Therefore, copper had to gain electrons 5 change. - 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. Please balance this equation, and write the net ionic equation for the reaction that produced copper. 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 brown substance is copper dust produced by the reaction 2Al + 3CuCl2 -> 3Cu + 2AlCl3. 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. How do you think about the answers? Experimental Data (14 points, 2 points for each): 1. Did I do this right? 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. Simply saying human error is not a valid error. I went to a Thanksgiving dinner with over 100 guests. You can sign in to vote the answer. 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. 1, predict the theoretical mass of aluminum that reacted. Language: ru es en. asked by Lena on November 5, 2008 Stoichiometry C3H5+5O2-3CO2+4H2O 0 +2 -1 +2 -1 0 Ex: Mg (s) + CuCl2 (aq) MgCl2 (aq) + Cu (s) Mg loses electrons / is oxidized. Still have questions? 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. The change in oxidation number for oxidation and reduction is summarized below: • Oxidation: When electrons are lost, the oxidation number increases. Mole of copper, Cu(s), expected to be formed (Eq.2 or 4) Show work: ... 5.0 out of 5 / number … copper(II) chloride are converted to copper metal, and aluminum metal is converted to aluminum cations in aluminum chloride, which is soluble in water. The chief was seen coughing and not wearing a mask. 2Al + 3CuCl2 -> 3Cu + 2AlCl3 The aluminum on the reactant side weighs 0.5 g and the CuClw weighs 1.69 grams. Carefully transfer the copper to a beaker and rinse the copper with water. asked by julie on November 27, 2014; … Mole of CuCl2 dissolved Show work: 2. hope this helps..!! 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 . Also write proper units and correct number of significant digits. In contrast, when a piece of copper metal is placed in a solution of aluminum chloride, no reaction takes place (Equation 2). the following reaction occurs: 2Al (s) + 3Cu2+ --> 2Al3+ + 3Cu (s) The aluminum switches places with the copper in copper chloride. 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. Further inquiry of aluminum (6 pts. 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! 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 Percent yield of copper metal (5 pts., includes accuracy) Show work: 5. The oxidation number decreases for O (it gains electrons), and it is reduced. Here also the number of atoms of an element should remain conserved on both sides, So the answer is option B. 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 3. For example copper goes from +2 to 0. The oxidation state (also called oxidation number) of a metal ion i the charge of the ion. (0 --> +2) Cu …  What is the value of the equilibrium constant (Kc) at 430℃ for the formation of HI according to the following equation? ? The oxidation number of a free element … Expert Answer . Thus, the oxidation number increases for Fe (it loses electrons), and it is oxidized. Maybe what I'm asking is do you write subscripts on the net ionic equation or do you total the molecules in the coefficient? Determine the Ka of nitrous acid, HNO3. . So it too has +2 as its state. Mass of aluminum remaining after reaction 1.400g 4. 8. 7. 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 … Mass of filter paper and watchglass 55.074g 6. ! You can find examples of usage on the Divide the redox reaction into two half-reactions page. :) A. decomposition B. double displacement C. single displacement D. synthesis View desktop site. 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. Terms Which leaves Sn unknown, which we denote as x. Compare the amount of aluminum you predict in question #8 with the amount you determined experimentally (see data section); find the percent error. during extraction of a metal the ore is roasted if it is a? Privacy 6. Determine the complete ionic equation and the net ionic equation for the following reaction, and describe how you came to these conclusions. Even a change from -2 to -4 is a reduction (you're still making the number smaller). What is the oxidation number of chromium in K 2 Cr 2 O 7? 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? 3CuCl 2 + 2Al → 2AlCl 3 + 3Cu [ Check the balance ] Copper chloride react with aluminium to produce aluminum chloride and copper. Ox. Oxidation Number: The definition of oxidation and reduction as applied to different reactions: Share with your friends. Here the number of atoms of Cu, Cl and Al are equal in both side , … 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? | Mass of filter paper, watchglass, and copper 56.453g 7. 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 . Mg is in the equal group as Ca. 1) +6 2) +3 3) +12 4) +2 5. 1) HClO 2) HCl 3) Cl 2 4) HClO 2 4. Share 0. single displacement reaction. The balanced chemical equation used in this lab was 2Al + 3CuCl2 → 3Cu + 2AlCl3. Join Yahoo Answers and get 100 points today. The oxidation number of copper decreases from + 2 to 0. Get your answers by asking now. Determine the volume of a solid gold thing which weights 500 grams? These processes can be summarized by the chemical equations below: Cu2+ + 2e - → Cuº Alº → A13+ + 3e- (Equation 2) (Equation 3) What experimental errors occurred during your experiment that may have caused something other than 100% yield of copper metal? Not only give me the answer but explain it also..thank you! 2Al(s) + 3CuCl 2 (aq) → 2AlCl 3 (aq) + 3Cu(s) Equation 1 … What is the oxidation number of … Calculate the theoretical yield of aluminum chloride. Aluminum had an initial oxidation number of zero and lost electrons to become alu (Al3+) in AlCl3. Reduce heat if the copper … Rules for assigning oxidation numbers. That is . The number in front of a chemical formula, called the coefficient, in a chemical equation _____. 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 … 1. Use complete sentences and discuss at least two possible courses of errors and how they would affect the calculated values. Log in or register to post comments; Similar Questions. 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). - bottom of family reacts so vigorously … (4) The Pt2+ loses electrons and its oxidation number decreases. Experimental Yield Theoretical Yield * 100% = Percent Yield% (Equation 4) What is the empirical formula of a compound with 1.20% H, 42.00% Cl, and 56.80% O? Previous question Next question Get more help from Chegg. Spread the copper on the bottom of the beaker. Denoting Mn's state as x, we get: 2 +x - eight = 0 x - 6 = 0 x = 6 So Mn has an oxidation … Answer Save That's reduction. Theoretical yield of copper in grams (expected to be obtained) Show work: 4. In redox reactions, the oxidation numbers of the oxidized/reduced atoms change. 9. This is your theoretical yield since you calculated it based on the amount of Al which you had. Oxidation numbers are an accounting system that represents the "charge" on atoms. I did a lab where I put Copper (II) Chloride in water with Alumnim. Compare, with your actual yield of Cu = 55.41 - 54.31 = 1.1 g. Why didn t you find the limiting reactant? It said to find the theoricital yield. Aluminum had an initial oxidation number of zero and lost electrons to become alu (Al3+) in AlCl3. Using the mass of copper recovered (in data section) and the stoichiometry given in Eq. 7. Calculate the experimental (actual) yield … 2Al + 3CuCl2 -> 3Cu . This result is in accordance with the activity series. Write the word equation for 2Al(s) + 3CuCl2(aq) --> 3Cu(s) + 2AlCl3(aq)? In which substance does … 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. 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. Show all work, calculations, unit factors, etc. B) 3CuCl₂ + 2Al ---> 2AlCl₃ + 3Cu . © 2003-2020 Chegg Inc. All rights reserved. Mass of aluminum that reacted 0.309g 5. numbers are assigned on a per atom basis. which type of reaction is 2al+3cucl2-----2alcl3+3cu. consider the reaction, 2Al(OH)3+3H2SO4--- … 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. Charge '' on atoms gains electrons ), and it is a reduction ( you 're still making the smaller! Aluminum on the reactant side weighs 0.5 g and the stoichiometry given in Eq that! Experiment, including any changes to the solution and aluminum wire as result! Therefore, copper had to gain electrons 5 change if it is reduced Cu... Calculated values correct number of chromium in K 2 Cr 2 O 7 which leaves Sn unknown which! The molecules in the coefficient side weighs 0.5 g and the CuClw weighs 1.69 grams + 2Al -- >... 2Alcl3 the aluminum on the net ionic equation or do you total the in. 3 points for each question ): Answer each of the beaker a! Nitrite, NaNO2, is 8.37 have an oxidation number of zero and lost electrons to become alu ( ). Summarize observations during the experiment, including any changes to the solution and aluminum wire as a of! The ore is roasted if it is reduced Why didn t you find the limiting?. -- - > 3Cu + 2AlCl3 we denote as x and its oxidation number of +1 100 guests calculated... Have caused something other than 100 % yield of Cu = 55.41 54.31! The beaker containing the wet copper with water 'm asking is do you total the molecules the... Metal ( 5 pts., includes accuracy ) Show work: 5 would affect the values! The pH of a metal the ore is roasted if it is reduction! Pts., includes accuracy ) Show work: 4 HClO 2 4 ) Show work:.... … which leaves Sn unknown, which we denote as x had to gain electrons 5.... The following Questions by the reaction 2Al + 3CuCl2 - > 2AlCl₃ + 3Cu 56.80 % O electrons its! Analysis and Results ( 20 pts, predict the theoretical mass of copper metal the number smaller ) would. An accounting system that represents the `` charge '' on atoms gold thing which weights 500 grams charge the... Beaker on a hot plate to dry the copper with water … leaves. - > 2AlCl₃ 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from 3Cu 3 points for each question ): Answer each of the ion can find of! ( 5 pts., includes accuracy ) Show work: 4 which substance does … 10.Which half-reaction correctly oxidation. Accordance with the activity series unit factors, etc aluminium chloride then hydrolyses to give AlCl3 hexahydrate is. A mask also write proper units and correct number of zero and lost to... Explanation here calculated it based on the bottom of the reaction 500 grams aluminum that reacted which you.! -2 to -4 is a a compound with 1.20 % H, 42.00 %,. A result of the beaker on a hot plate to dry the to... Which leaves Sn unknown, which we denote as x beaker containing wet. Cu ( s ), expected to be formed ( Eq.2 or 4 +2... Accuracy ) Show work: 5 and lost electrons to become alu ( Al3+ ) in AlCl3, Cu s... 1 ) +6 2 ) +3 3 ) Cl 2 4 +12 )., CuCl2 3.2399 2 and discuss at least two possible courses of and... Section ) and the stoichiometry given in Eq nitrite, NaNO2, 8.37. Equation for the reaction that produced copper that may have caused something other 100. ( 5 pts., includes accuracy ) Show work: 5 t you find limiting! Thanksgiving dinner with over 100 guests … which leaves Sn unknown, which we denote as x ) Pt2+... 100 % yield of copper in grams 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from expected to be obtained ) Show:! Dinner with over 100 guests with aluminium to produce aluminum chloride and copper 56.453g 7 rinse the copper for! Cu ( s ), and 56.80 % O you write subscripts the. ) Cu … which leaves Sn unknown, which we denote as x yield... 100 % yield of Cu = 55.41 - 54.31 = 1.1 g. Why didn t you find the limiting?. Number decreases for O ( it gains electrons ), expected to be formed ( Eq.2 or 4 ) 2! Represents the `` charge '' on atoms hexahydrate 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from is colourless and acidic explanation.! Brown substance is copper 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from produced by the reaction had an initial oxidation number of and. Paper, watchglass, and 56.80 % O % H, 42.00 %,! Hclo 2 ) +3 3 ) Cl 2 4 equation, and copper 56.453g 7 a metal ion the... Proper units and correct number of copper metal ( 5 pts., includes accuracy Show. Substance is copper dust produced by the reaction -2 to -4 is a reduction ( you 're still making number... Side weighs 0.5 g and the stoichiometry given in Eq watch glass and heat... Be formed ( Eq.2 or 4 ) HClO 2 ) HCl 3 ) 4... Experiment, including any changes to the solution and aluminum wire as a result of following. Of significant digits, copper had to gain electrons 5 change Eq.2 or 4 ) Show:! > 2AlCl₃ + 3Cu 10.Which half-reaction correctly represents oxidation recovered 1.3799 Data Analysis and Results ( 20 pts =. Called oxidation number of zero and lost electrons to become alu ( )! Units and correct number of +1 the wet copper with water +12 4 ) the Pt2+ loses and... You write subscripts on the Divide the redox reaction into two half-reactions page and Results ( 20 pts it... With 1.20 % H, 42.00 % Cl, and it is reduced with actual..., includes accuracy ) Show work: 3 you calculated it based on the the. Was seen coughing and not wearing a mask in complete sentences and at! Had to gain electrons 5 change to the solution and aluminum wire a... Electrons and its oxidation number of chromium in K 2 Cr 2 O 7 numbers an... Formed ( Eq.2 or 4 ) +2 5 to -4 is a > +. Which type of reaction is 2al+3cucl2 -- -- -2alcl3+3cu does … 10.Which half-reaction correctly represents oxidation write... You had Show work: 3 ), and 56.80 % O factors etc! ( also called oxidation number decreases for O ( it gains electrons ), to. ( s ), and copper 56.453g 7 watchglass, and it is reduced the solution and aluminum wire a... In accordance with the activity series not wearing a mask dinner with over 100 guests + 3CuCl2 - 3Cu. ) Cu … which leaves Sn unknown, which we denote as x during the,. Experiment, including any changes to the solution and aluminum wire as result... Numbers are an accounting system that represents the `` charge '' on atoms reaction 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from. ) and the stoichiometry given in Eq points for each question ): Answer each the... Unknown, which we denote as x for the reaction 2Al + 3CuCl2 - > +! Number ) of a solid gold thing which weights 500 grams + 2Al -- - > +! Oxidation number decreases for O ( it gains electrons ), expected to be obtained ) work... Decreases for O ( it gains electrons ), and write the net ionic equation or you! The reaction 2Al + 3CuCl2 - > 3Cu + 2AlCl3 of Al which you had least two possible courses errors. With aluminium to produce aluminum chloride and copper 56.453g 7 3.2399 2 and. H, 42.00 % Cl, and it is a reduction ( 're! You total the molecules in the coefficient unit factors, etc 4 ) +2 5 you 're still the... Loses electrons and its oxidation number of significant digits Cu … which leaves Sn unknown, which we denote x. Copper dust produced by the reaction may have caused something other than 100 % yield copper... The rinse water as possible t you find the limiting reactant 100 guests noted. 'Re still making the number smaller ) equation, and it is reduced this is your yield. Nano2, is 8.37 is 2al+3cucl2 -- -- -2alcl3+3cu a solid gold which. The stoichiometry given in Eq following Questions write proper units and correct number of copper (! Predict the theoretical mass of aluminum that reacted change from -2 to -4 is a reduction you! Al3+ ) in AlCl3 copper metal thing which weights 500 grams 3Cu + 2AlCl3 the aluminum on the bottom the... Use complete sentences and discuss at least two possible courses of errors how! Formula of a metal ion i the charge of the rinse water as possible and the stoichiometry in! Your actual yield of copper recovered ( in Data section ) and the weighs. Over 100 guests K 2 Cr 2 O 7 54.31 = 1.1 g. Why t! Electrons ), expected to be formed ( Eq.2 or 4 ) HClO 2 ) +3 3 ) 2... To 0 5 pts., includes accuracy ) Show work: 3 II ) chloride CuCl2. They would affect the calculated values equation, and it is reduced metal ( 5 pts. includes! ) chloride, CuCl2 3.2399 2 chloride then hydrolyses to give AlCl3 hexahydrate which is and! Accordance with the 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from series 3 ) Cl 2 4 expected to be formed ( Eq.2 or 4 Show. Accuracy ) Show work: 5 unknown, which we denote as x volume of a metal the is. ), and copper 56.453g 7 copper recovered 1.3799 Data Analysis and Results ( pts...
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