The pH of a 0.250-M solution of sodium nitrite, NaNO2, is 8.37. Write the word equation for 2Al(s) + 3CuCl2(aq) --> 3Cu(s) + 2AlCl3(aq)? 3.A sample of matter must be copper if A) charge of an electron B) conductivity of an electron C)location of an electron D) mass of an electron 4.In the electron cloud model of the atom, an orbital is defined as the most probable A)atomic number B) mass number C) number of isotopes D) number of moles 5.The elements on the … 3CuCl2 *2H2O + 2Al = 3Cu + 2AlCl3 + 6H2O Determine the number of grams that should have been produced when 1.25g of copper (2) chloride dehydrate reacts with excess aluminum so i'm not really sure how you're supposed to calculate the number of grams with . Share with your friends. These processes can be summarized by the chemical equations below: Cu2+ + 2e - → Cuº Alº → A13+ + 3e- (Equation 2) (Equation 3) 1) HClO 2) HCl 3) Cl 2 4) HClO 2 4. the following reaction occurs: 2Al (s) + 3Cu2+ --> 2Al3+ + 3Cu (s) The aluminum switches places with the copper in copper chloride. Compare the amount of aluminum you predict in question #8 with the amount you determined experimentally (see data section); find the percent error. So remember that reduction always results in the number getting smaller,(being reduced) and then oxidation must be the other way; that is, the number must be … Should I call the police on then? 10.Which half-reaction correctly represents oxidation? & Compare, with your actual yield of Cu = 55.41 - 54.31 = 1.1 g. Why didn t you find the limiting reactant? We get: 2 + x - 6 = 0 (we look on the complete compound now) x - four = 0 x = 4 So Sn has an oxidation number of +4 5. Log in or register to post comments; Similar Questions. Copper II chloride dissolved in water and solid aluminum produce aluminum chloride and copper ... 3CuCl2 + 2Al -----> 2AlCl3 + 3Cu. equal number of electrons (no electrons lost or gained overall) Oxidation Al Al3+ + 3e-Reduction Cu2+ + 2e-Cu 3 electrons here 2 electrons here 2Al(s) + 3Cu2+(aq) 3Cu(s) + 2Al3+ (aq) to balance we need equal number of electrons easiest to stick with whole numbers Thus we need oxidation half reaction x 2 reduction half … The oxidation number of a free element … Get your answers by asking now. Pour off as much of the rinse water as possible. Percent yield of copper metal (5 pts., includes accuracy) Show work: 5. 3 pts. hope this helps..!! A) decreases B)increases C) remains the same 11.In a chemical reaction, as a species is oxidized, its oxidation number A) decreases B) increases C)remains the same 12.In the reaction H3O+ + OH–® 2 H2O, the oxidation number of oxygen 3. That's reduction. In contrast, when a piece of copper metal is placed in a solution of aluminum chloride, no reaction takes place (Equation 2). Now, change the number of moles of Cu to a mass by multiplying by the molar mass of Cu: 0.01173 moles * 63.54 g/mol = 0.7453 g copper So the expected mass of copper yielded is 0.7453 g. The percentage yield is obtained by dividing the amount of copper you actually get by the amount of copper you … Mole of CuCl2 dissolved Show work: 2. The oxidation state (also called oxidation number) of a metal ion i the charge of the ion. Since the electrons between two carbon atoms are evenly spread, the R group does not change the oxidation number of the carbon atom it's attached to. Simply saying human error is not a valid error. You can find examples of usage on the Divide the redox reaction into two half-reactions page. As you can see, copper in CuCl2 has an oxidation number of +2, while d on the product side has an oxidation number of zero. Answer Save Determine the initial and equilibrium concentrations of HI at 430oC if the initial concentration of H2 and I2 are 0.016 M, and equilibrium c? Share 0. single displacement reaction. How do you think about the answers? What is the empirical formula of a compound with 1.20% H, 42.00% Cl, and 56.80% O? asked by Lena on November 5, 2008 Stoichiometry C3H5+5O2-3CO2+4H2O Oxidation numbers are an accounting system that represents the "charge" on atoms. {eq}2Al(s) + 3CuCl_2(aq) \to 2AlCl_3(aq) + 3Cu(s) {/eq} What is the oxidation number of chromium in K 2 Cr 2 O 7? asked by julie on November 27, 2014; … What is the oxidation number of … Mole of copper, Cu(s), expected to be formed (Eq.2 or 4) Show work: Copper chloride react with aluminium to produce aluminum chloride and copper. Privacy 3CuCl2 (s) + 2Al (s)---> 2AlCl3 (aq) + 3Cu (s) Would it be 3CuCl2 + 2Al ---> 2Al + 2Cl3 + 3Cu or 3CuCl2 + 2Al ---> 2Al + 6Cl + 3Cu or something completely different? The brown substance is copper dust produced by the reaction 2Al + 3CuCl2 -> 3Cu + 2AlCl3. In which substance does … In the reaction 3CuCl2(aq) + 2Al(s) ----> 3 Cu(s) + 2 AlCl3(aq), the amount of Al required to produce 42.4 g of Cu is PLEASE SHOW WORK. Mass of filter paper and watchglass 55.074g 6. Copper chloride react with aluminium. Therefore, copper had to gain electrons 5 change. ! Theoretical yield of copper in grams (expected to be obtained) Show work: 4. Show work below: 8. Join Yahoo Answers and get 100 points today. Further inquiry of aluminum (6 pts. Determine the Ka of nitrous acid, HNO3. . Still have questions? ... 5.0 out of 5 / number … Thus, the oxidation number increases for Fe (it loses electrons), and it is oxidized. B) 3CuCl₂ + 2Al ---> 2AlCl₃ + 3Cu . The balanced chemical equation used in this lab was 2Al + 3CuCl2 → 3Cu + 2AlCl3. Did I do this right? 9. the relative amount of the substance in comparison to the other reactants and products Balance the word equation, solid calcium chloride plus sodium metal yields sodium chloride plus calcium powder. consider the reaction, 2Al(OH)3+3H2SO4--- … As you can see, copper in CuCl2 has an oxidation number of +2, while d on the product side has an oxidation number of zero. This result is in accordance with the activity series. The chief was seen coughing and not wearing a mask. Cover the beaker containing the wet copper with a watch glass and gently heat the beaker on a hot plate to dry the copper. This is your theoretical yield since you calculated it based on the amount of Al which you had. Mass of copper(II) chloride, CuCl2 3.2399 2. Using the mass of copper recovered (in data section) and the stoichiometry given in Eq. For example copper goes from +2 to 0. Use complete sentences and discuss at least two possible courses of errors and how they would affect the calculated values. Even a change from -2 to -4 is a reduction (you're still making the number smaller). Which leaves Sn unknown, which we denote as x. 7. The oxidation number of copper decreases from + 2 to 0. aluminum + copper (II) chloride solution ___> copper + aluminum chloride solution 2Al(s) + 3CuCl2(aq) ___> 3Cu(s) + 2AlCl3(aq) questions:**** help Me **** Using calculations, determine the limiting reactant for this reaction. 0 +2 -1 +2 -1 0 Ex: Mg (s) + CuCl2 (aq) MgCl2 (aq) + Cu (s) Mg loses electrons / is oxidized. Here also the number of atoms of an element should remain conserved on both sides, So the answer is option B. - real example: 3CuCl2 + 2Al 2AlCl3 + 3Cu - aluminum foil placed in solution of copper chloride - copper is replaced by aluminum - more _____ element replaces the less _____ one - Ex.- all alkali metals react with H2O - metal replaces H in H2O - produces H2, OH-, KOH, LiOH, NaOH, etc. The aluminium chloride then hydrolyses to give AlCl3 hexahydrate which is colourless and acidic explanation here . Mass of aluminum remaining after reaction 1.400g 4. Please balance this equation, and write the net ionic equation for the reaction that produced copper. for each question.) | Maybe what I'm asking is do you write subscripts on the net ionic equation or do you total the molecules in the coefficient? Carefully transfer the copper to a beaker and rinse the copper with water. Aluminum had an initial oxidation number of zero and lost electrons to become alu (Al3+) in AlCl3. use the following balanced chemical equation to calculate the theoretical yield of copper: Since the stoichiometric ratio between Al and Cu is 3/2 or 1.5, multiply 0.015 mol by 1.5 to find the mols of Cu: Mass of Cu = 0.023 mol x 63.55 g/mol = 1.5 g = Theoretical yield of Copper. total. 2Al + 3CuCl2 -> 3Cu + 2AlCl3 The aluminum on the reactant side weighs 0.5 g and the CuClw weighs 1.69 grams. 2Al(s) + 3CuCl 2 (aq) → 2AlCl 3 (aq) + 3Cu(s) Equation 1 … (0 --> +2) Cu … 2Al + 3CuCl2 -> 3Cu . View desktop site. 8. The oxidation number decreases for O (it gains electrons), and it is reduced. Terms So it too has +2 as its state. Determine the complete ionic equation and the net ionic equation for the following reaction, and describe how you came to these conclusions. In redox reactions, the oxidation numbers of the oxidized/reduced atoms change. In which substance does chlorine have an oxidation number of +1? Therefore, copper had to gain electrons 5 change. (4) The Pt2+ loses electrons and its oxidation number decreases. Reduce heat if the copper … 2 ; View Full Answer Ths reaction is called the Displacement Recation, since it displaces al displaces the cu which is lower in the reactive series from its salt solution..!! In complete sentences summarize observations during the experiment, including any changes to the solution and aluminum wire as a result of the reaction? 1) +6 2) +3 3) +12 4) +2 5. Language: ru es en. Denoting Mn's state as x, we get: 2 +x - eight = 0 x - 6 = 0 x = 6 So Mn has an oxidation … During this reaction, the oxidation number of Zn changes from 1) +2 to 0 2) 0 to –2 3) –2 to 0 4) 0 to +2 3. Here the number of atoms of Cu, Cl and Al are equal in both side , … I went to a Thanksgiving dinner with over 100 guests. 6. Calculate the theoretical yield of aluminum chloride. Unless otherwise noted, 3 points for each question): Answer each of the following questions. Calculate the experimental (actual) yield … copper(II) chloride are converted to copper metal, and aluminum metal is converted to aluminum cations in aluminum chloride, which is soluble in water. That is . You can sign in to vote the answer. P.S./CHEMISTRY P.S./CHEMISTRY The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PHYSICAL SETTING CHEMISTRY Tuesday, June 25, 2019 — 9:15 a.m to 12:15 p.m., only The possession or use of any communications device is strictly prohibited when © 2003-2020 Chegg Inc. All rights reserved. - bottom of family reacts so vigorously … 1. 3CuCl2(aq) + 2Al(s) + 3Cu(s) + 2AlCl3(aq) (Equation 1) This type of reaction is known as an oxidation-reduction reaction, since the oxidation st ch metals involved changes. which type of reaction is 2al+3cucl2-----2alcl3+3cu. Spread the copper on the bottom of the beaker. Iron is above copper in the series, so will be more likely to form Fe 2 + while converting the Cu 2 + to metallic copper ( Cu 0). Not only give me the answer but explain it also..thank you! Mass of aluminum 1.7099 3. It said to find the theoricital yield. Also write proper units and correct number of significant digits. 3CuCl 2 + 2Al → 2AlCl 3 + 3Cu [ Check the balance ] Copper chloride react with aluminium to produce aluminum chloride and copper. What experimental errors occurred during your experiment that may have caused something other than 100% yield of copper metal? 3CuCl2 *2H2O + 2Al = 3Cu + 2AlCl3 + 6H2O Determine the number of grams that should have been produced when 1.25g of copper (2) chloride dehydrate reacts with excess aluminum so i'm not really sure how you're supposed to calculate the number of grams with . The change in oxidation number for oxidation and reduction is summarized below: • Oxidation: When electrons are lost, the oxidation number increases. Ox. 7. chemistry. numbers are assigned on a per atom basis. Mass of aluminum that reacted 0.309g 5. The number in front of a chemical formula, called the coefficient, in a chemical equation _____. Mass of filter paper, watchglass, and copper 56.453g 7. Rules for assigning oxidation numbers. Mg is in the equal group as Ca. Mass of beaker:54.31g Mass of aluminum foil:0.40g Mass of beaker + copper + h2O:55.41g use the following balanced chemical equation to calculate the theoretical yield of copper: 3CuCl2 + 2Al --> 3u + 2AlCl3 pleaseee helpp! Show all work, calculations, unit factors, etc.  What is the value of the equilibrium constant (Kc) at 430℃ for the formation of HI according to the following equation? ? Oxidation Number: The definition of oxidation and reduction as applied to different reactions: Aluminum had an initial oxidation number of zero and lost electrons to become alu (Al3+) in AlCl3. 1, predict the theoretical mass of aluminum that reacted. during extraction of a metal the ore is roasted if it is a? I did a lab where I put Copper (II) Chloride in water with Alumnim. Previous question Next question Get more help from Chegg. Experimental Data (14 points, 2 points for each): 1. Copper(II) Chloride Copper Chloride Copper(2+) Chloride Cupric Chloride Anhydrous Coclor Copper(II) Chloride (1:2) Copper Chloride (CuCl2) Cupric Dichloride Molar Mass of Cl2Cu Oxidation State of Cl2Cu The limiting reactant was CuCl2, all of the CuCl2 reacted away while there was still Aluminum left over at the end of the experiment. Experimental Yield Theoretical Yield * 100% = Percent Yield% (Equation 4) Determine the volume of a solid gold thing which weights 500 grams? Mass of copper recovered 1.3799 Data Analysis and Results (20 pts. Expert Answer . Log in: Chemical reactions Сhemical tables. :) A. decomposition B. double displacement C. single displacement D. synthesis Given the balanced ionic equation representing a reaction: 2Al3+ (aq) + 3Mg(s) 3Mg 2+ (aq) + 2Al(s) In this reaction, electrons are transferred from (1) Al to Mg 2+ (2) Al3+ to Mg (3) Mg to Al3+ (4) Mg 2+ to Al 10. , etc is 2al+3cucl2 -- -- -2alcl3+3cu substance does chlorine have an oxidation number ) a! Occurred during your experiment that may have caused 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from other than 100 % yield of copper, Cu s... Copper chloride react with aluminium to produce aluminum chloride and copper noted 3! To be formed ( Eq.2 or 4 ) Show work: 3 2 4 copper recovered 1.3799 Data Analysis Results. = 55.41 - 54.31 = 1.1 g. Why didn t you find the limiting reactant you... The reaction expected to be obtained ) Show work: 3 in complete sentences discuss... Copper recovered ( in Data section ) and the stoichiometry given in Eq changes to the solution aluminum. You can find examples of usage on the Divide the redox reaction into two half-reactions page ionic! Previous question Next question Get more help from Chegg error is not a error! A mask zero and lost electrons to become alu ( Al3+ ) AlCl3! Reaction into two half-reactions page aluminium to produce aluminum chloride and copper redox reaction into two half-reactions page (. ) HCl 3 ) +12 4 ) HClO 2 ) HCl 3 ) +12 )... Charge '' on atoms courses of errors and how they would affect calculated... Why didn t you find the limiting reactant is reduced didn t you find the limiting reactant you subscripts... Using the mass of filter paper, watchglass, and write the net ionic equation for the reaction 2Al 3CuCl2. Data Analysis and Results ( 20 pts not a valid error units and number. The solution and aluminum wire as a result of the rinse water as possible for each )! +2 5, expected to be formed ( Eq.2 or 4 ) +2 5 ): each... Is 2al+3cucl2 -- -- -2alcl3+3cu ( also called oxidation number of significant digits mole of copper recovered 1.3799 Data and. This equation, and it is reduced which is colourless and acidic explanation.... Reaction 2Al + 3CuCl2 - > 2AlCl₃ + 3Cu they would affect the calculated values ) Cl 4... Maybe what i 'm asking is do you total the molecules in the coefficient with a watch glass gently... It based on the Divide the redox reaction into two half-reactions page correctly represents oxidation with over 100 guests in. This result is in accordance with the activity series beaker and rinse the.. During your experiment that may have caused something other than 100 % yield of copper decreases from 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from... Molecules in the coefficient mass of copper in grams ( expected to be obtained ) Show work: 3 the... The experiment, including any changes to the solution and aluminum wire as a result of the rinse as... On atoms 1, predict the theoretical mass of copper decreases from + 2 to 0 ( 0 -- +2. And its oxidation number of +1 unless otherwise noted, 3 points for each question ): Answer each the... Find examples of usage on the bottom of the following Questions '' on atoms section ) and the given!, CuCl2 3.2399 2 a compound with 1.20 % H, 42.00 %,!, watchglass, and copper 56.453g 7 t you find the limiting reactant produced by the reaction accordance the. Result of the beaker molecules in the coefficient of copper decreases from + 2 to 0, is.... Your theoretical yield since you calculated it based on the reactant side 0.5! And write the net ionic equation for the reaction 2 4 change -2! The wet copper with a watch glass and gently heat the beaker containing the wet copper with water copper... Copper dust produced by the reaction 2Al + 3CuCl2 - > 2AlCl₃ + 3Cu accounting system represents... Produce aluminum chloride and copper write proper units and correct number of chromium in K 2 Cr 2 O?! Substance does chlorine have an oxidation number of zero and lost electrons to become alu ( Al3+ ) AlCl3. It based on the reactant side weighs 0.5 g and the stoichiometry given in Eq simply human..., which we denote as x ) HCl 3 ) Cl 2 4 question Get more help from Chegg of! Dinner with over 100 guests ) chloride, CuCl2 3.2399 2 in which substance …. Or register to post comments ; Similar Questions summarize observations during the experiment, including changes. Gently heat the beaker containing the wet copper with a watch glass and gently heat beaker... ) +3 3 ) Cl 2 4 ) the Pt2+ loses electrons and its oxidation number of chromium in 2! To -4 is a reduction ( you 're still making the number smaller ) the CuClw weighs 1.69.... Electrons 5 change a compound with 1.20 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from H, 42.00 % Cl and. To produce aluminum chloride and copper coughing and not wearing a mask 2.... + 2AlCl3 formula of a metal the ore is roasted if it 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from a for O it. Hexahydrate which is colourless and acidic explanation here gently heat the beaker aluminum chloride and 56.453g... Question Next question Get more help from Chegg sentences and discuss at least two possible courses of and. Equation, and write the net ionic equation for the reaction that produced copper ) +6 2 HCl... Change from -2 to -4 is a reduction ( you 're still making the number smaller ) a mask (. B ) 3CuCl₂ + 2Al -- - > 2AlCl₃ + 3Cu a metal ore. Hcl 3 ) +12 4 ) Show work: 3 % O what is the oxidation number chromium! Carefully transfer the copper charge '' on atoms error is not a valid error 1.20 % H, 42.00 Cl. Would affect the calculated values -- - > 2AlCl₃ + 3Cu over 100 guests called oxidation number significant! What is the empirical formula of a metal the ore is roasted if it is a, etc an system... 0.250-M solution of sodium nitrite, NaNO2, is 8.37 saying human error is not a valid error reaction. The copper on the amount of Al which you had of errors and how would... Wire as a result of the following Questions didn t you find the limiting reactant solution of sodium,. Unknown, which we denote as x to a Thanksgiving dinner with over guests... And it is reduced dust produced by the reaction 2Al + 3CuCl2 - > 3Cu +.! Total the molecules in the coefficient based on the Divide the redox reaction into two half-reactions.!, including any changes to the solution and aluminum wire as a of... Write proper units and correct number of significant digits the activity series you total the molecules in the coefficient experiment. ( it gains electrons ), expected to be formed ( Eq.2 4! Glass and gently heat the beaker containing the wet copper with a watch glass and gently heat the containing... Divide the redox reaction into two half-reactions page loses electrons and its oxidation number of +1 from + 2 0! Beaker and rinse the copper to a beaker and rinse the copper water... With your actual yield of copper recovered ( in Data section ) and the stoichiometry given in Eq and explanation. Side weighs 0.5 g and the CuClw weighs 1.69 grams 54.31 = 1.1 g. didn... Proper units and correct number of chromium in K 2 Cr 2 O 7 100 % yield Cu... ( it gains electrons ), expected to be formed ( Eq.2 or 4 ) +2.. Copper ( II ) chloride, CuCl2 3.2399 2 find examples of on! 20 pts 're still making the number smaller ) charge of the water! 2 O 7, unit factors, etc points for each question:! Numbers are an accounting system that represents the `` charge '' on atoms aluminum wire a. ) +3 3 ) +12 4 ) HClO 2 ) HCl 3 ) Cl 2 4 brown substance is dust... Changes to the solution and aluminum wire as a result of the ion wet copper with a glass. Half-Reaction correctly represents oxidation to give AlCl3 hexahydrate which is colourless and acidic explanation here aluminium produce! Of errors and how they would affect the calculated values balance this equation, and 56.80 %?... Become alu ( Al3+ ) in AlCl3 your experiment that may have caused something than. Of usage on the Divide the 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from reaction into two half-reactions page yield. Leaves Sn unknown, which we denote as x on atoms beaker containing the wet copper with watch... Total the molecules in the coefficient 500 grams loses electrons and its oxidation of. Recovered 1.3799 Data Analysis and Results ( 20 pts +12 4 ) Show work: 3 reduction ( 're! Of Al which you had decreases for O ( it gains electrons ), to... To gain electrons 5 change the coefficient Divide the redox reaction into two half-reactions page 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from Cu. ) 3CuCl₂ + 2Al -- - > 2AlCl₃ + 3Cu the reaction that produced 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from... ( II ) chloride, CuCl2 3.2399 2 reactant side weighs 0.5 g and the stoichiometry in. Side weighs 0.5 g and the CuClw weighs 1.69 grams the redox into... Making the number smaller ) does chlorine have an oxidation number decreases for O it. Had an initial oxidation number ) of a 0.250-M solution of sodium nitrite,,. Accordance with the activity series 2Al + 3CuCl2 - > 2AlCl₃ + 3Cu dry the copper to a and! Possible courses of errors and how they would affect the calculated values of filter paper, watchglass, write... Experimental errors occurred during your experiment that may have caused something other than 100 yield! Question Next question Get more help from Chegg ) +6 2 ) +3 3 Cl. Is do you total the molecules in the coefficient, 3 points for question. The net ionic equation for the reaction that produced copper this result is in accordance the!
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