How many protons, electrons, and neutrons are present in the following ? Magnesium cation (Mg2+), Chloride anion (Cl-), Carbon -14(14C), and Tritium (3H)?
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How many protons, electrons, and neutrons are present in the following ?
Magnesium cation (Mg2+), Chloride anion (Cl-),
Carbon -14(14C), and Tritium (3H)?
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- (i) MnO is basic whereas Mn207 is acidic in nature. Why? (ii) Transition metals form alloys. Why? (iii) Complete the following equation: 2MnO4 + 4KOH + O2 ———>Iodine has 37 known isotopes. Therefore, the atomic mass has a range of 108-144 amu. Which of the following statements concerning iodine is correct? A) The isotopes of iodine have between 55 and 91 protons. B) An atom of iodine can have between 55 and 91 neutrons. C) The isotopes of iodine will always have the same number of neutrons, but the protons can vary. D) The isotopes of iodine have between 108 and 144 neutrons, but the number of protons will not vary.Solid iron(II) fluoride (FeF2, Ksp= 2.36 x 10-6) is dissolved in water. If 8.1 x 10-3 mol L-1 of iron(II) ion is found to be in solution. Is the solution saturated, unsaturated, desaturated or supersaturated.
- Nitrogen reacts with powdered aluminum according to the reaction:2 Al(s) + N2( g) → 2 AlN(s)How many liters of N2 gas, measured at 892 torr and 95 °C,are required to completely react with 18.5 g of Al?Look up the valence electron configuration, covalent atomic radius, effective nuclear charge, first ionization energy and Pauling electronegativity in Chapter 8 (tables are attached). Examine the above data and answer the following questions. a) Explain why some of the elements like TI and Pb on the lower left of the p block are metallic. b) Explain why some of the elements like C, Si in the center of the p block form covalent bonds. Explain why these bonds formed by the network of these elements (as studied in Chapter 25) tend to be unreactive. c) Explain why the noble Group 8A elements are highly unreactive gases. d) Explain why some elements like F, CI, Br etc, on the upper right of the p block are highly reactive nonmetals.Ferrous sulfate is one dietary supplement used to treat iron-deficiency anemia. What are the molecular formula and molecular mass of this compound? howmany milligrams of iron are in 250 mg of ferrous sulfate?
- According to chemist John Dalton, if one mole of nitrogen is combined with three moles of hydrogen to form one mole of ammonia (knowing that nitrogen, with an atomic number of 7, has an atomic mass of 14, and hydrogen, with an atomic number of 1, has an atomic mass of 1), then this compound will have an atomic weight (or molecular mass) of: 14 grams per mole (14 daltons) 17 grams per mole (17 daltons) 20 grams per mole (20 daltons) 22 grams per mole (22 daltons) 43 grams per mole (43 daltons)Apply the formula for the differences in electronegativities, for the following molecules, and define whether they are polar covalent, nonpolar covalent or ionic. Taking into account that: Non-polar covalent: greater than or equal to 0 but less than 0.7 Polar covalent: greater than or equal to 0.7 but less than 1.7 ionic: greater than 1.7 A)NO B)KCI C)F2 C)AsOArrange the elements Na, Si, and S in the order of(a) decreasing atomic radius.(h)increasing first ionization energy.
- How many grams of glucose (C6H2O6 molecular mass =180daltons) would be present in one liter of a 1M (molar) solution of glucose?Balance the following (fictional) chemical equations by supplying the correct coefficient. Do not leave any space blank (in other words, write in 1 if you would be leaving it blank): R(OZ)2 - RY2+ Z20 a) ZY+ b) D2 (g) + L2 (g) – DL3 (e)In which of the following pairs is the first element expected to have a higher electronegativity than the second? (1 Point) O O, P O Cs, Rb O I, Br Al, P