Max Planck proposed two postulates to explain the behaviour of the black- body radiation. Explain why the two postulates were said to contradict classical physics principles.

Q: 3. Solar radiation heats the surface after sunrise, and the resulting heat flux F to the atmosphere ...

A:

Q: . What factors can affect a solute's Rf value in thin-layer chromatography? 2. Why is it necessary ...

A: Answer - According to the question - Rf values and reproducibility can be affected by a number of di...

Q: Give the calomel electrode half cell diagram. What equailibria control the electrod potential of cal...

A: Answer: Electrode potential of a cell can be calculated by the formula shown below: Ecell=E°cell-0.0...

Q: Is the precision of your two trials within 5 %?. Support your answer with calculations

A: In order to analyze the precision of an experiment, we calculate the Percent relative standard devia...

Q: If 3830 J of heat is added to a calorimeter containing 75.40 g of water, the temperature of the wate...

A: Given,  Amount of heat added to calorimeter containing water = 3830 J  Mass of water = 75.40 g  Init...

Q: Calculate the standard energy change, A EU, for the reaction below. 12NH 3(g) +210 2(g) 8HNO 3 () + ...

A: Given that, a chemical reaction   We have to calculate the standard energy change of the reaction. ...

Q: NO 2 NO2 H N.

A:

Q: For the endothermic reaction: CaCO3 (3) Ca0 (3) + CO2 (g) Le Châtelier's principle predicts that O i...

A: Le Chatelier's principle: According to the Le Chatelier's principle when a change in concentration t...

Q: Problem no. 23-25 en the following data for the NH4* + NO2" – N2 + 2H20 reaction Trial Rate [NO2] 0....

A: K is rate constant

Q: 10.0 M NH3 pH: [H30+]: [OH-]: pOH:

A:

Q: OMg +o -> MgO Mg = Mg = %3D %3D 0 = %3D %3D

A: Complete the reaction by using coefficient---

Q: a) ОН ОН b) CI HO

A: Here we have to prepare the following compounds from the given starting material in multistep reacti...

Q: 10 3H 3H 2H

A: We have to determine the structure of the molecule by using the NMR spectrum. The molecular formula ...

Q: You will need to prepare 700mL of Phosphate buffer pH 5.8 by combining the 0.2M Phosphate Monobasic ...

A: Given: pH = 5.8 Volume of solution = 5.8 concentration of NaH2PO4 = 0.2 M Ka2 of H3PO4 = 6.2*10-8  

Q: [References] This question has multiple parts. Work all the parts to get the most points. a Calculat...

A: Answer: -390 KJ

Q: Combustion of hydrocarbons such as pentane (C,H12) produces carbon dioxide, a "greenhouse gas." Gree...

A:

Q: 30) What is the percent yield for the reaction below? Only 28.16 g of CO2 are observed to have forme...

A: Actual yield of CO2=28.16g Theoretical yield of CO2=225.3g Moles of C8H18=4mol Moles of O2=8mol

Q: Calculate the pH of a 7.51 M solution of HBRO. The K, of HBRO is 2.50 x 10.

A: Given :- concentration of HbrO = 7.51 M                 Ka of HBrO = 2.50 × 10-9  To calculate  ;- p...

Q: use the attached NMR spectrum to generate the structural formula of the compound .Unknown NMR # 8 wa...

A: H1-NMR  analysis of methyl ketone:

Q: Spectrophotometric of a Cobalt Chloride Solution Analysis 1. explain in detail the results o...

A: The wavelength at which maximum absorbance of a compound is obtained is known as lambda max. And as ...

Q: Which of the following bonds is the most polar bond? A) C –C B) C –O C) C –H D) C –Cl E) C –N Which...

A: Given:-   Which of the following bonds is the most polar bond?A) C –C B) C –O C) C –H D) C –Cl E) ...

Q: You are characterizing a new polymer, and found that your sample is composed of the following fracti...

A: Number average molecular weight is given by, Mn¯=Mnwhere, M=mass of polymern=number of moles When di...

Q: Estimate the boiling temperature at atmospheric pressure 1 atm for acetic anhydride using Van der Wa...

A:

Q: It is the study of the heat or energy involved in physical and chemical changes. Thermodynamics The...

A:

Q: 2. A chemical reaction proceeds in such a way that after the first second, the amount of a certain c...

A:

Q: Which is longer—a C–H bond or a C–O bond?        Which is shorter—an N–H bond or a C–H bond?   Arran...

A: stronger the bond between atoms, smaller will be there bond length.   

Q: When it comes to predicting the bond orders using MO theory and VB theory, which of the following st...

A: A question based on atomic structure that is to be accomplished.

Q: 2.Would 20 mL of your 1:1 (acetic acid: sodium acetate) solution prepared in Part B be able to buffe...

A: Buffer capacity is the ability of buffer to resist the change in pH.

Q: Which of the following expressions is the correct equilibrium-constant expression for the reaction b...

A: The eqilibrium constant can be defined as the ratio of concentration of products to concentration of...

Q: Он CH, OH H,C CH ČH, a) b) H,C c) он

A: Given structures of alcohols are : These products were formed via a Grignard reaction. What are the...

Q: A 0.2357 g sample of Na2C204 is dissolved in a small amount of water. This sample requires 33.64 mL ...

A: Mass of Na2C2O4 = 0.2357 g Volume of KMnO4 = 33.64 mL = 0.03364 L

Q: For each step in the reaction show the mechanisms. Each reactiond has at least one intermediate

A:

Q: A student prepares a stock solution of BaF2 by dissolving 50.00 g of a BaF2 in 1.00 L of water. An a...

A:

Q: 1  It is a mathematical expressions relating the concentration of reactants to the reaction rate ? ...

A:

Q: Which among these objects should you use to filter the precipitate in precipitation gravimetry?   D...

A: Please find your solution below : Gravimetry is a method of quantitative determination of analyte on...

Q: Determine AG for the reaction: 2C0(g) + 2H2(g) → CO2(g) + CH4(9) AH =-247.3 kJ/mol AS -256.5 J/mol K...

A:

Q: The titration solution in the cell below had a total volume of 50.0 mL and contained 0.100 M Mg2+ an...

A: Hii there, As there are multiple sub parts posted. we are answering first-three sub parts . If you n...

Q: Consider the structure of cyclobutyne, if it undergoes hydratio

A:   Internal akyne upon hydration gives ketone and acethylen gives aldehyde , by addition of water to...

Q: Which type of particles do we generally prefer for purposes of precipitation gravimetry?   Crystall...

A: particles which generally prefer for  precipitation gravimetric analysis is given below

Q: The equilibrium constant for the gas phase reaction N2 (g) - 3H2 (e)2NH3 (2) is Keq =434 x 10-3 at 3...

A: For any chemical reaction, the effect of temperature on the direction of equilibrium will depend whe...

Q: The reaction represented by the equation CO2(g) ---> C(s) + O2(g) is always ________

A:     Recall the given reaction,    CO2 (g)                          C (s)  +  O2 (g) We have to ident...

Q: Reaction with Ammonium Molybdate and dilute Nitric Acid

A:

Q: How much 0.5 M KOH must be added to 200 mL of 50 mM glycine at ph 8.6 to bring its ph to exactly 10....

A: Answer: Glycine is an amino that act as an buffer between the range of 8.6 to 10.6, therefore the pH...

Q: Choose the compound of molecular formula C7H13B1 that gives each alkene shown as the exclusive produ...

A: Alkyl halide on elimination gives alkene as final product.  

Q: 120. 100. - 80. erature (°C) 60. 40. 20. 10. heat added (kJ/mol) 0. 20. 30. 40. aph to answer the fo...

A: As we know,at this point,  melting of solid takes place.  

Q: 4. Producer gas from bituminous coal (see table below) is burned with 20% excess air. Calculate the ...

A:

Q: Please write the electron configuration of the following elements: Copper Sodium Nitrogen

A: Given elements: Copper  Sodium Nitrogen The distribution of electrons or electronic configuration of...

Q: Be sure to answer all parts. Predict the effect of decreasing the container volume on the amounts of...

A:

Q: Flow Chart for the Determination of Group I Cations Ag', Pb, Hg, + 6 M HCI I centrifuge Solid AgCl, ...

A: In qualitative analysis,cations are arranged in groups where each group share common reagent that ca...

Q: Check Your Understanding on Crystal Structure 1. Differentiate crystal structure, crystal system, an...

A: 1.  Crystal structure is made up of unit cells (repeating unit) and crystal structure is defined as ...

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.