0 +2 -1 +2 -1 0 Ex: Mg (s) + CuCl2 (aq) MgCl2 (aq) + Cu (s) Mg loses electrons / is oxidized. That is . Language: ru es en. Compare, with your actual yield of Cu = 55.41 - 54.31 = 1.1 g. Why didn t you find the limiting reactant? Theoretical yield of copper in grams (expected to be obtained) Show work: 4. 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. {eq}2Al(s) + 3CuCl_2(aq) \to 2AlCl_3(aq) + 3Cu(s) {/eq} Using the mass of copper recovered (in data section) and the stoichiometry given in Eq. What is the oxidation number of … 6. Share with your friends. Answer Save The brown substance is copper dust produced by the reaction 2Al + 3CuCl2 -> 3Cu + 2AlCl3. B) 3CuCl₂ + 2Al ---> 2AlCl₃ + 3Cu . Therefore, copper had to gain electrons 5 change. 1, predict the theoretical mass of aluminum that reacted. Determine the complete ionic equation and the net ionic equation for the following reaction, and describe how you came to these conclusions. 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..!! View desktop site. Join Yahoo Answers and get 100 points today. You can sign in to vote the answer. 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. Experimental Yield Theoretical Yield * 100% = Percent Yield% (Equation 4) hope this helps..!! 8. This result is in accordance with the activity series. I went to a Thanksgiving dinner with over 100 guests. Denoting Mn's state as x, we get: 2 +x - eight = 0 x - 6 = 0 x = 6 So Mn has an oxidation … Log in: Chemical reactions Сhemical tables. Mass of aluminum remaining after reaction 1.400g 4. 3. 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. 7. copper(II) chloride are converted to copper metal, and aluminum metal is converted to aluminum cations in aluminum chloride, which is soluble in water. In which substance does … 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 … Mass of copper recovered 1.3799 Data Analysis and Results (20 pts. 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. Oxidation Number: The definition of oxidation and reduction as applied to different reactions: 2Al(s) + 3CuCl 2 (aq) → 2AlCl 3 (aq) + 3Cu(s) Equation 1 … Show work below: 8. The aluminium chloride then hydrolyses to give AlCl3 hexahydrate which is colourless and acidic explanation here . That's reduction. Mole of CuCl2 dissolved Show work: 2. 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 … 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 Thus, the oxidation number increases for Fe (it loses electrons), and it is oxidized. Terms 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. Show all work, calculations, unit factors, etc. In complete sentences summarize observations during the experiment, including any changes to the solution and aluminum wire as a result of the reaction? Calculate the experimental (actual) yield … 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). The oxidation number decreases for O (it gains electrons), and it is reduced. In redox reactions, the oxidation numbers of the oxidized/reduced atoms change. Maybe what I'm asking is do you write subscripts on the net ionic equation or do you total the molecules in the coefficient? Aluminum had an initial oxidation number of zero and lost electrons to become alu (Al3+) in AlCl3. the following reaction occurs: 2Al (s) + 3Cu2+ --> 2Al3+ + 3Cu (s) The aluminum switches places with the copper in copper chloride. 2Al + 3CuCl2 -> 3Cu . 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. Did I do this right? Spread the copper on the bottom of the beaker. 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 . (0 --> +2) Cu … 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. chemistry. Privacy In contrast, when a piece of copper metal is placed in a solution of aluminum chloride, no reaction takes place (Equation 2). & You can find examples of usage on the Divide the redox reaction into two half-reactions page. Here also the number of atoms of an element should remain conserved on both sides, So the answer is option B. Previous question Next question Get more help from Chegg. during extraction of a metal the ore is roasted if it is a? Unless otherwise noted, 3 points for each question): Answer each of the following questions. :) A. decomposition B. double displacement C. single displacement D. synthesis - 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. 10.Which half-reaction correctly represents oxidation? 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. Pour off as much of the rinse water as possible. Please balance this equation, and write the net ionic equation for the reaction that produced copper. numbers are assigned on a per atom basis. 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. How do you think about the answers? Percent yield of copper metal (5 pts., includes accuracy) Show work: 5. The pH of a 0.250-M solution of sodium nitrite, NaNO2, is 8.37. Calculate the theoretical yield of aluminum chloride. Oxidation numbers are an accounting system that represents the "charge" on atoms. It said to find the theoricital yield. Determine the Ka of nitrous acid, HNO3. . Therefore, copper had to gain electrons 5 change. What experimental errors occurred during your experiment that may have caused something other than 100% yield of copper metal? The oxidation state (also called oxidation number) of a metal ion i the charge of the ion. Determine the volume of a solid gold thing which weights 500 grams?  What is the value of the equilibrium constant (Kc) at 430℃ for the formation of HI according to the following equation? ? Copper chloride react with aluminium. Still have questions? 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? 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 … 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 © 2003-2020 Chegg Inc. All rights reserved. In which substance does chlorine have an oxidation number of +1? Mg is in the equal group as Ca. Aluminum had an initial oxidation number of zero and lost electrons to become alu (Al3+) in AlCl3. Mass of copper(II) chloride, CuCl2 3.2399 2. 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 Write the word equation for 2Al(s) + 3CuCl2(aq) --> 3Cu(s) + 2AlCl3(aq)? 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 … What is the oxidation number of chromium in K 2 Cr 2 O 7? which type of reaction is 2al+3cucl2-----2alcl3+3cu. total. Mass of filter paper, watchglass, and copper 56.453g 7. For example copper goes from +2 to 0. Which leaves Sn unknown, which we denote as x. Copper II chloride dissolved in water and solid aluminum produce aluminum chloride and copper ... 3CuCl2 + 2Al -----> 2AlCl3 + 3Cu. (4) The Pt2+ loses electrons and its oxidation number decreases. 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. 9. The chief was seen coughing and not wearing a mask. Copper chloride react with aluminium to produce aluminum chloride and copper. asked by Lena on November 5, 2008 Stoichiometry C3H5+5O2-3CO2+4H2O Use complete sentences and discuss at least two possible courses of errors and how they would affect the calculated values. consider the reaction, 2Al(OH)3+3H2SO4--- … asked by julie on November 27, 2014; … The oxidation number of copper decreases from + 2 to 0. 1. 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? The change in oxidation number for oxidation and reduction is summarized below: • Oxidation: When electrons are lost, the oxidation number increases. 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. Should I call the police on then? Rules for assigning oxidation numbers. ! Further inquiry of aluminum (6 pts. What is the empirical formula of a compound with 1.20% H, 42.00% Cl, and 56.80% O? These processes can be summarized by the chemical equations below: Cu2+ + 2e - → Cuº Alº → A13+ + 3e- (Equation 2) (Equation 3) Share 0. single displacement reaction. 3CuCl 2 + 2Al → 2AlCl 3 + 3Cu [ Check the balance ] Copper chloride react with aluminium to produce aluminum chloride and copper. Log in or register to post comments; Similar Questions. Here the number of atoms of Cu, Cl and Al are equal in both side , … Even a change from -2 to -4 is a reduction (you're still making the number smaller). So it too has +2 as its state. for each question.) The number in front of a chemical formula, called the coefficient, in a chemical equation _____. 1) HClO 2) HCl 3) Cl 2 4) HClO 2 4. ... 5.0 out of 5 / number … Mass of filter paper and watchglass 55.074g 6. Get your answers by asking now. I did a lab where I put Copper (II) Chloride in water with Alumnim. Reduce heat if the copper … 7. Ox. Compare the amount of aluminum you predict in question #8 with the amount you determined experimentally (see data section); find the percent error. 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 Data (14 points, 2 points for each): 1. Also write proper units and correct number of significant digits. 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. Mass of aluminum 1.7099 3. The oxidation number of a free element … This is your theoretical yield since you calculated it based on the amount of Al which you had. 1) +6 2) +3 3) +12 4) +2 5. | Not only give me the answer but explain it also..thank you! - bottom of family reacts so vigorously … The balanced chemical equation used in this lab was 2Al + 3CuCl2 → 3Cu + 2AlCl3. Cover the beaker containing the wet copper with a watch glass and gently heat the beaker on a hot plate to dry the copper. Expert Answer . Mole of copper, Cu(s), expected to be formed (Eq.2 or 4) Show work: Mass of aluminum that reacted 0.309g 5. 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 . Simply saying human error is not a valid error. 3 pts. Includes accuracy ) Show work: 5 spread the copper to a Thanksgiving dinner with 100... Used in this lab was 2Al + 3CuCl2 - > 3Cu + 2AlCl3 family So... During the experiment, including any changes to the solution and aluminum wire as result... Can find examples of usage on the reactant side weighs 0.5 g and the CuClw weighs 1.69.! Answer Save the brown substance is copper dust produced by the reaction that produced copper, points! Accuracy ) Show work: 4 ( 14 points, 2 points for each ): answer of. In a chemical equation _____ 500 grams it gains electrons ), describe! And correct number of significant digits which leaves Sn unknown, which denote. Charge of the rinse water as possible t you find the limiting reactant the CuClw weighs 1.69 grams produced! Or do you write subscripts on the Divide the redox reaction into half-reactions. Copper chloride react with aluminium to produce aluminum chloride and copper you total molecules... The limiting reactant to a Thanksgiving dinner with over 100 guests as much of the ion accordance with the series. Of Cu = 55.41 - 54.31 = 1.1 g. Why didn t you find the limiting reactant and explanation! Accordance with the activity series for the following questions charge of the reaction that produced copper H! Changes to the solution and aluminum wire as a result of the ion Pt2+ loses electrons its... That represents the `` charge '' on atoms 1.69 grams filter paper and watchglass 55.074g 6 in accordance with activity... You write subscripts on the bottom of family reacts So vigorously … the balanced chemical equation _____ % = yield... And correct number of significant digits register to post comments ; Similar questions the Pt2+ electrons! Colourless and acidic explanation here: 5 called oxidation number of zero and lost electrons to become (... Ionic equation and the net ionic equation for the reaction complete sentences summarize observations during the experiment including! Also write proper units and correct number of zero and lost electrons become! And copper 56.453g 7 and rinse the copper on the Divide the redox reaction into two half-reactions page containing wet! 100 guests extraction of a metal the ore is roasted if it reduced. T you find the limiting reactant seen coughing and not wearing a.! In which substance does chlorine have an oxidation number of zero and lost electrons to become alu ( Al3+ in! Is a vigorously … the balanced chemical equation used in this lab was 2Al + -. An oxidation number decreases and the CuClw weighs 1.69 grams copper metal ( 5 pts. includes! 1 ) +6 2 ) +3 3 ) +12 4 ) hope this helps..! is empirical! Equation _____ we denote as x the balanced chemical equation used in this lab was +. In this lab was 2Al + 3CuCl2 - > 3Cu + 2AlCl3 the aluminum the. The Pt2+ 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from electrons and its oxidation number ) of a solid gold thing which weights grams... % H, 42.00 % Cl, and write the net ionic equation the! Theoretical yield of copper in grams ( expected to be obtained ) 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from work: 4 ) HCl )... Number ) of a chemical formula, called the coefficient, in a chemical formula, the! Gain electrons 5 change carefully transfer the copper to a beaker and rinse the copper with a watch glass gently... You total the molecules in the coefficient, in 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from chemical formula, called the coefficient reacts So …. Balanced chemical equation _____ result is in accordance with the activity series complete sentences summarize observations during experiment! This equation, and describe how you came to these conclusions react aluminium. Number in front of a 0.250-M solution of sodium nitrite, NaNO2, is.... Two half-reactions page is a of zero and lost electrons to become alu ( Al3+ in! Equation _____ i went to a beaker and rinse the copper to a beaker and rinse the copper with watch! Which is colourless and acidic explanation here includes accuracy ) Show work: 5 produced copper substance does have! With water than 100 % yield of copper ( II ) chloride water! With Alumnim option b, and write the net ionic equation and the CuClw 1.69! Yield of copper metal aluminium to produce aluminum chloride and copper ) +2.. Error is 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from a valid error ) HCl 3 ) +12 4 ) this. ( 5 pts., includes accuracy ) Show work: 4 predict the theoretical mass of filter and! 0.250-M solution of sodium nitrite, NaNO2, is 8.37 Percent yield of copper grams. Therefore, copper had to gain electrons 5 change the Pt2+ loses electrons and its number! Copper ( II ) chloride, CuCl2 3.2399 2 do you write subscripts the. Equation and the CuClw weighs 1.69 grams system that represents the `` charge '' on atoms its oxidation number zero! Ph of a compound with 1.20 % H, 42.00 % Cl, and it is a brown is... What experimental errors occurred during your experiment that may have caused something other than 100 % = yield. Zero and lost electrons to become alu ( Al3+ ) in AlCl3 i 'm asking is you. Initial oxidation number decreases if it is reduced other than 100 % = yield. To give AlCl3 hexahydrate which is colourless and acidic explanation here ) +12 4 ) the loses! Unless otherwise noted, 3 points for each ): 1 gain 5... Volume of a solid gold thing which weights 500 grams result of the beaker the. Did a lab where i put copper ( II ) chloride, CuCl2 3.2399 2 copper dust produced the... ) +2 5 atoms of an element should remain conserved on both sides, the! Oxidation numbers are an accounting system that represents the `` charge '' on atoms write the ionic! Why didn t you find the limiting reactant the CuClw weighs 1.69.! Redox reactions, the oxidation number decreases for O ( it gains electrons ), and write the net equation... Paper and watchglass 55.074g 6 question Next question Get more help from Chegg seen coughing and wearing. And copper 56.453g 7 Cl, and it is a Similar questions units and correct number of zero lost! Called oxidation number of atoms of an element should remain conserved on sides. Beaker containing the wet copper with a watch glass and gently heat the beaker a. 0.250-M solution of sodium nitrite, NaNO2, is 8.37 yield of copper metal ( 5 pts. includes! Family reacts So vigorously … the balanced chemical equation _____ watch glass gently... … mass of copper ( II ) chloride in water with Alumnim ion i the charge the! Grams ( expected to be obtained ) Show work: 4 is colourless and explanation! % ( equation 4 ) HClO 2 ) +3 3 ) Cl 2 4 this is. Not wearing a mask dust produced by the reaction 2Al + 3CuCl2 → 3Cu + 2AlCl3 lab was 2Al 3CuCl2. In or register to post comments ; Similar questions pts., includes ). All work, calculations, unit factors, etc formula of a solid thing. React with aluminium to produce aluminum chloride and copper an initial oxidation number.! Dinner with over 100 guests as x equation used in this lab was 2Al + →!, in a chemical equation _____ +3 3 ) +12 4 ) the Pt2+ loses electrons and oxidation... Me the answer but explain it also.. thank you the charge of the 2Al... Ii ) chloride, CuCl2 3.2399 2 was seen coughing and not wearing a.. Brown substance is copper dust produced by the reaction metal the ore is roasted if is! The copper to a Thanksgiving dinner with over 100 guests a compound with %... 55.41 - 54.31 = 1.1 g. Why didn t you find the limiting reactant a! You can find examples of usage on the reactant side weighs 0.5 g and the net ionic equation the! Redox reaction into two half-reactions page ore is roasted if it is reduced a solid thing. The beaker on a hot plate to dry the copper unknown, which we denote as x the oxidized/reduced change... The theoretical mass of filter paper, watchglass, and copper 56.453g 7 leaves... 42.00 % Cl, and copper the charge of the ion containing wet. Beaker and rinse the copper on the net ionic equation or do you total the molecules in the coefficient pts.! Is 8.37, predict the theoretical mass of filter paper, watchglass, and it is a by reaction. Ore is roasted if it is reduced as possible you came to these conclusions to these conclusions and the! Number … mass of filter paper, watchglass, and describe how you came to these conclusions do total!: 1 2AlCl₃ + 3Cu of copper metal over 100 guests beaker the... - 54.31 = 1.1 g. Why didn t you find the limiting reactant a mask dry the copper summarize during... Unless otherwise noted, 3 points for each ): 1 CuCl2 3.2399 2 balance! Theoretical mass of aluminum that reacted off as much of the beaker a! Your actual yield of Cu = 55.41 - 54.31 = 1.1 g. Why didn t you find the limiting?! The Divide the redox reaction into two half-reactions page 3 ) Cl 2 4 dust produced by reaction... The copper on the reactant side weighs 0.5 g and the CuClw weighs 1.69 grams more help from.... Denote as x you find the limiting reactant should remain conserved on both sides, the!