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Questions in chemistry

📝 Answered - You would expect a phosphorus-chlorine bond to be: 1. Nonpolar, with neither end having a partial charge. 2. Polar, with neither end having a partial charge. 3. Nonpolar, with the chlorine end having a partial negative charge. 4. Polar, with the chlorine end having a partial negative charge. 5. Nonpolar, with the phosphorus end having a partial negative charge. 6. Polar, with the phosphorus end having a partial negative charge. Explain why, please.

📝 Answered - A solution of hydrogen peroxide, \(\text{H}_2\text{O}_2\), is titrated with potassium permanganate, \(\text{KMnO}_4\), according to the following equation: \[5\text{H}_2\text{O}_2 + 2\text{KMnO}_4 + 3\text{H}_2\text{SO}_4 \rightarrow 5\text{O}_2 + 2\text{MnSO}_4 + 8\text{H}_2\text{O} + \text{K}_2\text{SO}_4\] It requires 46.0 mL of 0.145 Mol/L \(\text{KMnO}_4\) to titrate 50.0 mL of the solution of \(\text{H}_2\text{O}_2\). What is the mole per liter concentration of \(\text{H}_2\text{O}_2\) in the solution?

📝 Answered - Name a metal that doesn't conduct electricity.

📝 Answered - When \(\text{MgCO}_3(s)\) is strongly heated, it produces solid \(\text{MgO}\) as gaseous \(\text{CO}_2\) is driven off. Does the oxidation number of carbon change upon the formation of \(\text{CO}_2\)?

📝 Answered - What is the gram-formula mass of [tex]$\text{Fe(NO}_3)_3$[/tex]? 1. 146 g/mol 2. 194 g/mol 3. 214 g/mol 4. 242 g/mol

📝 Answered - One beneficial use of radioisotopes is: 1. Detection of disease 2. Neutralization of an acid spill 3. Decreasing the dissolved \(O_2(g)\) level in seawater 4. Increasing the concentration of \(CO_2(g)\) in the atmosphere

📝 Answered - Compared to the charge of a proton, the charge of an electron has: (1) a greater magnitude and the same sign (2) a greater magnitude and the opposite sign (3) the same magnitude and the same sign (4) the same magnitude and the opposite sign

📝 Answered - Two forms of solid carbon, diamond and graphite, differ in their physical properties due to the differences in their 1. atomic numbers 2. crystal structures 3. isotopic abundances 4. percent compositions

📝 Answered - Which change results in the formation of different substances? 1. Burning of propane 2. Melting of NaCl (s) 3. Deposition of CO2(g) 4. Solidification of water

📝 Answered - Which atom has the largest atomic radius? A. potassium B. rubidium C. francium D. cesium