Solution for CuO + H2 ⇌ Cu + H2O CO2 + H2 ⇌ 2CO + H2O H2 + F2 ⇌ 2 HF Fe + O2 ⇌ Fe2O3 NaOH + HCl NaCl + H2O An important feature of oxidation-reduction reactions can be recognized by examining what happens to the copper in this pair of reactions. If the mass of pure copper isolated was 7.214g, determine the percent by mass of CuO in the original sample. naresh v. Lv 6. The more positive the value of EV, the greater is the tendency of the species to get reduced. Copper oxide is oxidising agent-----Hydrogen is reducing agent . Effect of hydrogen pressure and sample's density on combustion parameters. Relevance. which is oxidised is the reducing agent and the sub. Heat ZnO+C----->Zn+Co Here, Zinc Oxide is reduced to become Zinc. Find an answer to your question “14 Copper (II) oxide reacts with hydrogen. What substance has it been reduced to? Name the element ‘X’ and the black coloured compound formed. No. CuO + H2 --> Cu + H2O. Q9 Name the substance oxidized, reduced, oxidizing agent and reducing agent in the following reactions :? (i) CuO + H2 ⎯→ Cu + H2O (ii) FeO + 3CO ⎯→ 2Fe + 3CO23 2 (iii) 2K + F⎯→ 2KF2 (iv) BaCl2 + H2SO4 ⎯→ BaSO4 + 2HCl 2. oxidising agent reducing agent A H2 Cuo B Cuo H2 с H2O Cu D Cu H20. Many know me as the Ten Year Series book author for JC A-Level H2 Chemistry and O-Level Pure Chemistry. b) Fe2 O3 + CO -----> 2Fe +3 CO2. Answer: When 6 molecules of … Reason(R): Cu is a less reactive metal. h2 to oxidised to form h2o . So, cupric oxide is reduced to copper and hydrogen is oxidized to water. (gains electrons) What species gained electrons in this equation? a) MnO2 +4HCl-----> MnCl2 + Cl2 + 2H2 O . 9 years ago. asked Jun 8, 2018 in Chemistry by rubby ( 51.7k points) Time-resolved X-ray diffraction, X-ray absorption fine structure, and first-principles density functional calculations were used to investigate the reaction of CuO and Cu2O with H2 in detail. Remember the mnemonic "oil rig": oxidation is loss, reduction is gain. Using the standard electrode potential of redox couples given below to find out which of the following is the strongest oxidising agent. H2 + Cl2 → 2 HCl In this reaction, addition of hydrogen takes place to chlorine. Favourite answer. Answer: CaCO 3 → CaO + CO 2 CaO is a solid and carbon dioxide is a gas. XRD patterns of initial copper oxide—central part of sample (a), intermediate layer between the initial CuO and the reduced copper (b) and the reduced copper (c). When sodium hydroxide reacts with hydrochloric acid, it gives sodium chloride and water. When gaseous hydrogen and chlorine are heated together, hydrogen chlo- ride gas is formed. After the reaction, the valency of copper is 0, the valency of hydrogen is + 1 and the valency of oxygen remains - 2. CuO + H2→ Cu + H2O (ii) Fe2O3 + 3CO → 2Fe + 3CO2 (iii) 2K + F2→ 2KF (iv) BaCl2 + H2SO4→ BaSO4 + 2HCl Solution: Option (iv) is the answer. We can also define oxidation as the addition of oxygen or removal of hydrogen to a substance, while reduction is the removal of oxygen or addition of hydrogen to a substance. 2. In this reaction, sodium … substance oxidized:Al since Al gained O substance reduced: O 2 ; substance oxidized:H 2 since it gained O substance reduced: H 2 O 2 since it lost O; substance oxidized:CH 3 OH since it lost H (and gained O) substance reduced: O 2 since it gained H . Fe2O3+3Mg=2Fe+3MgO. Let x = grams of CuO in the original sample. 17. 0. 3.2. (Express your answer as a chemical formula.) 6 years ago. 2A1+ 3Cl2 + 2AlCl3 is oxidized. One. Reducing agent • A substance that causes reduction in another substance. The substance losing electrons is being oxidized and the one gaining electrons is being reduced. In the Reaction Represented by the Following Equation: Cuo (S) + H2 (G) → Cu (S) + H2o (1) (A) Name the Substance Oxidised (B) Name the Substance Reduced (C) Name the Oxidising Agent (D) Name the Reducing Agent Concept: Types of Chemical Reactions - Oxidation and Reduction. HCl is … What substance has it been reduced to? How are charges written vs oxidation #s? CuO(s) + H2(g) → Cu(s) + H2O(l)? Oxygen is getting removed from water (H2O) hence it is getting reduced. Answer: B CuO H2 Explanation: hydrogen will oxidized to form water. … Comment; Complaint; Link; Know the Answer? is reduced. The more positive the value of Eᶱ, the greater is the tendency of the species to get reduced. Oxidizing. Which substance is reduced in this reaction? A. CuO And H2B. CuO + H2 Cu + HzO. (a) ZnO + H2 Zn + H2O (b) CO2 + 2Mg 2MgO + C (c) Mg + H2O MgO + H2 (d) Fe2O3 + 3CO 2Fe + 3CO2 (e) H2 + Cl2 2HCl (f) CuO + Mg Cu + MgO (g) FeS + 2HCl FeCl2 + H2S Solution Chapter 11 Redox Reactions 2 Answers. Ask Question + 100. d. 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO+ 4H20 is oxidized. always remember the sub. Cu2+ is the oxidising agent. What is the point of oxidation and reduction/why do they exist? cuo is reduced to cu . Question 1: What happens when carbon dioxide and water react in the same ratio? Examples: a) C + O2 ---> CO2 (oxidation) b) CuO + H2 ---> Cu + H2O (reduction) From the above examples, carbon undergoes oxidation to carbon(IV)oxide in (a) because oxygen was added to it. Give a reason for your answer. [CBSE 2013] 3.3 Classify the following chemical reactions as exothermic or endothermic: (i) Water is added to quick lime. 2 Cu + O2 → 2 CuO ; CuO + H2 → Cu + H2O If hydrogen gas is passed over this heated material (CuO ) the black coating of the surface turns brown as the reverse reaction takes place and copper is obtained. 0 5. 4 Answers. In the case of this reaction, The valency of copper before this reaction is + 2, the valency of oxygen is - 2 and valency of hydrogen is 0. Chemical Reaction and Catalyst Short Answer Type Questions. Charges are written w/ sign placed after # (2+) & oxidation #s are written so that sign of # = placed before # (+2). is reduced. 2 H2S(g) + O2 (g) → 2 S (s) + 2 H2O (l) (8.4) As knowledge of chemists grew, it was natural to extend the term oxidation for reactions similar to (8.1 to 8.4), which do not involve oxygen but other electronegative elements. which is reduced is the oxidising agent. NaOH + HCl → NaCl + H2O. The substance reduced is the _____ agent. • • • • • • • Oxidation is loss of electrons; Reduction is gain of electrons CuO + H2 Cu + H2O CuO Cu+2 and O-2 Cu+2 Cu [gains 2 electrons] reduced H2 H2+2[loses 2 electrons] oxidised O-2 O-2 [ no change] 10. c) 3MnO2 + 4Al -----> 3Mn +2 Al2O3. CuO And CuD. CuO + H2 → Cu + H2O. (ii) 3MnO2 + 4Al → 3Mn + 2Al2O3. Thus, H 2 is the reducing agent in this reaction, and CuO acts as an oxidizing agent. State which substance is reduced. Ray;mond. 9. [If you write those things as I have mentioned above you will get 5 marks] Source(s): I wrote this answer for my exam and got 5 marks . CuO was … Get your answers by asking now. c. Cu + 4HNO3 → Cu(NO3)2 + 2NO2 + 2H20 is oxidized. CuO + H2 → Cu + H2O Which row is correct? Lv 7. +2 to 0. Identify which substance is oxidized and which substance is reduced in each of the following redox reactions. False. is reduced. Eq. The removal of O from a substance (CuO + H2 => Cu + H2O). A reducing agent is oxidised in redox, and an oxidising agent is reduced. Answers (1) Nidawi 17 October, 02:25. 0 0. H2 And CuOC. Water is providing oxygen to Iron and that’s why it is acting as an Oxidising Agent. Relevance. None Of These Choices Is Correct. 2. 3.2 Name the substance oxidised and reduced, and also identify the oxidising agents and reducing agents in the following reactions: (i) Fe2O3 + 3Co → 2Fe + 3CO2. My 19+ years of coaching experience (since 1999) with more than 1500 students from 180+ JCs and Secondary Schools has allowed me to understand the true reasons why students are not able to perform well in Chemistry. Which substance is reduced in this redox reaction? Fe2O3. CuO+H2-----Cu+H2O. The oxidizing agent is reduced. Electrolysis is a process that cause a _____ redox reaction to occur. Which of the following are exothermic processes? In an acid base reaction water is one of the end products. Lv 7. The following illustration is another reaction where removal of hydrogen can also be cited as an oxidation reaction. non-spontaneous. In this reaction, oxygen is removed from copper and oxygen is added to hydrogen. Identify the oxidizing and reducing agent in each reaction below. It is the reducing agent. The mechanism for the reduction of CuO is complex, involving an induction period and the embedding of H into the bulk of the oxide. Cu in CuO lost 2 electrons when converted to Cu(s). Join Yahoo Answers and get 100 points today. Question 23: Give one example of decomposition (RBSESolutions.com) reaction in which solid and gas are two products obtained. Answer Save. D. O. Reason(R): Cu is a less reactive metal. 4. Consider The Reaction CuO(s) +H2(g) >> Cu(s) +H2O(l). It has lost electrons, so it is oxidised. consider the chemical equation given below and answer the questions that follow: CUO + H2 ----- on heat CU +H20 a)Name the substancewhich is getting oxidized b)Name the substance which is getting reduced c)Name the oxidizing agent d)Name the reducting agent e)what type of - Science - Chemical Reactions and Equations a. Ans:- It has gained electrons, so it is reduced. C. H20. CuO+H2=Cu+H2O. True or False: The corrosion of iron requires … CuO+H2----->Cu+H2O. B. Cu, but it's the Cu in CuO, not Cu(s) 5 0. B. Cu. y = grams of Cu2O in the original sample. Still have questions? H20 gained electrons. a) MnO2 is oxidant and is reduced to MnCl2. CuO(s) + H2(g) → Cu(s) + H2O (l) In the course of this reaction, CuO is reduced to copper metal. A shiny brown-coloured element ‘X’ on heating in air becomes black in colour. 6 years ago. Simonizer1218. A mixture of Cu2 and CuO of mass 8.828g is reduced to copper metal with hydrogen: Cu2O + H2 --> 2Cu + H2O. Source(s): https ... (+2)(-2)..(0) -->(0)..(+1)(-2) Oxidizing agent = a substance that gains electrons in a redox chemical reaction. b. CuO+H2 → Cu +H2O is oxidized. is reduced. Are all chemical reactions oxidation reduction reactions? (a) ZnO + H2 Zn + H2O (b) CO2 + 2Mg 2MgO + C (c) Mg + H2O MgO + H2 (d) Fe2O3 + 3CO 2Fe + 3CO2 (e) H2 + Cl2 2HCl (f) CuO + Mg Cu + MgO (g) FeS + 2HCl FeCl2 + H2S Solution Chapter 11 Redox Reactions 12. H2O And H2E. Here, H = reducing agent & copper(II) oxide =reduced substance. 2. … State which substance is reduced. The substance which acts as an oxidising agent itself gets reduced and the substance acting as reducing agent itself gets oxidised. Answer. from a substance. Not Sure About the Answer? Reduction occurs when a chemical specie gains electrons or its valence number is reduced. In This Reaction, Which Substances Arethe Oxidizing Agent And Reducing Agent, Respectively? Cupric oxide is oxidizing agent and hydrogen is reducing agent. and. Answer Save. Click hereto get an answer to your question ️ Identify the substances that are oxidized and the substances that are reduced in the following reactions. Here, Copper Oxide is reduced to become Copper. 2. d) 2PbO +C -----> 2Pb +CO. H2 .. it went form an O.S of 0 to +1. It was reduced. (iii) H2S + SO2 → S + H2O. Cuo H2 Cu H2o. in this reaction the reducing agent is h2 and the oxidising agent is cuo . Assertion: (A) CuO + H2 → Cu + H2O is a redox reaction . Cu goes from ON. Which substance is reduced in the reaction? Give a reason for your answer. A. H2. Fe goes from oxidation number 0 to +2. 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