Concept explainers
Interpretation: Give the name and
Concept introduction: Noble gases are group of elements with very low chemical reactivity. The six noble gas elements that have been isolated are:
- Helium
- Neon
- Argon
- Krypton
- Xenon
- Radon
The
The elements having the electronic configuration of
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Chemistry & Chemical Reactivity
- Which of the following elements would have the lowest first ionization energy? OLi Be B OC ONarrow_forwardWhich compound has the stronger bond? NaC2H3O2 or NaOarrow_forwardUse the above bond energy table to calculate the enthalpy of the following reaction in kJ/mol: 2H2CO2→ CO21E) + CHAE)arrow_forward
- Answer the following questions that relate to the chemistry of nitrogen. (a) Two nitrogen atoms combine to form a nitrogen molecule, as represented by the following equation. 2 N(g) ® N2(g) Using the table of average bond energies below, determine the enthalpy change, AH, for the reaction. Average Bond Energy (k) mol-1) Bond N-N 160 N=N 420 N°N 950 (b) The reaction between nitrogen and hydrogen to form ammonia is represented below. N2(g) + 3 H2(g)® 2 NH3(g) AH° = -92.2 kJ Predict the sign of the standard entropy change, AS', for the reaction. Justify your answer. (C) The value of AG° for the reaction represented in part (b) is negative at low temperatures but positive at high temperatures. Explain.arrow_forwardDraw the valence bond configuration for all the 3A, 5A, and 7A elements.arrow_forwardCalculate the second ionization energy of the metal M (AH¡on2 in kJ/mol) using the following data: Lattice enthalpy of MO(s), AH = -2278 kJ/mol Bond dissociation enthalpy of O2(g) = +498 kJ/mol %3D First electron affinity of O = -141 kJ/mol Second electron affinity of O = +744 kJ/mol Enthalpy of sublimation of M = + 125 kJ/mol First ionization energy of M = + 309 kJ/mol Standard enthalpy of formation of MO(s), AHf = -341 kJ/molarrow_forward
- Testosterone is an anabolic steroid. The structure of testosterone is shown below. What is the idealised bond angle at the indicated atom (ii) ? Hint: atom (iv) has been completed for you as an example. (iv) bond angle: 109.5°, geometry of the electron pairs: tetrahedral, shape of the bonds: tetrahedral ·····|||I H ····||||I ii ivarrow_forwardWhat is noble gas electron configuration of Zn2+ ?arrow_forwardPredict the electron pair geometry (EP) and the molecular structure (MS) of the ion H3O+.arrow_forward
- Write the electron configurations for: Calcium ion in CaCl₂:arrow_forwardDraw the Lewis structure for the xenon tetrafluoride (XeF) molecule. Carrow_forward10.) The structural formula of a certain aldehyde (related to formaldehyde) is H3C-CH2-CHO. Draw a Lewis structure for this aldehyde and determine the number of bonds present. Note that a single or a double or a triple bond counts as one bond. Write the number, not the word.arrow_forward
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