4.1. Electrolysis
A subsection of Chemistry, 5070, through 4. Electrochemistry
Listing 10 of 218 questions
Copper is a transition element. State two properties that are typical of the compounds of a transition element. Aqueous copper(sulfate reacts with aqueous potassium iodide. The ionic equation for this reaction is shown. 2Cu2++ 4I−2CuI+ I2Explain how this equation shows that the reaction involves oxidation. Anhydrous copper(sulfate decomposes when heated strongly. CuSO4CuO+ SO3A sample of 6.40 g of CuSO4 is heated until all of the sample has thermally decomposed. Calculate the volume of sulfur trioxide formed, in dm3, measured at room temperature and pressure. volume of sulfur trioxide dm3 Iron reacts with aqueous copper(sulfate to make aqueous iron(sulfate and copper. Construct the ionic equation for this reaction. Suggest one observation that would be seen during this reaction. Describe a chemical test that can be used to distinguish between aqueous solutions of iron(sulfate and copper(sulfate. chemical test result with iron(sulfate result with copper(sulfate
5070_s20_qp_22
THEORY
2020
Paper 2, Variant 2
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Copper(chloride, copper(iodide and copper(carbonate are ionic compounds. Predict two physical properties, other than electrical conductivity, of copper(chloride. 1. 2. Copper is a transition element. Suggest one property of copper(chloride that is characteristic of a compound of a transition element. Copper reacts with chlorine to make copper(chloride. Cu + Cl 2 CuCl 2 Copper(chloride contains Cu2+ and Cl – ions. Explain, in terms of the movement of electrons, how CuCl 2 is formed from copper atoms and chlorine molecules. Copper(iodide decomposes to make iodine and copper(iodide. The ionic equation for this reaction is shown. 2Cu2+ + 4I– 2CuI + I2 Use the information to explain that oxidation takes place. Use the information to explain that reduction takes place. A sample of copper(carbonate is heated strongly. Name the products of this reaction.
5070_s21_qp_21
THEORY
2021
Paper 2, Variant 1
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Questions Discovered
218