(a)
Interpretation: The difference in the reactivity of
Concept Introduction:
Metals make the 75 % part of the periodic table. Metals are electropositive elements and mainly form ionic compound whereas non-metals are electronegative elements and can form either covalent or ionic compounds.
Halogens are most electronegative non-metals which are placed in the group-7 A. Due to more electronegative nature, they mainly forms ionic or covalent compounds with metals. These compounds are called as halides.
(b)
Interpretation: The reason of permanent darkness in the photo gray lenses needs to be explained.
Concept Introduction:
Metals make the 75 % part of the periodic table. Metals are electropositive elements and mainly form ionic compound whereas non-metals are electronegative elements and can form either covalent or ionic compounds.
Halogens are most electronegative non-metals which are placed in the group-7 A. Due to more electronegative nature, they mainly forms ionic or covalent compounds with metals. These compounds are called as halides.
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Chemical Principles
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- The amount of sodium hypochlorite in a bleach solution can be determined by using a given volume of bleach to oxidize excess iodide ion to iodine; ClO- is reduced to Cl-. The amount of iodine produced by the redox reaction is determined by titration with sodium thiosulfate, Na2S2O3; I2 is reduced to I-. The sodium thiosulfate is oxidized to sodium tetrathionate, Na2S4O6. In this analysis, potassium iodide was added in excess to 5.00 mL of bleach (d=1.00g/cm3) . If 25.00 mL of 0.0700 M Na2S2O3 was required to reduce all the iodine produced by the bleach back to iodide, what is the mass percent of NaClO in the bleach?arrow_forwardTungsten is usually produced by the reduction of WO3 with hydrogen: WO3(s)+3H2(g)W(s)+3H2O(g) Consider the following data: WO3(s) H2O(g) Hf(kJ/mol) 839.9 241.8 Gf(kJ/mol) 7631 228.6 a It K 1 or 1 at 25C? Explain your answer. b What is the value of S at 25C? c What is the temperature at which G equals zero for this reaction at 1 atm pressure? d What is the driving force of this reaction?arrow_forwardAn aqueous solution of an unknown salt of vanadium is electrolyzed by a current of 2.50 amps for 1.90 hours. The electroplating is carried out with an efficiency of 95.0%, resulting in a deposit of 2.850 g of vanadium. a How many faradays are required to deposit the vanadium? b What is the charge on the vanadium ions (based on your calculations)?arrow_forward
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