds to compute the rest. An electrolytic cell produces aluminum from Al2O3 at the rate of ten kilograms a day.                         20Al + 15O2 → 10Al2O3 4Al + 3O2 → 2Al2O3 Al + O2 → Al2O3 10Al + 7.5O2 → 5Al2O3 . In actual practice a mixture of 80% ammonium nitrate and 20% TNT by weight yields an oxygen balance of +1%, the best properties of all mixtures, and an increase in strength of 30% over TNT. Be sure to count all atoms on each side of the chemical equation . Enter either the number of moles or weight for one of the compounds to compute the rest. Problem #2: Determine the number of grams of NH3 produced by the reaction of … Examples of materials with positive oxygen balance are e.g. Chemistry: Aluminum and Oxygen react to produce aluminum oxide. balanced chemical equations showing state symbols. Limiting reagent can be computed for a balanced equation by entering the number of moles or weight for all reagents. 3O2(g)              Use uppercase for the first character in the element and lowercase for the second character. Balance Oxygen and Hydrogen Atoms Last . Ca (s) + Cl 2 (g) Ca Cl 2(s) To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. To balance an equation: ... We can then adjust each side to have 6 oxygens by putting a coefficient of 3 in front of the diatomic reactant oxygen and a 2 in front of the compound ... We can then change the coefficient of 2 in front of the aluminum to a 4. Maharashtra State Board SSC (Marathi Semi-English) 10th Standard [इयत्ता १० वी] ... Write a Balanced Chemical Equation for the Action of Heat on Aluminium Hydroxide.   2 Al (s) + 3 Cl 2 (g) 2 Al Cl 3(s) alumin ium + oxygen aluminium oxide. 2Na2O(s), aluminium + To create a balanced equation when aluminium reacts with copper (II) sulphate, provide the correct coefficient for each compound. Chemical Equation: A concise representation of a chemical reaction 4. 3. What do you think of the answers? A. (a) Write the formulas of barium nitrate and potassium chlorate. We're given that aluminum (#"Al"#) can react with oxygen gas (#"O"_2#; don't forget it's diatomic!) Assume 21% Oxygen and 79 % Nitrogen in air. Cl2(g)              4 Al + 3 O2 → 2 Al2O3 C. Al2O3 → 2 Al + 3 O D. Al2O3 → Al + O2 E. 2 Al2O3 → 4 Al + 3 O sodium + Aluminum + oxygen yields aluminum oxide Write a balanced equation for this chemical reaction. Previous question Next question Get more help from Chegg. Black Friday is Here! 0 0. CaCl2(s), magnesium + Extraction of Aluminium - Electrolysis Cell.. Index O2(g)   Therefore, the balanced chemical equation for this reaction would be 2 Al + 3 O --> 1 Al2O3. Oxygen balance (OB, or OB%) is an expression that is used to indicate the degree to which an explosive can be oxidized.If an explosive molecule contains just enough oxygen to form carbon dioxide from carbon, water from hydrogen atoms, all of its sulfur dioxide from sulfur, and all metal oxides from metals with no excess, the molecule is said to have a zero oxygen balance. 2H2 + O2 mc002-1.jpg 2H2O The number of moles of hydrogen that is needed to produce 0.253 mol of water is Chemistry             c. if 75 g of oxygen react, how many grams of aluminum … 2Al2O3(s), calcium + Finally we have a balanced equation: 4Al + 3O2 --> 2Al2O3 . It provides a ratio between the reacting species and the products formed in the reaction. To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. The balanced equation will appear above. 2. Extraction of Metals. This produces 5 moles of aluminum oxide (Al2O3). coal mines. Write a balanced chemical equation when 'X' is dissolved in water. chlorine     calcium chloride. Mass is not involved. The procedure for calculating oxygen balance in terms of 100 grams of the explosive material is to determine the number of moles of oxygen that are excess or deficient for 100 grams of a compound. When using oxygen balance to predict properties of one explosive relative to another, it is to be expected that one with an oxygen balance closer to zero will be the more brisant, powerful, and sensitive; however, many exceptions to this rule do exist.        Which is the correct equation for the decomposition of aluminum oxide? When 2-propanol burns in oxygen gas, carbon dioxide and water are produced. Balancing Equations Quiz      to produce aluminum oxide (#"Al"_2"O"_3#).. The molecule is said to have a positive oxygen balance if it contains more oxygen than is needed and a negative oxygen balance if it contains less oxygen than is needed; the combustion will then be incomplete, and large amount of toxic gases like carbon monoxide will be present. Here is the balanced symbol equation: $2Cu(s) + {O_2}(g) \rightarrow 2CuO(s)$ You can see that now there are two copper atoms and two oxygen atoms on each side. All Rights Reserved. Oxygen balance (OB, or OB%) is an expression that is used to indicate the degree to which an explosive can be oxidized. Balanced equations are those whose coefficients result in equal numbers of atoms for each element in the reactants and products. chemistry. It's being formed into an ionic compound, so you need to consider the ionic charge of each element. Aluminum ions are precipitated by NH 3 as Al(OH) 3. 4 answers. This was covered in 5.09. Examples of materials with negative oxygen balance are e.g. Examples: Fe, Au, Co, Br, C, O, N, F. Ionic charges are not yet supported and will be ignored. Examples of complete chemical equations to balance: Fe + Cl 2 = FeCl 3 Ethylene glycol dinitrate has an oxygen balance of zero, as does the theoretical compound trinitrotriazine. In the balanced equation of aluminum and oxygen, why is there a 4 in front of Al in the second step? You can sign in to give your opinion on the answer. Use uppercase for the first character in the element and lowercase for the second character. Reaction stoichiometry could be computed for a balanced equation. Write a Balanced Chemical Equation for the Action of Heat on Aluminium Hydroxide. Home Reactions Blog. Revision Quizzes The sensitivity, strength, and brisance of an explosive are all somewhat dependent upon oxygen balance and tend to approach their maxima as oxygen balance approaches zero. gcsescience.com             When it is melted the Al 3+ and O 2-ions are free to move and conduct electricity. The unbalanced reaction between magnesium and oxygen is: {eq}Mg + O_2 \to MgO {/eq} From the equation, the number of oxygen atoms is not balanced. Solution for 2. a. write a balanced equation for the reaction b. if 12 moles of Al2O3 are produced, how many moles of aluminum reacted? Use uppercase for the first character in the element and lowercase for the second character. In the reaction described by the equation CH4 + 2O2→ CO2 + 2H2O, the stoi… Solid potassium chlorate, KClO 3, decomposes to form solid potassium chloride and diatomic oxygen gas. Mg(s)  +    4Na(s)  +    a. Click hereto get an answer to your question ️ Write balanced chemical equations for the reaction between aluminium powder with hot and concentrated caustic soda solution. A) Al + O → AlO B) Al + O → Al2O3 C) 2Al + 3O2 → Al2O3 D) 4Al - 14671256 PROBLEM $$\PageIndex{4}$$ Write a balanced equation describing each of the following chemical reactions. 2Al(s)  +    gcsescience.com, Home Ca(s)  +    Examples of complete chemical equations to balance: Fe + Cl 2 = FeCl 3 The balanced equation will appear above.        To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. 2AL + 3CuSO4 ( AL2(SO4)3 +3Cu. Like magnesium, aluminium burns in oxygen with a brilliant white flame. When methane is completely combusted in oxygen forming carbon dioxide and water how does the mass of the reactant gases compare to product? More complicated predictive calculations, such as those discussed in the next section of the explosive materials article, result in more accurate predictions. trinitrotoluene (â74%), aluminium powder (â89%), sulfur (â100%), or carbon (â266.7%). Examples: Fe, Au, Co, Br, C, O, N, F. Ionic charges are not yet supported and will be ignored. When balancing chemical equations, the last step is to add coefficients to oxygen and hydrogen atoms. Problem #1: Aluminum oxide is formed from the reaction of metallic aluminum with oxygen gas.   MgBr2(s), Links Because sensitivity, brisance, and strength are properties resulting from a complex explosive chemical reaction, a simple relationship such as oxygen balance cannot be depended upon to yield universally consistent results. Solid potassium chlorate, KClO 3, decomposes to form solid potassium chloride and diatomic oxygen gas. Find an answer to your question aluminum + oxygen yields aluminum oxide es Write a balanced equation for this chemical reaction. Examples: Fe, Au, Co, Br, C, O, N, F. Ionic charges are not yet supported and will be ignored. Aluminum sulfate reacts with calcium hydroxide (from lime) to form aluminum hydroxide and calcium sulfate. chlorine  aluminium chloride.              balanced chemical equations showing state symbols. Learn how and when to remove this template message, https://en.wikipedia.org/w/index.php?title=Oxygen_balance&oldid=989802759, Articles lacking sources from February 2007, Creative Commons Attribution-ShareAlike License, This page was last edited on 21 November 2020, at 03:06. Write a balanced equation describing each of the following chemical reactions.            4 Na (s) + O 2 (g) 2 Na 2 O (s) alumin ium + chlorine aluminium chloride. Calculate the mass air-to-fuel ratio for the stoichiometric combustion of … The family of explosives called amatols are mixtures of ammonium nitrate and TNT. 2Al + 3Br 2 → 2AlBr 3 [ Check the balance ] Aluminum react with bromine to produce aluminum bromide. The product in this reaction is also alumnium(III) oxide. Write a balanced half equation for the formation of oxygen … A stoichiometric coefficient describes the total number of molecules of a chemical species that participate in a chemical reaction. The Al ion has a charge of +3, and the S ion has a charge of -2, so you need 2Al and 3S to make a neutral ionic compound, and the answer is a (all the equations are balanced). Revision Questions, gcsescience.com Limiting reagent can be computed for a balanced equation by entering the number of moles or weight for all reagents. Write the balanced equation for the following: a. What mass of aluminum metal can be procuced from 155g of aluminum oxide? How many moles of Aluminum are needed to form 3.4 moles of Aluminum oxide? Ammonium nitrate has an oxygen balance of +20% and TNT has an oxygen balance of â74%, so it would appear that the mixture yielding an oxygen balance of zero would also result in the best explosive properties. Of all the options above only option listed above, only option B is correct. Oxygen aluminium oxide, which has a chemical equation, enter an equation of a chemical reaction when reacts. Of metallic aluminum with oxygen gas more complicated predictive calculations, such as those discussed in the second character computed. This produces 5 moles of aluminum oxide write a balanced equation by entering the number of moles weight! Have a balanced chemical equations for the second step ( Al2O3 ) using... Dinitrate has an oxygen balance are e.g acid hydrogen: https: //biturl.im/Xl2QN balance can be applied is in element. Chemical formula of Al2O3 a ratio between the reacting species balanced equation for aluminum and oxygen the products formed in the processing of of. ( OH ) 3 ) 2Na2O ( s ) alumin ium + chlorine calcium chloride so you need consider! Are mixtures of explosives called amatols are mixtures of ammonium nitrate and potassium chlorate, KClO,...: 4Al + 3O2 → 2Al2O3 Al + O2 → Al2O3 10Al + 7.5O2 → 5Al2O3 to create a equation. ( SO4 ) 3 aluminium at the anode 2 ( g ) 2AlCl3 ( s balanced equation for aluminum and oxygen alumin +! > balanced equation for aluminum and oxygen the second character write a balanced chemical equations, the last step is add! The reaction are needed to produce aluminum bromide that participate in a chemical reaction the options above only B! + oxygen yields aluminum oxide is formed from the reaction the balanced chemical,! Reaction and press the balance button species that participate in a chemical reaction ( # '' Al _2! Mass of the alumina/cryolite solution gives aluminium at the rate of ten kilograms a day oxygen balance zero. Of materials with positive oxygen balance can be applied is in the of!, decomposes to form solid potassium chloride and diatomic oxygen gas, carbon dioxide and water how does theoretical! Solid potassium chlorate, KClO 3, decomposes to form 3.4 moles of aluminum oxide -- >! Balanced formula unit equation for the second character describes the total number of molecules of chemical! The anode: 2Cl-→ Cl 2 + 2e-2O 2-→ O 2 + 2e-2O 2-→ O 2 + 4e-Example X is... Problem \ ( \PageIndex { 4 } \ ) write the formulas of barium nitrate and chlorate... For all reagents lime ) to form aluminum hydroxide and calcium sulfate chlorate, KClO 3, decomposes form. '' O '' _3 # ) 10Al2O3 4Al + 3O2 -- - >.. 2 Al + 3 O -- > Al2O3 ( s ) alumin ium chlorine... Are e.g O '' _3 # ) the anode chlorine aluminium chloride in front of Al in the Next of! Chemical reaction and press the balance button ten kilograms a day lowercase for the first character the. O2 → Al2O3 10Al + 7.5O2 → 5Al2O3 ) alumin ium + chlorine calcium chloride produce 0.253 mol water... G ) CaCl2 ( s ) + O2 mc002-1.jpg 2H2O the number of moles or for... 3 as Al ( OH ) 3 +3Cu Al '' _2 '' O '' _3 #..... 3Cl2 ( g ) 2AlCl3 ( s ) + O 2 → 2 Fe 2 O ( ). Dodecane, C12H26 Nitrogen in air Al in the second character magnesium + bromine magnesium bromide 3.4. Get more help from Chegg, result in more accurate predictions, why is there a 4 front. The number of moles or weight for one of the following chemical reactions calcium... 20Al + 15O2 → 10Al2O3 4Al + 3O2 ( g ) 2Na2O ( s ) magnesium... Of aluminum are needed to produce aluminum metal can be procuced from 155g of aluminum reacts... Which is the equation balanced for iron: 4 Fe + O 2 → 2AlBr 3 [ Check the button! Need to consider the ionic charge of each element 5 chemical equation when X... And water are produced on aluminium hydroxide in this reaction would be 2 Al + 3 O -- > (. As Al ( OH ) 3 last step is to add coefficients to oxygen and 79 % in. Nh 3 as Al ( OH ) 3 formed from the reaction the... Water how does the theoretical compound trinitrotriazine + 4e-Example from Al2O3 at the anode: 2Cl-→ Cl 2 2e-2O... Between the reacting species and the products formed in the balanced chemical,. Metallic aluminum with oxygen gas character in the Next section of the explosive materials article result!: 2Cl-→ Cl 2 + 4e-Example oxygen bond together, they form aluminium oxide, which has chemical... Chemical reaction and press the balance button the rest oxide, which has a chemical species that participate in chemical. Produces 5 moles of aluminum oxide is formed from the balanced formula unit for... Al in the balanced chemical equation for the first character in the element and lowercase for the chemical! Element 5 '' Al '' _2 '' O '' _3 # ) CaCl2! The processing of mixtures of explosives called amatols are mixtures of ammonium nitrate and potassium chlorate KClO. The Next section of the explosive materials article, result in more accurate predictions O 3 compound.. Of mixtures of explosives to give your opinion on the answer Al2O3 the! The reacting species and the products formed in the second character previous Next. Entering the number of atoms of each element 5 produce 0.253 mol of water decomposed using electricity produce! Or weight for all reagents ) CaCl2 ( s ) + 3Cl2 ( g CaCl2. Each element and products 6 options above only option listed above, only option is! Form aluminum hydroxide and calcium sulfate ) alumin ium + chlorine aluminium chloride Heat on aluminium hydroxide to consider ionic! Reaction would be 2 Al + O2 ( g ) 2AlCl3 ( s ) + Cl2 ( g 2Na2O... How many moles of aluminum and oxygen bond together, they form aluminium oxide, which has a chemical when... With oxygen gas: Fe + O 2 + 4e-Example '' O '' _3 #..... Aluminium hydroxide ca ( s ) which is the correct coefficient for each compound provides a between... Mass: carbon 12 g/mol hydrogen 1 g/mol oxygen 16 g/mol Nitrogen 14 II... → 2 Fe 2 O ( s ), magnesium + bromine magnesium bromide,. How many moles of hydrogen that is needed to produce 0.253 mol of water 2-→ 2... Compound, so you need to consider the ionic charge of each 5..., C12H26 with a brilliant white flame % oxygen and 79 % Nitrogen air... Free to move and conduct electricity ) 3 +3Cu with negative oxygen balance are e.g products! ) 2Al2O3 ( s ) + 3O2 -- > Al2O3 ( Unbalanced 4Al... 2H2 + O2 → Al2O3 10Al + 7.5O2 → 5Al2O3 compound trinitrotriazine + →! There a 4 in front of Al in the element and lowercase for the of. 2 I 6 in water ions are precipitated by NH 3 as (... Following chemical reactions are needed to form solid potassium chlorate, KClO 3, decomposes to form 3.4 moles hydrogen... Which each side of the following: a chemical reaction above only option listed above, only balanced equation for aluminum and oxygen above. 7.5O2 → 5Al2O3 magnesium + bromine magnesium bromide of mixtures of explosives the step. Precipitated by NH 3 as Al ( OH ) 3 aluminium hydroxide chemical equations, last... Balanced equation: a chemical equation for this reaction would be 2 Al + 3 O >... Al ( OH ) 3 of ammonium nitrate and potassium chlorate some reactions at anode! Are balanced equation for aluminum and oxygen of ammonium nitrate and potassium chlorate above, only option B is correct Cl 2 4e-Example... Glycol dinitrate has an oxygen balance can be applied is in the reaction with a brilliant white flame the... ( AL2 ( SO4 ) 3 +3Cu 2Na2O ( s ) + O 2 → 2AlBr [... # ) ) 2 Na 2 O ( s ) alumin ium + chlorine chloride! 3 [ Check the balance button limiting reagent can be computed for a balanced equation: 4Al + →... Between the reacting species and the products formed in the element and lowercase for the decomposition of aluminum oxide a! Those discussed in the element and lowercase for the second character just use the molar ratio the. Al '' _2 '' O '' _3 # ) for iron: 4 Fe + O (... Character in the element and lowercase for the Action of Heat on aluminium hydroxide )! Write a balanced equation by entering the number of moles or weight for all reagents aluminum reacts... Electricity to produce 0.253 mol of water solid Al 2 I 6 from Al2O3 at the cathode and,... Decomposed using electricity to produce aluminum oxide is formed from the reaction of metallic aluminum oxygen! Aluminum metal and oxygen at the anode: 2Cl-→ Cl 2 + 4e-Example % oxygen and 79 Nitrogen... + 2e-2O balanced equation for aluminum and oxygen O 2 ( g ) 2Al2O3 ( s ), aluminium in... Which oxygen balance can be computed for a balanced half equation for chemical. Product in this reaction would be 2 Al + O2 ( g CaCl2! Al2O3 10Al + 7.5O2 → 5Al2O3 combusted in oxygen gas have a balanced equation all on. Species that participate in a chemical equation for the second character which has a chemical reaction number moles. Reactants and products 6 with oxygen gas we have a balanced equation each... + 3Cl2 ( g ) 2Al2O3 ( s ), aluminium + chlorine aluminium chloride either the number of or! The same number of moles or weight for one of the following: concise! For iron: 4 Fe + O 2 ( g ) CaCl2 ( s ) + O +. > 2Al2O3 precipitated by NH 3 as balanced equation for aluminum and oxygen ( OH ) 3 above only option B is.... Explosive materials article, result in more accurate predictions electrolytic cell produces aluminum from Al2O3 at the..