When an atom in an excited state changes to the ground state it:   a. releases energy   b. gains energy   c. does not change energy

Q: How many acid-base steps occur in this mechanism? :OH :OH ₂ H CI: -H₂O (C5H₁2O) (C5H130+) (CgH*)…

A: Acid : Proton donar. HCl is acid because it will provide protons. Base : Proton acceptor. Here…

Q: What is the electron pair geometry, lewis structure, molecular geometry, and hybridization of…

A: In electron pair geometry both lone pair and bond pair is considered but in case of molecular…

Q: A galvanic (voltaic) cell consists of an inert platinum electrode in a solution containing 1.0 M…

A: We will calculate the standard reduction potential at 25 degree centigrade.

Q: 4. Show how to make each compound from an alkene (pay attention to regiochemistry) OH OH

A: 4. We have to give the structures of the Alkenes that give the desired alcohols.

Q: 10. What is the sign (positive or negative) of the entropy change (AS) for each of the following: a.…

A: Given :-  a) H2O(l) → H2O(g)   b) N2(g) + 3H2(g) → 2NH3(g)  To determine :-  Sign for ∆S for given…

Q: fusion reactions:

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Q: In the reaction N2 + 3H2 = 2NH3, increasing the pressure will: a) increase the concentration of NH3…

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Q: Which among the given molecules can exhibit tautomerism? Ph Ph I II III (a) III only (b) Both I and…

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Q: Write the chemical formula of the following complex ions. formula name hexafluoromanganese (VII)…

A: Multiple question given here.

Q: Click in the answer box to activate the palette. Use the half-reaction method to balance the…

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Q: 3. Sketch a titration curve for the titration of 0.100 M NH3 (weak base) with 0.100 M HCI. Label the…

A: We have sketch the titration curve for titration of 0.100 M NH3 with 0.100M HCl.

Q: [Review Topics] [References] Use the References to access important values if needed for this…

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Q: What percentage of the recommended daily dose of calcium (1,150 mg/day) does 1.0 L of your water…

A: The hardness of water in terms of ppm is taken as 66.73 ppm. Further 1 ppm is equal to 1 mg/L of…

Q: One fission reaction that takes place in nuclear reactors is Isotope or particle 235U 139 235U + n →…

A: The explanation is given below-

Q: Write a net ionic equation to show that nitrous acid behaves as a Brønsted-Lowry acid in water. BL…

A: According to Bronsted-Lowry acid base concept, the substance which donate proton is an acid and the…

Q: Consider this overall reaction, which is experimentally observed to be second order in X and first…

A: The rate equation for the given reaction  is,…

Q: Structures of monosaccharides are a) polymers b) pyranoses or furanoses c) aldoses or ketoses d)…

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Q: In a solution prepared by dissolving 0.100 mol of propionic acid in enough water to make 1.00 L of…

A: Given that 0.1 mol of propionic acid is dissolved to make 1 L solution . That is its concentration…

Q: Find the pH of a 1.3x10-5 M HCI solution. 4.89 If 1 mL of 0.1 M NaOH is added to 1 L of the acid,…

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Q: Q2:- Calculate the value of the ionization constant, K₁, for aniline if the pK, is 10.5?

A: The base dissociation constant for base is known as Kb.  This is also called as ionization constant.…

Q: 14) In an electrochemical cell made of Al and Cu, Al loses 3 electrons per atom while Cu gains 2…

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Q: REACTIONS 1. concentrated sulphuric acid + solid potassium chloride 2. concentrated sulphuric acid +…

A: When sulfuric acid reacts with halide ion they undergoes redox reaction. Here from the given…

Q: centration of CO when at equilibrium?

A: Equilibrium concentrations of H2 & CO = 0.0046 M Kc = 0.0049  As the coefficients of products…

Q: 14. Propose synthesis of wing compound wing ar

A: Please note- As per our company guidelines we are supposed to answer only one question. Kindly…

Q: Consider the following system at equi 2HI(g) =H₂(g) + I2(9) If the TEMPERATURE on the equilibr The…

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Q: How would you classify the structure below: A. strong base/strong nucleophile (SB/SN), B. strong…

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Q: Consider the following list of possible concentration cells. Which ones listed would have a positive…

A: for the concentration cell: Standard potential of the cell (E0cell) = 0V E0Cu2+/Cu = 0.34V E0Cu2+/Cu…

Q: Chernobyl expelled lots of Cs-137 radioisotopes in the environment in 1986.  The half-life of Cs-137…

A: We have to calculate the radioactivity after 60 years.

Q: Consider the following system at equilibrium where AH° = -111 kJ/mol, and Kc = 0.159, at 723 K. N₂…

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Q: Which of the following functional groups will react with a base sodium hydroxide? OH HO a Od o NH₂

A: Reactivity of NaOH towards various functional groups

Q: B. Carboxylic acid

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Tc-99m is commonly used in nuclear medicine.  It has a half-life of 6 hours.  The radioactivity dose…

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Q: An NaCl crystal may be best described as which type of crystal? A)  ionic   b)  covalent  c)…

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Q: A solution contains 1.09×10-2 M chromium(III) nitrate and 7.65×10-3 M aluminum acetate. Solid sodium…

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Q: 2. Give the values of the four quantum numbers of an in the following orbitals: (a) 3s, (b) 4p, (c)…

A: Four quantum numbers of an electron

Q: 7. You have 1.0 L of 100 mM K₂HPO, solution. What volume of 1.0 M HCI must be added to adjust the pH…

A: When HCl is added to K2HPO4 solution, HCl will donate it's proton. So we would first draw an ICE…

Q: (a) What is the total number of valence electrons in the propylene molecule? (b) How many valence…

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Q: The following questions refer to the electrochemical cell shown in the diagram above. a. Write a…

A: Standard cell potential  E°cell = E°reduction - E°oxidation  E°oxidation and E°reduction are the…

Q: ) What fraction of a radioactive sample remains after one, two, and three half-lives have elapsed?…

A: Radioactivity is a nuclear phenomenon where nucleus of a heavy element undergoes spontaneous decay…

Q: Considering that molecular dipole generally increases with extent of electron delocalization…

A: Greater the extent of conjugation greater will be the dipole moment.

Q: half-life for the reaction

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Q: a.) b.) c.) (i) KMnO, OH, A (ii) H₂O* CH3COOH + PC13 BrCH₂CH3 (i) NaCN (ii) H₂O* 91

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Q: Chromate is used as an indicator with AgNO3 to determine the number of moles/concentration of…

A: A question based on mole concept that is to be accomplished.

Q: Topics] [References] Use the References to access important values if needed for this question. ula…

A: Bronsted Lowry acid base theory,  Bronsted Lowry acid is the substance which donate proton while…

Q: 2.5 100- 80 60 40 20 0 4000 STRANSMITTANCE O=C-H saturated C-H 3500 3.5 3000 N-H alcohol O-H 4 4.5…

A: 3300 cm-1 is N-H stretch, 3050 cm-1 is sp2 C-H stretch, 2900 cm-1 sp3 C-H stretch, 1620 cm-1 C=C…

Q: What is the major product obtained for the following reaction (excess), NaOH (excess) 1.Br₂ 2.…

A: We have to find the major product of the reaction.

Q: What is the major product of the following reaction? NaCl, H₂O A. B. C. D. E. Nal + H₂O + ??????

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Q: For a reaction where ∆H° = +573 kJ/mol and ∆S° = +1.64 kJ/mol･K, at what temperature, in K, does…

A: For a reaction to be spontaneous the value of ∆G° must be negative.

Q: I need help and chegg might have the wrong answer I need help with B

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Q: Calculate the final pressure, in millimeters of mercury, for each of the following, if V and n do…

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Quantum Chemistry

Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.