4. Chemists can identify the composition of some unknown salts by conducting a flame test. When potassium salts are heated in a flame, a purple color is observed. This is due to the movement of electrons between energy levels. What is the electron configuration of a potassium atom at ground state? (A) 1s 2s 2p 3s?3p°4d! (B) 1s 2s 2p 3s²3p°3d (C) 1s2s 2d 3s23d 4s (D) 1s 2s 2p 3s23p$4s

4. Chemists can identify the composition of some unknown salts by conducting a flame test. When potassium salts are heated in a flame, a purple color is observed. This is due to the movement of electrons between energy levels. What is the electron configuration of a potassium atom at ground state? (A) 1s 2s 2p 3s?3p°4d! (B) 1s 2s 2p 3s²3p°3d (C) 1s2s 2d 3s23d 4s (D) 1s 2s 2p 3s23p$4s

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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7. Transition elements come from the d block. Examples of d block elements are manganese, cobalt, iron, copper, scandium and zinc. (a) Write the electron configurations for the atoms and ions of manganese and cobalt below. Mn atom: 1s? Co2* ion: 1s? (b) When iron is added to copper (II) sulfate solution, the iron displaces the copper ions from solution. However, when copper is added to iron (II) sulfate solution, the iron ions are not displaced and they remain in solution. (i) Write the half equation for the reduction of copper (II) ions to form copper. (ii) Explain why the reaction takes place only if iron is added to copper (II) sulfate solution.
Calculate the energy changes when the electron transitions from the n=1 to the n=4 state for the following ions Part (a) Singly ionized helium, He+. Part (b) Doubly ionized lithium, Li++. Part (c) Triply ionized beryllium, Be+++.
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3. A student was asked to write the electron configuration for a number of elements on an exam. Here is a sample of some of their answers: a) Ne s2 b) 1s²25³ c) [Kr] 4s1 Select any 2 of the answers above, and explain what is wrong. What element do you think they were describing? Write the correct electron configuration for that element.
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6) (a) The solubility of carbon tetrachloride (CCI4) in water at 25°C is 1.2 g/L. The solubility of chloroform (CHCI3) at the same temperature is 10.1g/L. Why is chloroform almost 10 times more soluble in water than is carbon tetrachloride? (b) Explain the difference between the Bohr model for the hydrogen atom and the quantum-mechanical model. Is the Bohr model consistent with Heisenberg's uncertainty principle? (Ctrl)
1- Arrange the following elements according to the given criteria Li , Na, K according to increasing atomic size Be, Mg, Ca according to increasing ionization energy. C, N, O according to increasing atomic size Li, Be, B according to increasing electron affinity. N, O, F according to increasing ionization energy.
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