Helium derives its name from the Latin name for the sun. Helium was discovered when spectroscopists found that the 588 nm wavelength (among others) was missing from the sun’s spectrum. What is the frequency of this radiation? Enter your response in scientific notation, e.g. enter 2E3 for 2000

Q: As a technician in a large pharmaceutical research firm, you need to produce 150. mL of a potassium…

A:

Q: no, ag) - SH"(ag) - Se Ma"(aq) + 4H;0m +1.51 V +1.33 V Cu"ag) - 2e Culs) "(ag) - 2e Pb(a) E"ag) +…

A: The combination which would give the positive Eocell value will occur.

Q: 7. In aqueous solution, hydrazine is a base that can accept two protons: N2H4(aq) + H2O(1)…

A: #7 (a): Since Kb2 << Kb1, the OH-(aq) contribution is mainly due to the 1st hydrolysis…

Q: Given the data, calculate the average rate of reaction for each successive time interval. What is…

A: Given reaction is, 2 N2O5→  4NO2+O2 We have to find the average rate of reaction at each given time…

Q: H3C,,, + enantiomer CH3 H3C CI

A: ->First of all there occur elimination reaction in presence of base and alkene formed. -> Then…

Q: H 2 H. + H:Y: The Lewis representation above depicts a reaction between hydrogen (blue) and a…

A: There are two types of bond formation -  1- ionic bond (donation of electron) 2- covalent bond…

Q: Click on the Run button in the activity. Watch how the solubility of a gas changes as pressure is…

A: The given statements are about the relation of pressure and solubility of gases. The relation that…

Q: 25. SYNTHESIS! Show how the following reactant (left) can be used to synthesize the product (right).…

A: It is an example of electrophilic aromatic substitution reaction. we are required to synthesize the…

Q: An electrochemical cell is shown below with Zn in ZnCl2(aq) and Cu in Cu(NO3)2(aq), and  KNO3(aq)is…

A:

Q: What hazards should you know about when you work with 6MHCl and 0.5M CuSO4?

A: (a) 6M HCI Pungent odour, strongly corrosive (dangerous) to body tissue. Protection respiratory…

Q: Using Table 15.2, the amount of water required to saturate 1 kilogram of air at -5°C is about O…

A: The answer is given below

Q: Review method used to increase the solubility of a drug under the following headings co solvents PH…

A: Various methods are used to enhance solubility of poorly soluble drug like physical and chemical…

Q: A critical reaction in the production of energy to do work or drive chemical reactions in biological…

A:

Q: What is the pH of a solution of 0.300 M HNO, containing 0.180 M NANO,? (Ka of HNO2 is 4.5 x 10-4)

A: Given- Concentration of HNO2=0.300M Concentration of NaNO2=0.180M Ka of HNO2= 4.5×10-4

Q: NH2 H3C CH, но H,N., A NH2 6 M H,SO, H3C. H,C H3C. H,C HO, H,C CH, CH CH NaOAc…

A:

Q: Below is one of the polypeptide chains in the insulin structure. a. What is the amino acid residue…

A:

Q: Consider the following reaction, and choose all correct answers below. [Select all that apply]…

A: CH4(g) + 2O2(g) ---> CO2(g) + 2 H2O(l) -> when oxidation state incresese that species get…

Q: A 0.245−mol sample of HX is dissolved in enough H2O to form 595.0 mL of solution. If the pH of the…

A: pH= 3.60

Q: Chapter 16 Multiple Choice Question 48 Part A Determine the [OH] concentration of a 0.741 M KOH…

A: pOH of solution is defined as negative logarithm of hydroxyl ions in solution.

Q: Use the data given below to answer the next three questions. 2 N20 (g) + 3 02 (g) → 4 NO2 (g) AH° =…

A:

Q: What is the equation for the reaction between Cu(s) and MgSO4(aq)?

A:

Q: NaH ND CH OTs MCPBA 8) CH,CI, NaOH HO KOH 人人l NAOH

A: MCPBA prefer to do epoxidation this reagent is electron deficient in nature thus it attack on…

Q: there may be several correct answers The pyrimidine heterocyclic system is present in the structure…

A: pyrimidine heterocyclic system is a six membered system consist of 4 carbons and 2 nitrogens atom.…

Q: HHI 20.45 What monosaccharides are formed when the following disaccharide is hydrolyzed? CH,OH 1.…

A: Hydrolysis of disaccharide gives two mono saccharide...

Q: Given the following: 100g of HCl (37.7%) mass % of H2O in the bottle is 62.3%. Find molality and…

A: Given: Mass of HCl = 100 g. Mass percent of HCl = 37.7 % And mass percent of water = 62.3 %

Q: Consider the reaction described by the equation C,H,Br, (aq) + 3I-(aq) C,H,(g) + 2 Br (aq) + I, (aq)…

A:

Q: He 2A 3A 4A SA 6A 7A Li Be B C NOF Ne Na Mg 38 Al Si S C Ar 48 58 68 78 18 28 K Ca Sc Ti v Cr Mn Fe…

A: Thr spectroscopic notation electron configuration of P is

Q: Consider the following reaction: CH,COOH(ag) +OH (ag) CH,COO (aq) +H,0(1) v 1st attempt Jul See…

A: Given: Concentration of NaOH = 5.80 M Concentration of CH3COOH = 0.0190 M Concentration of CH3COONa…

Q: ce AH°rxn for ΔΗ

A:

Q: Complete the starburst scheme below by predicting the product of each reaction. CH2N2 HBr O3 then\…

A:

Q: 1) Consider this reaction: Pb + PbO2 + 2SO3 → 2PBSO4 AH°rxn = -775 kJ How much heat will be released…

A:

Q: Bromine monochloride is synthesized using the reaction Br, (g) + Cl, (g) 2 BrCl(g) K, = 1.1 x 104 at…

A: The balanced reaction given is, => Given: Volume of flask = 193.0 L Mass of Br2 taken = 0.956 Kg…

Q: Exhibit 17-1 Use this list of half-reactions to answer the following question(s). MnO4−(aq) +…

A: We have given the value of the reduction potential of half cells. Oxidising agent is the agent which…

Q: Part A The forensic technician at a crime scene has just prepared a luminol stock solution by adding…

A: Given: The mass of luminol in the solution = 12.0 g The volume of H2O added = 75.0 mL We have to…

Q: Given AH°= +500 kJ/mol and the equilibrium constant, K = 1 x 10-10 , which of the following is…

A: In this question, we have to choose the correct option regarding the given data values.

Q: What is the equilibrium constant K for a redox reaction that has E°cell = 1.98 V at 25°C ? Assume 1…

A:

Q: in a A solution prepared by mixing 22.2 mL of 0.400 M NaCl and 22.2 mL of 0.400 M KI was titrated…

A: Given, Volume of NaCl = 22.2 mLConcentration of NaCl = 0.40 MVolume of KI = 22.2 mLConcentration of…

Q: How many kilojoules of energy are generated when in 82.8 grams of CO(g) reacts according to the…

A: Weight of CO = 82.8 gm

Q: Pärt B If the normal physiological concentration of HCO3 is 24 mM, what is the pH of blood if Pco,…

A: We have find out the pH of blood if PCO2 drops to 28 mmHg.

Q: What mass (in grams) of Mg(NO3)2 is present in 148 mL of a 0.500 M solution of Mg(NO3)2? 6.39 g O…

A: The answer is given below

Q: What is the pH of a 0.1000 M NH4BR solution? (Kb NH3 = 1.8x10^-5) %3D

A: Given-> Concentration of NH4Br =0.1000 M Kb = 1.8 × 10-5

Q: there may be several correct answers The formation of an azo dye is possible for drugs: A. Chinozol…

A: Correct option is B.

Q: At a certain temperature, the solubility of N2 gas in water at 4.07 atm is 95.7 mg of N2 gas/100 g…

A:

Q: Which of the following compounds does not have tetrahedral electron-pair geometry? Draw Lewis…

A: The compounds given are a. PCl3 b. NO2− c. CCl4  d. H2O e.H3O+

Q: How many moles of electrons are required to produce 18.1 g of potassium metal from a sample of…

A: We are hereby asked that how many moles of electrons are required to produce 18.1 g of potassium…

Q: According the the Law of Conservation of Mass, if 5 g of reactant A react with 5.4 g of reactant B,…

A: • Reactant A and reactant B combine to form product AB. This can be represented as,…

Q: A sample of gas with volume 21.4 mL at STP is expanded to a pressure of 0.98 mmHg at a temperature…

A: Given :-  initial volume at STP = 21.4 mL final pressure = 0.98 mm Hg final temperature = 24°C  To…

Q: What is the pH of 0.45 M NaF?

A: Given : Concentration of NaF = 0.45M

Q: Write a complete ionic equation for the following reaction.…

A: Complete Balanced chemical equation is, Hg2(NO3)2(aq)+2LiBr(aq)→Hg2Br2(S)+ 2LiNO3.

Q: abel the conjugate acid-base pairs in each eqld HI + NH3=NH* +I b. HCOOH+ H2O=H;O* +HCOO c. HSO4…

A: Given that concentration of OH- is each solution as, a. OH- = 10-5 M b. OH- = 10-12 M We have to…

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.