9.4. Reactivity series
A subsection of Chemistry, 0620, through 9. Metals
Listing 10 of 452 questions
GroupI elements, GroupVII elements and transition elements are found in different parts of the Periodic Table. Describe the trend in the reactivity of GroupI elements. When potassium is added to water a chemical reaction occurs. State two observations that can be made when potassium is added to water. Write a chemical equation for the reaction of potassium with water. Excess aqueous potassiumiodide is added to chlorine. Write a chemical equation for the reaction that occurs when aqueous potassiumiodide is added to chlorine. State the final colour of the reaction mixture. Sodium is extracted from sodiumchloride by electrolysis. State the meaning of the term electrolysis. State what must be done to sodiumchloride before it can be electrolysed to produce sodium. Write an ionic half-equation for the change that occurs at the cathode during this electrolysis. Chromium is a transition element. ● Chromium has a high melting point. ● Chromium is a good conductor of electricity. ● Many chromium compounds are soluble in water. ● Hydrated chromium(sulfate is green. ● Chromium forms the chlorides CrCl 2 and CrCl 3. ● Oxides of chromium act as catalysts in the manufacture of poly. Use this information to give two properties of chromium which are different from properties of GroupI elements such as sodium.  Use this information to give two properties of chromium which are similar to properties of GroupI elements such as sodium.  
0620_w20_qp_43
THEORY
2020
Paper 4, Variant 3
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Questions Discovered
452