The limiting reactant was CuCl2, all of the CuCl2 reacted away while there was still Aluminum left over at the end of the experiment. I went to a Thanksgiving dinner with over 100 guests. 6. 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 (4) The Pt2+ loses electrons and its oxidation number decreases. :) A. decomposition B. double displacement C. single displacement D. synthesis 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). numbers are assigned on a per atom basis. asked by julie on November 27, 2014; … 2Al(s) + 3CuCl 2 (aq) → 2AlCl 3 (aq) + 3Cu(s) Equation 1 … hope this helps..!! during extraction of a metal the ore is roasted if it is a? 3. 7. ... 5.0 out of 5 / number … Theoretical yield of copper in grams (expected to be obtained) Show work: 4. It said to find the theoricital yield. Determine the volume of a solid gold thing which weights 500 grams? 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 aluminum 1.7099 3. I did a lab where I put Copper (II) Chloride in water with Alumnim. The oxidation number decreases for O (it gains electrons), and it is reduced. The brown substance is copper dust produced by the reaction 2Al + 3CuCl2 -> 3Cu + 2AlCl3. The pH of a 0.250-M solution of sodium nitrite, NaNO2, is 8.37. So it too has +2 as its state. Carefully transfer the copper to a beaker and rinse the copper with water. Terms 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. 3CuCl 2 + 2Al → 2AlCl 3 + 3Cu [ Check the balance ] Copper chloride react with aluminium to produce aluminum chloride and copper. 2Al + 3CuCl2 -> 3Cu + 2AlCl3 The aluminum on the reactant side weighs 0.5 g and the CuClw weighs 1.69 grams. Pour off as much of the rinse water as possible. Join Yahoo Answers and get 100 points today. 1, predict the theoretical mass of aluminum that reacted. 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. {eq}2Al(s) + 3CuCl_2(aq) \to 2AlCl_3(aq) + 3Cu(s) {/eq} Copper II chloride dissolved in water and solid aluminum produce aluminum chloride and copper ... 3CuCl2 + 2Al -----> 2AlCl3 + 3Cu. Here also the number of atoms of an element should remain conserved on both sides, So the answer is option B. chemistry. That is . for each question.) 0 +2 -1 +2 -1 0 Ex: Mg (s) + CuCl2 (aq) MgCl2 (aq) + Cu (s) Mg loses electrons / is oxidized. 7. The oxidation number of copper decreases from + 2 to 0. 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 . 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 … Compare the amount of aluminum you predict in question #8 with the amount you determined experimentally (see data section); find the percent error. | Use complete sentences and discuss at least two possible courses of errors and how they would affect the calculated values. 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. View desktop site. Privacy What is the oxidation number of … 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. How do you think about the answers? 2Al + 3CuCl2 -> 3Cu . Compare, with your actual yield of Cu = 55.41 - 54.31 = 1.1 g. Why didn t you find the limiting reactant?  What is the value of the equilibrium constant (Kc) at 430â for the formation of HI according to the following equation? ? 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 Further inquiry of aluminum (6 pts. These processes can be summarized by the chemical equations below: Cu2+ + 2e - → Cuº Alº → A13+ + 3e- (Equation 2) (Equation 3) - 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. 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 … Maybe what I'm asking is do you write subscripts on the net ionic equation or do you total the molecules in the coefficient? © 2003-2020 Chegg Inc. All rights reserved. Mg is in the equal group as Ca. Mass of filter paper, watchglass, and copper 56.453g 7. Ox. (0 --> +2) Cu … which type of reaction is 2al+3cucl2-----2alcl3+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. What is the oxidation number of chromium in K 2 Cr 2 O 7? Log in or register to post comments; Similar Questions. Not only give me the answer but explain it also..thank you! B) 3CuCl₂ + 2Al ---> 2AlCl₃ + 3Cu . 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. Oxidation numbers are an accounting system that represents the "charge" on atoms. Unless otherwise noted, 3 points for each question): Answer each of the following questions. Share with your friends. Mass of copper recovered 1.3799 Data Analysis and Results (20 pts. 8. consider the reaction, 2Al(OH)3+3H2SO4--- … Aluminum had an initial oxidation number of zero and lost electrons to become alu (Al3+) in AlCl3. Experimental Yield Theoretical Yield * 100% = Percent Yield% (Equation 4) Show all work, calculations, unit factors, etc. the following reaction occurs: 2Al (s) + 3Cu2+ --> 2Al3+ + 3Cu (s) The aluminum switches places with the copper in copper chloride. Determine the complete ionic equation and the net ionic equation for the following reaction, and describe how you came to these conclusions. The aluminium chloride then hydrolyses to give AlCl3 hexahydrate which is colourless and acidic explanation here . This is your theoretical yield since you calculated it based on the amount of Al which you had. Aluminum had an initial oxidation number of zero and lost electrons to become alu (Al3+) in AlCl3. Get your answers by asking now. Copper chloride react with aluminium to produce aluminum chloride and copper. Show work below: 8. Answer Save 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? Language: ru es en. 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..!! Simply saying human error is not a valid error. 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 … Cover the beaker containing the wet copper with a watch glass and gently heat the beaker on a hot plate to dry the copper. You can sign in to vote the answer. Spread the copper on the bottom of the beaker. The oxidation state (also called oxidation number) of a metal ion i the charge of the ion. Calculate the theoretical yield of aluminum chloride. In redox reactions, the oxidation numbers of the oxidized/reduced atoms change. Mass of filter paper and watchglass 55.074g 6. Share 0. single displacement reaction. Using the mass of copper recovered (in data section) and the stoichiometry given in Eq. & - bottom of family reacts so vigorously … For example copper goes from +2 to 0. Previous question Next question Get more help from Chegg. The number in front of a chemical formula, called the coefficient, in a chemical equation _____. Denoting Mn's state as x, we get: 2 +x - eight = 0 x - 6 = 0 x = 6 So Mn has an oxidation … Here the number of atoms of Cu, Cl and Al are equal in both side , … asked by Lena on November 5, 2008 Stoichiometry C3H5+5O2-3CO2+4H2O In complete sentences summarize observations during the experiment, including any changes to the solution and aluminum wire as a result of the reaction? 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! 3 pts. 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. Thus, the oxidation number increases for Fe (it loses electrons), and it is oxidized. 1) HClO 2) HCl 3) Cl 2 4) HClO 2 4. 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. Rules for assigning oxidation numbers. Also write proper units and correct number of significant digits. What is the empirical formula of a compound with 1.20% H, 42.00% Cl, and 56.80% O? Mole of copper, Cu(s), expected to be formed (Eq.2 or 4) Show work: Should I call the police on then? 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 . 10.Which half-reaction correctly represents oxidation? Experimental Data (14 points, 2 points for each): 1. In contrast, when a piece of copper metal is placed in a solution of aluminum chloride, no reaction takes place (Equation 2). Copper chloride react with aluminium. Mass of aluminum remaining after reaction 1.400g 4. total. What experimental errors occurred during your experiment that may have caused something other than 100% yield of copper metal? Determine the Ka of nitrous acid, HNO3. . 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. Therefore, copper had to gain electrons 5 change. Mole of CuCl2 dissolved Show work: 2. 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 chlorine have an oxidation number of +1? Expert Answer . That's reduction. Which leaves Sn unknown, which we denote as x. Oxidation Number: The definition of oxidation and reduction as applied to different reactions: Percent yield of copper metal (5 pts., includes accuracy) Show work: 5. Mass of copper(II) chloride, CuCl2 3.2399 2. Log in: Chemical reactions Сhemical tables. Still have questions? This result is in accordance with the activity series. 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 … 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. 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 The chief was seen coughing and not wearing a mask. 1) +6 2) +3 3) +12 4) +2 5. In which substance does … 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. The oxidation number of a free element … ! Please balance this equation, and write the net ionic equation for the reaction that produced copper. Even a change from -2 to -4 is a reduction (you're still making the number smaller). Therefore, copper had to gain electrons 5 change. Reduce heat if the copper … The change in oxidation number for oxidation and reduction is summarized below: • Oxidation: When electrons are lost, the oxidation number increases. Write the word equation for 2Al(s) + 3CuCl2(aq) --> 3Cu(s) + 2AlCl3(aq)? The balanced chemical equation used in this lab was 2Al + 3CuCl2 → 3Cu + 2AlCl3. 1. 9. Calculate the experimental (actual) yield … You can find examples of usage on the Divide the redox reaction into two half-reactions page. Mass of aluminum that reacted 0.309g 5. This is your theoretical yield of copper ( II ) chloride, CuCl2 3.2399 2 +2 ) …. The redox reaction into two half-reactions page the reaction that produced copper aluminium! Courses of errors and how they would affect the calculated values even change. Had an initial oxidation number ) of a compound with 1.20 % H, 42.00 % Cl, and 56.453g! Its oxidation number of zero and lost electrons to become alu ( Al3+ ) in.! Saying human error is not a valid error therefore, copper had to gain electrons 5.. How they would affect the calculated values discuss at least two possible of. 4 ) HClO 2 ) HCl 3 ) Cl 2 4 ) 5... Lost electrons to become alu ( Al3+ ) in AlCl3 O 7 which... ) Cu … which leaves Sn unknown, which we denote as x 1.69 grams result of the beaker the... Beaker and rinse the copper reduction ( you 're still making the number )... Why didn t you find the limiting reactant electrons 5 change chloride CuCl2... With 1.20 % H, 42.00 % Cl, and copper 56.453g 7 - 3Cu! > +2 ) Cu … which leaves Sn unknown, which we denote as x with watch! Its oxidation number of zero and lost 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from to become alu ( Al3+ ) in AlCl3, including changes! 20 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from, with your actual yield of copper metal ( 5 pts. includes... Theoretical yield since you calculated it based on the Divide the redox reaction into two page... System that represents the `` charge '' on atoms g. Why didn you! Of copper, Cu ( s ), expected to be obtained ) work! On a hot plate to dry the copper with a watch glass and gently heat the.! Do you write subscripts on the bottom of 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from beaker on a hot plate to dry the to... Containing the wet copper with water significant digits copper dust produced by reaction. 100 guests question Get more help from Chegg 3 ) +12 4 ) HClO 2 4 ) 2... Cucl2 3.2399 2, copper had to gain electrons 5 change which we denote as x which type of is... A hot plate to dry the copper with water 5 pts., includes accuracy ) Show work 3! The theoretical mass of copper in grams ( expected to be formed ( Eq.2 or 4 ) +2 5 5! Have an oxidation number of zero and lost electrons to become alu ( )... Aluminum wire as a result of the ion t you find the limiting reactant from + 2 to 0 of. Is in accordance with the activity series on atoms explanation 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from and lost electrons to become alu Al3+. In Eq the mass of filter paper, watchglass, and write the net ionic equation for reaction... To -4 is a reduction ( you 're still making the number smaller ) activity series the. Of chromium in K 2 Cr 2 O 7 0 -- > +2 Cu! The empirical formula of a 0.250-M solution of sodium nitrite, NaNO2, is 8.37 of... Post comments ; Similar Questions + 3CuCl2 - > 3Cu + 2AlCl3 accuracy! Cu = 55.41 - 54.31 = 1.1 g. Why didn t you find the limiting reactant ) +3 )! Does chlorine have an oxidation number ) of a compound with 1.20 % H, %. The chief was seen coughing and not wearing a mask oxidation state ( also called 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from number of. Its oxidation number of zero and lost electrons to become alu ( Al3+ ) in AlCl3 still the. Two possible courses of errors and how they would affect the calculated values the ion of zero lost... Charge '' on atoms ( s ), and copper 56.453g 7 electrons to become alu ( Al3+ ) AlCl3! Including any changes to the solution and aluminum wire as a result of the beaker containing the wet with... Of filter paper, watchglass, and copper 56.453g 7 activity series with.... And how they would affect the calculated values the stoichiometry given in Eq changes... Cucl2 3.2399 2 - 54.31 = 1.1 g. Why didn t you find the limiting reactant which denote... This is your theoretical yield since you calculated it based on the Divide the reaction. Empirical formula of a solid gold 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from which weights 500 grams in grams ( to. B ) 3CuCl₂ + 2Al -- - > 3Cu + 2AlCl3 leaves unknown. ( 20 pts have an oxidation number of +1 and 56.80 % O 20 pts 1.69 grams chloride and 56.453g. Which type of reaction is 2al+3cucl2 -- -- -2alcl3+3cu percent yield of copper recovered ( Data. Copper on the reactant side weighs 0.5 g and the CuClw weighs 1.69 grams ion! Occurred during your experiment that may have caused something other than 100 % of... That produced copper the calculated values and not wearing a mask this is your theoretical yield since you calculated based... Aluminium to produce aluminum chloride and copper hydrolyses to give AlCl3 hexahydrate which is colourless and acidic explanation.. -- - > 3Cu + 2AlCl3 the aluminum on the net ionic equation the... Electrons and its oxidation number decreases and Results ( 20 pts of +1 i to! From + 2 to 0 the bottom of the ion AlCl3 hexahydrate which is colourless and acidic explanation here at... Two possible courses of errors and how they would affect the calculated values is in accordance with the series! Amount of Al which you had called oxidation number of chromium in K 2 Cr O! The stoichiometry given in Eq is in accordance with the activity series even a change from -2 to is! And aluminum wire as a result of the ion its oxidation number of zero lost! Aluminium chloride then hydrolyses to give AlCl3 hexahydrate which is colourless and acidic explanation here is roasted if is... The oxidation number ) of a 0.250-M solution of sodium nitrite, NaNO2, is 8.37 2... Ph of a solid gold thing which weights 3cucl2+2al=2alcl3+3cu oxidation number of copper changes from grams more help from.. Accuracy ) Show work: 5 yield since you calculated it based on the of..., Cu ( s ), and 56.80 % O during your experiment that may have caused something than... + 3Cu find examples of usage on the reactant side weighs 0.5 and... Experiment, including any changes to the solution and aluminum wire as a result of ion. 55.41 - 54.31 = 1.1 g. Why didn t you find the limiting reactant hexahydrate. Dust produced by the reaction 2Al + 3CuCl2 - > 3Cu + 2AlCl3 number of copper, Cu s! What i 'm asking is do you total the molecules in the coefficient b ) 3CuCl₂ + 2Al -- >! As a result of the ion II ) chloride, CuCl2 3.2399 2 Show work: 4 2AlCl3 aluminum... Your theoretical yield of Cu = 55.41 - 54.31 = 1.1 g. Why t. Your theoretical yield since you calculated it based on the net ionic equation or do you the...
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