1345 0 obj
<>
endobj
Even without knowing the exact mechanics of the reactions given in the answer choices, we know that we are looking for a reaction in which multiple molecules combine to form a single molecule. In lab, we were investigating a cycle of copper reactions, however similar reactions occur with other elements. Solution for The cycle of copper reactions illustrates important principles of chemical reactions. A vigorous displacement reaction occurs and the solution gets very hot, aluminium dissolves and red copperis visible. Lab Report #3: Copper Cycle Abstract: The purpose of the experiment is to cycle solid copper through a series of five reactions. Remind students what copper looks like, so that they know what they are looking for. Weight of SO3 is 61.5 g. Copper also forms an important series of alloys with aluminum, called aluminum bronzes. In other words, to recover the same amount of copper metal that you started with, this will require careful work. Copper oxide dissolves in acid, regenerating the copper (II) ion, which once again binds to water.CuO (s) + 2 H 3 O + (aq) + 3 H 2 O (l) --> [Cu(H 2 O) 6] 2+ (aq) Finally, zinc metal reduces the hydrated copper (II) ion back to metallic copper while itself turning being oxidized to zinc (II) ions. She Added A Piece Of Copper Metal To The Flask, And Found The New Mass To Be 22.802 G, From Experimental Procedure - Part E 32. INTRODUCTION The purpose of this experiment was to cycle copper through five different reactions. The sequence begins and ends with copper metal, so it is called a cycle of copper reactions. Follow all directions carefully!! In the sequence the available starting materials change in a number of steps. What percentage of the copper did you recover? A: Step 1: Hello. Don't use plagiarized sources. Chemistry 11 Copper Cycle Stoichiometry Assignment 1) Consider the reaction below, which is the first step in the process of recycling copper. Question: THE COPPER CYCLE: A Series Of Reactions Pre-Lab Questions 1. The amount of copper recovered at the end of the four-reaction cycle provides a good test of laboratory technique and efficiency. The final washing removes the soluble ZnSO4. Cu(s) CuC12(aq) 3. Observations will be made for each reaction. Unit of molarity is M or mol/L. Observations will be made for each reaction. This cycle of reactions i s: 4 HNO 3(aq) + Cu (s) → Cu(NO 3) 2(aq) + 2 H 2O (l) + 2NO 2(g) (1) Cu(NO 3) 2(aq) + 2NaOH (aq) → Cu(OH) 2(s) + 2NaNO 3(aq) (2) Cu(OH) 2(s) → CuO (s) + H 2O (l) (3) CuO (s) + H 2SO 4(aq) → CuSO 4(aq) + H 2O (l) (4) CuSO 4(aq) + Zn (s) → ZnSO 4(aq) + Cu (s) (5) You should recognize several different types of reactions in this cycle. A: The most important contributor is the resonating structure with the highest stability. First reaction involves reaction between the copper and nitric acid, and copper changed from elemental state to an aqueous. Let me know what you think of the lab in the comments.DISCLAIMER:This experiment must be performed outside or in a fume hood. The cycle of reactions to be performed is shown in Figure 1. ��i�"y<> E�<4k���l �k� �lwk�}�Gʖ�����'ޏwgC��V��V�ie���U�9i��.9c���h���L�r3�,����%��E+@�6���e4Xe������r�r��Xِd��a;iE After all of the chemical reactions have finished, the final mass of copper was 6.85 grams. Second - the maximum possible yield (note correct spelling) is 100%, which. In total, you will perform five reactions involving copper, starting with the oxidationof copper metal to copper ion and ending with the reductionof copper ion to … The last reaction returns the copper to its original metallic form which you will recover and weigh. I had to apply heat during the first reaction of the copper wire with HNO3 because some of the wire still remained. Start studying CHEM 1212: Exp. Then sodium chloride is added and dissolved. I2 is produced by the reaction of 0.4235 mol of CuCl2 according to the following equation: 2CuCl... A: The balanced reaction taking place is given as, Suppose you start with 0.493 g of Cu. Cu(s) + 4HNO3(aq)! View Lab Report - Copper Cycle Pre-Lab from CHEM 110 at McGill University. c. Apparatus and Chemicals 0.5 g piece of no. Reaction 1 is a redox reaction because it involves oxidation of Cu solid to Cu (II) ion and reduction of the nitrate ion to gaseous nitrogen dioxide. 0��2A�p �!�������:�;*�0������2ˤw4P+���� \Hs�����dR�7mue:���`,�ku����Η"����l(��i�h� ���`���Do��/ �~��
Note: The following reactions involved in the Copper Cycle are in random order. h�b```���� cb� +[��6������AɃ���(+��dYc_��a ��T��(���`�x��JAb�,��{2����
��0�H�h_�V�6�zZ�Kny�h�H��.oE�q Lt�h� z�*��� ���)�3uZ-\6���4˯�:(t"(�n2�S՝�)=)_w��Ls6���UX�f��I�1�GtH1[��G�ԕ���1H�6�����@���������� Copper(I) ions in solution disproportionate to give copper(II) ions and a precipitate of copper. Cycle B starts with a solution of copper (II) chloride, which is used to precipitate basic copper carbonate. As the reaction progresses and [Cu +] decreases in the copper half-cell, positively charged sodium ions are transferred in to keep the charge balanced within the half-cell. Si Ming (Andrew) Xu (260731351) CHEM 110 - 003 9/13/2016 Pre-Lab Questions: … When this compound is heated, it is transformed to copper (II) oxide, CuO. At different stages of the cycle, copper was present in different forms. Copper Cycle. November 3rd, 2009 Lab Report #3: Copper Cycle Abstract: The purpose of the experiment is to cycle solid copper through a series of five reactions.At different stages of the cycle, copper was present in different forms. Ca(C2H3O2)2(aq) + Na:CO:(aq) – CaCOs(s)'+ Na... Q: . Suppose you start with 0.514 g of Cu. • With careful attention to quantitative lab practices, you should be able to recover all the copper you started with. The Copper Cycle In this experiment, you will carry out a series of reactions to transform copper into various forms and learn more about the three main types of chemical reactions: precipitation, acid-base neutralization, and Figure 1. Stoichiometry: The Reaction of Iron with Copper(II) Sulfate Purpose:!To!enhance!the!understanding!of!stoichiometry,!a!reaction!between! The copper first underwent a redox reaction with nitric Explanation: A The electron transfer does not happen across the salt bridge, eliminating options (C) and (D). Draw the mechanism for the following early step in the biosynthesis of the molecule widely used f... A: Given: The last reaction returns the copper to its original metallic form which you will recover and … After performing all the reactions, you have 0.466 g of Cu. How to do the percent yield of copper lab from a reaction of cupric sulfate and iron as performed at Ranburne High School. A Cycle of Copper Reaction. ii. The cycle of copper reactions starts with solid copper metal and ends with solid copper metal. NOTE: You must wear goggles and aprons throughout this experiment!! sample through a series of five reactions • The end product will be your original copper sample, making this a cycle of reactions. It is found in nature as the mineral chalcocite. Explanation: An anabolic reaction is one in which larger molecules are made from combining smaller molecules. First - the reaction of copper with (concentrated) nitric acid is exothermic. The atomic theory predicts this behavior. When copper (II) sulfate and aluminum are allowed to react, aluminum sulfate and copper are formed. What percentage of the copper did you recover? Copper metal is successively treated with nitric acid, sodium hydroxide, heat, sulfuric acid, and magnesium in a cycle of chemical reactions to regenerate the copper metal. Find answers to questions asked by student like you. This allows reaction with the copper(II) sulfate. Cu(s)→ Cu2+(aq)+2e− C u ( s) → C u 2 + ( a q) + 2 e −. First reaction involves reaction between the copper and nitric acid, and copper changed from elemental state to … View Lab Report - Copper Cycle Pre-Lab from CHEM 110 at McGill University. I hope you enjoy this video! Write the balanced chemical equation for this reaction. copper reactions. 1380 0 obj
<>stream
Answer: sunlight 2AgBr(s) -----> 2Ag (s) + Br 2 (g) (Silver Bromide) Q13: Why does copper vessel acquire green coating in rainy season? Transfer the balanced equations from the Procedure and circle the classification of each cquation Part A: Dissolution of Copper Balanced Equation Synthesis Decomposition Complete Oxidation Single Displacement Doble Displacement Part B: Formation of Copperill) hydroside Balanced Equation: Symthesis Decomposition Complete Oxidation Single Displacement Deuble Displacement Part C: Preparation of Copper (il) oside Balanced … Copper(I) sulfide is a copper sulfide, a chemical compound of copper and sulfur. Reaction Specific Guidelines for Reaction ; Cu(s) + HNO 3 (aq) → This reaction must be performed in the back of a fume hood. The Copper Cycle Most of the background material for this laboratory will be covered in greater detail in the lecture course later in the semester. In this experiment you will study a stepwise sequence of 2. 1.9) Two test tubes are taken and labeled A and B. It is then converted to copper (II) hydroxide, Cu(OH) 2. , by reaction with base. 2. a. %%EOF
A Student Weighed A 25-ml Erlenmeyer Flask And Found It To Be 22.683 G. 2. Here is some background information so you will understand the chemistry behind the reactions you will perform. Thus, the same number of moles of copper was produced in the final reaction because the amount of copper remained constant throughout the experiment. The gases (and their smells) commonly formed in chemical reactions are H2S (rotten egg), SO2 (burnt match), CO2 (odorless, doesn’t support combustion), O2 (odorless, supports combustion), H2 (odorless, explosive), and NH3 (ammonia). Learn vocabulary, terms, and more with flashcards, games, and other study tools. 2. Answers: 1. Aluminium appears less reactive than copper. CYCLE OF COPPER REACTIONS. Reaction Specific Guidelines for Reaction ; Cu(s) + HNO 3 (aq) → This reaction must be performed in the back of a fume hood. Cu(s) CuC12(aq) 3. Type The Balanced Equations From The Procedure, And Classify Each Reaction As Synthesis, Decomposition, Complete Oxidation, Single Displacement Or Double Displacement. 2- Classifying Reactions in the Copper Cycle. The Copper Cycle Alexes Montalvo Chem 1500-10 September 26, 2012 The Copper Cycle Introduction: The Copper Cycle is a popular experiment used to determine if an element, in this instance, copper, reverts to its elemental form after a chain of reactions.This experiment is very dangerous because of the reactions between the strong acids and bases. Two iron nails that were cleaned by rubbing with sand paper were immersed into test tube B and left undisturbed for 20 min. h�bbd```b``�"�d1�d[ "��A${>�d���A�@�)���$�� bo����3012�^ �M �?ß
o Gy? Median response time is 34 minutes and may be longer for new subjects. THE COPPER CYCLE: A Series of Reactions . Redox couples are written "ox/red". ... Our answers are of high quality from professionals and will give you insight to understand your class concepts effectively. Dݤ'�&�;puzv����g �f��lM$�T�=�*����;+��2����b.�8iX��"�c��b����$�O��`q�A�Ǯ.b�ޓQ�R��`��J�Ȍp�A�U������Q^�"��AiL��3�)��);"�8H�5zI�F�w�H����g��%8(J8*�Zʙ9Mpb�� �6�sQ�'([ۣL����(�6�s���rV�����C{�-���'��M�&�����C�������hCr
k��P��`�Q9��\C
��j���k �X�5�jl0uVc��6j_��&_����4�|H5 k�ߔ:P��Py�+Q�+2\j��5�k�AM�8 Place 4 pieces each of blue and red litmus papers o... A: pH scale - Oxidation reaction Q12: Give an example of decomposition reaction where energy is supplied in form of light. In the beaker with the solid copper is a dissolved solution of zinc sulfate. Copper is a part of many coinage metals. Copper Cycle Chemists in industry often use stepwise procedures involving a sequence of chemical reactions to obtain a desired product. Compare the intensity of the blue colour of copper sulphate solutions in test tubes (A) and (B). The original copper sample contained a specific number of moles of copper, and that amount of copper was present in every reaction, precipitate, and solution. The four-reaction copper cycle featured in this experiment is summarized below. The given reac... Q: Balance the following chemical equation (if necessary): Fill in the blanks to show the reagents that will be used in each step. This is a cycle of reactions, because you start and end with the same substance, copper metal. A Cycle of Copper Reactions In this experiment, you will begin with the element copper, and carry out a series of chemical transformations in which you will see copper in other forms. What percentage of the copper did you recover. Preparation of Cu (OH)2. Correct Answer: A. ����$��^��N��t�b2���w��x�I9m���Û����T>QuޖiG���b2�[@hu1�.OOg_�#��2��&V4y��辭���v������0�M��uﴮ.��Iw{2���JWo�Ѹ��)g�w�/E%������,���,C��w�ټ��Wײ>>��T�?"��i?�?b��9-Z�g�G����D�꺛�L�����/�g�F��! Thus, the same number of moles of copper was produced in the final reaction because the amount of copper remained constant throughout the experiment. We explored one such reaction in lecture when we combined zinc with nitric acid. [72] Experiment 6: The Reactions of a Copper Cycle PURPOSE AND LEARNING OBJECTIVES During the process of this experiment, you will observe and record the chemical and accompanying physical changes that occur when metallic copper is carried through a series of chemical reactions that produce a number of different copper compounds before the copper is restored to its original metallic state. Start studying CHEM 111: Experiment 3 - The Copper Cycle. The amount of copper recovered at the end of the four-reaction cycle provides a good test of laboratory technique and efficiency. Beryllium copper (2 percent Be) is an unusual copper alloy in that it can be hardened by heat treatment. Write a balanced equation for this reaction. Substance with pH < 7 are acids A Cycle of Copper Reaction. PreLab Assignment: Examine the above … A Cycle of Copper Reactions In this experiment, you will begin with the element copper, and carry out a series of chemical transformations in which you will see copper in other forms. 2. This is a good example of disproportionation - a reaction in which something oxidises and reduces itself. The balanced equation is: The cycle of copper reactions starts with solid copper metal and ends with solid copper metal. The cycle of copper reactions starts with solid copper metal and ends with solid copper metal. From this blue solution, you will precipitate copper(II) hydroxide. The sequence begins with copper metal and ends with copper metal, so it is called a cycle of copper reactions. The final step will be to add zinc to precipitate copper metal by single displacement. For the stabi... Q: 2. only happens if all the reactants go to form products. Answer: It reacts with CO 2 in the atmosphere and forms a layer of basic Copper Carbonate. The four-reaction copper cycle featured in this experiment is summarized below. This indicates that silver ion has a vacant orbital at lower energy than that in which two of copper's electrons reside. endstream
endobj
startxref
The cycle begins with elemental copper, which in a first… Chemical Reactions of Copper Experiment 9 9-3 d. A gas is formed upon mixing two compounds and/or solutions. Since the question contains multiple subparts, the first three subparts are solved. These masses differ quite tremendously. %PDF-1.5
%����
Substan... Q: How much heat, in joules, must be added to a 75.0 g block of a metal alloy with a specific heat of 0... A: Given, Copper Cycle Lab #13 In this lab you will have an opportunity to observe a number of different types of chemical reactions and to write and balance some chemical equations. PART A: 1. caitlin bettenay 25th october 2016 cycle of copper chemistry lab fall term october 2016 caitlin bettenay lecturer: bryce clifton caitlin bettenay 25th october That all depends on what the copper looked like at the beginning. The addition of sulfuric acid to the copper (II) oxide will produce copper (II) sulfate. What kind of reaction is this? In the first part of experiment, the copper (II) ion is used to make new compounds and complexes.The cycle of reactions is completed with the reaction where elemental copper was regenerated. ... That’s why it is better to give examples or explanations related with this property. Transfer the balanced equations from the Procedure and circle the classification of each cquation Part A: Dissolution of Copper Balanced Equation Synthesis Decomposition Complete Oxidation Single Displacement Doble Displacement Part B: Formation of Copperill) hydroside Balanced Equation: Symthesis Decomposition Complete Oxidation Single … Initial temperature, T1 = 25 oC b. endstream
endobj
1346 0 obj
<>/Metadata 116 0 R/Pages 1343 0 R/StructTreeRoot 150 0 R/Type/Catalog>>
endobj
1347 0 obj
<>/MediaBox[0 0 612 792]/Parent 1343 0 R/Resources<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>>
endobj
1348 0 obj
<>stream
If heat had been applied more frequently during the experiment I think it would have speeded up the reactions a bit more. Weight of H2SO4 is 56.6 g. Copper(I) chemistry is limited by a reaction which occurs involving simple copper(I) ions in solution. 0
2. The Copper Cycle Most of the background material for this laboratory will be covered in greater detail in the lecture course later in the semester. The success of the … The Copper Cycle In this experiment, you will carry out a series of reactions to transform copper into various forms and learn more about the three main types of chemical reactions: precipitation, acid-base neutralization, and The sequence begins with copper metal and ends with copper metal, so it is called a cycle of copper reactions. Also, my reactions seemed to take a very long time, particularly the reaction of the copper with zinc. 3. Cycle Of Copper Reactions Lab Report. After performing all the reactions, you have 0.466 g of Cu. You will begin the lab with a piece of copper wire, convert the copper into a number of different compounds of copper and finally recover the copper. 0.10 M of Cu (NO3)2 solution is reacted with 2 M NaOH solution to obtain Cu (OH)2 . Don't Worry About Typing Subscripts, If You Do Not Know How To Do Thot In Word. a) The copper was not completely dry. THE COPPER CYCLE: A Series of Reactions . The goal of this lab was to see if the mass of copper would be same after going through a series of chemical reactions. The cycle of copper reactions to be performed in this experiment. ABSTRACT The purpose of this experiment was to cycle copper through a series of different chemical forms by reacting the copper with different chemicals. Since no copper is added or removed between the initial and final reaction steps, copper can be quantitatively recovered. j��3���~�*�Ӆ�>~�Yʧ]�?���Z�cX���x�]Ҽa;�i�`���.�y� c�vX�a��y7�f-�
kA��Z�k���f0�_����َ�*�a-��~_N٧�ѷ��m/�ԃN��e��]z��Q�h�ɐ���z��a�S��"�[ah��wBĚ�x6-+ Sulfur when heated becomes red because of its phase transition (from solid to liquid), and later it reacts with copper in a pretty simple reaction:Cu + S --> CuS . 16 or no. c) There is some other source of metal, such as zinc or aluminum, used in one of the redox reactions and gets trapped in the copper … Hence, it does not have a starting or an ending point. This experiment illustrates the displacement of copper from copper(II) sulfate solution using aluminium foil. Get Your Custom Essay on The Copper Cycle Lab Report Just from $13,9/Page. The reaction … Since no copper is added or removed between the initial and final reaction steps, copper can be quantitatively recovered. The cycle of copper reactions starts with solid copper metal and ends with solid copper metal. The original copper sample contained a specific number of moles of copper, and that amount of copper was present in every reaction, precipitate, and solution. 3 CuSO 4 (aq) + 2 Al(s) Al 2 (SO 4) 3 (aq) + 3 Cu(s) This reaction is an example of a redox reaction: where aluminum is oxidized and copper is reduced. Students add aluminium cooking foil to copper(II) sulfate solution and observe no reaction. Chemistry 11 Copper Cycle Stoichiometry Assignment 1) Consider the reaction below, which is the first step in the process of recycling copper. 18 copper … Substances with pH > 7 are base or alkaline In redox reactions, the oxidized and reduced forms of each reactant are called a redox couple. Q: Identify the nucleophile and leaving group and draw the products of each substitution reaction. The percent recovery came out to be 17%. The solution gets warm while the reaction proceeds. About 10 ml of copper sulphate solution was added to both the test tube. Suppose you start with 0.493 g of Cu. After performing all the reactions, you have 0.466 g of Cu. Question: THE COPPER CYCLE: A Series Of Reactions Experimental Data From Experimental Procedure - Part A 1. Fill in the blanks to show the reagents that will be used in each step. Now aluminium is more reactive because it displaces copper. Learn vocabulary, terms, and more with flashcards, games, and other study tools. INTRODUCTION The purpose of this experiment was to cycle copper through five different reactions.