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