Why is light of at least a certain frequency needed to cause the photoelectric effect? O A certain quantity of energy is necessary to eject electrons from a metal A certain number of photons is necessary to eject electrons from a metal O A certain temperature is necessary to eject electrons from a metal O A certain number of atoms is necessary to eject electrons from a metal O A certain speed of light is necessary to eject electrons from a metal

Q: Determine the rate law for the reaction described in each of the cases below involving species A, B,...

A: Unit of rate of reaction = M/time 1 litre = 1 dm3  Time can be in minutes or hours or seconds.  So, ...

Q: What coefficients (in order from left to right) are needed to balance the following chemical equatio...

A: What coefficients (in order from left to right) are needed to balance the following chemical equatio...

Q: What is the molar ratio of the balanced chemical equation? 6 CO2 (g) + 6 H2O (l) → C6H12O6 (g) + 6 ...

A: Carbon dioxide reacts with water to form glucose and oxygen. The equation for the balanced chemical ...

Q: 1.) Arrange ice, liquid water, or water vapor according to their decreasing strength of intermolecul...

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

Q: Lewis structure for

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Q: How many grams of KBrO3, 167.0 g/mol, are required to prepare 0.625 moles of Br2 according to the ba...

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Q: 2. 1.5 L of 0.117 M NaOH from a commercial reagent that is 50% w/w and a specific gravity of 1.525

A: 2. Given,  Specific gravity = 1.525  50% w/w NaOH solution means, 50 g NaOH in 100 g Solution.  Mass...

Q: A buffer is made up of 15.0 ml of 0.1 M HC,H,02 and 15.0 ml of 0.1 MNa CH,O, The solution is diluted...

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Q: rection: Match the following compounds in column A to their respective chemical formulas in column B...

A: Below attached file showing the details answer. All the best. 

Q: What is the molar ratio of the balanced chemical equation? N2H4 (l) + N2O4 (l) → 2

A:   Given reaction is hydrazine reacts with dinitrogen tetraoxide to give nitrogen gas and water  To t...

Q: A o bond arises from the straight-on overlap of two atomic Sigma Bonding orbitals. The electron dens...

A: Hybridisation is defined as mixing of orbital having different energy so as to rehybridize to form n...

Q: The molality of a KMNO4 solution is 0.933 at 25°C. What is the mole fraction of potassium permangana...

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Q: 8 cm th

A: Given that, Dimension of furnace wall,l×b×h=4×3×3 m3  Thermal conductivity of inner brick, kb=0.4 W/...

Q: Consider the following exothermic reaction: C2H4 (9) + Cl2 (9) = C2H¾C12 (g) Part A If you were a ch...

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Q: 5. What is the pCa of a 50ppm Ca(NO3)2

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Q: A reaction vessel is charged with 0.50 atm of A and 0.180 atm of B. Once the reaction reaches equili...

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Q: AU = 0 for any isothermal process.

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Q: noles

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Q: in the group also cause a bathochromic shift, even thongh they are devoid ofp-orn-electrons a) C=C C...

A: We have to tell, in the given molecule which group causes a bathochromic shift, even though they are...

Q: (4) Determine the point group of CHa and show the symmetry elements/operations using 3D drawing. (5)...

A: In point group classification we have to find out different axis of rotation,plane of rotation ,if a...

Q: At a certain temperature this reaction follows second-order kinetics with a rate constant of 13.2M '...

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Q: Unknown compound D has a melting point of 102-103 degrees C. Carbon/ Hydrogen analysis of compound D...

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Q: How many grams of BaCl2 2H2O must be dissolved in 1.50 L of water to yield a 0.250 M BaCl2 solution?...

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Q: A 5.83-mg sample of compound F (whose empirical formula is CH) dissolved in 57.3 mg of camphor lower...

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Q: Bucks McGee, after being poisoned, is currently being treated in the hospilal antidote- the chemical...

A: Antidote compound name = Prussian Blue The molecular weight of the antidote compound = 858.9 g/mol N...

Q: Describe the preparation of the following reagents. 1. 250 mL of a solution that is 0.0376 N Mgl2 fr...

A: (1)  Given that -  Volume of MgI2 = 250 mL  Normality of MgI2 = 0.0376 N  Then -  Normality = Weight...

Q: The reaction between hydrazine and dinitrogen tetroxide in their liquid forms is used to propel rock...

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Q: Spontaneity

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Q: When a silver and a saturated calomel electrodes are inserted in a solution of 0.10 M Ag(NH3)2", the...

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Q: Calculate. 5. What is the pCa of a 50ppm Ca(NO3)2

A: Using a formula like this pH = -log[H+] where H+ is the concentration of ions. here use, Pca = -log[...

Q: Bucks McGee, after being poisoned, is currently being treated in the hospital with an antidote- the ...

A: Name of antidote = Prussian blue  The molecular weight of the antidote compound =  858.9 g/mol Volum...

Q: This step involves the assessment of the polarity of the solute relative to the front Application of...

A: A question based on analytical separations that is to be accomplished.

Q: 36. express 0.0345 in exponential form 37. convert 15 °C to degree Fahrenheit 38. convert 0.35L to c...

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Q: are are more soluble i

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Q: Consider the reaction 2H2(g) + O2 (g) = 2H2O(g) How will the equilibrium shift when hydrogen gas is ...

A: HSAB concept- Hard- Hard And Soft-Soft interactions are strong. 

Q: 2.050 g of an unknown sample contains H, S, and O. If the compound contains 0.0500 g H and 0.800 g o...

A: Total weight of unknown sample = 2.050g  Mass of H = 0.0500g  Mass of S = 0.800g 

Q: Calculate the mass of 1.92 x 1018 atoms of Mg. O 2.73 x 10-10g O 2.16 x 10-10 g O 1.62 x 104g O 1.08...

A: Given,  1.92x1018 atoms of Mg  We know that,  1 mol = 6.023x1023 atoms 

Q: A student is asked to standardize a solution of calcium hydroxide. He weighs out 0.945 g potassium h...

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Q: How many chiral carbon atoms are here in the Cholesterol molecule? What is the configuration, R or S...

A: A chiral carbon atom have 4 different group attachment.

Q: DRAW THE SOLID WEDGE AND DASH FORMULA OF: HCN (TAKE NOTE OF THE BONDS) DRAW THE LINE ANGLE FORMULA...

A: A chiral molecule can be represented in wedge-dash system using wedge for above the plane ,dash for ...

Q: [D] [N] [A] Trial 1 Trial 2 Trial 3 0.1 N 0.1 N 0.1 N 0.1 N HCI 0.1 N HCI 0.1 N HCI NaOH NaOH NaOH F...

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Q: Kc for the reaction of hydrogen and iodine to produce hydrogen iodide.  H2(g) + I2(g) ⇌ 2HI(g) is 54...

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Q: 33. KMNO.

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Q: Which of the following species is likely to be a nucleophile and which an electrophile? (a) CH3CI (b...

A: This question belong to reaction mechanism organic chemistry.  Electrophile : all positively charged...

Q: 8. For the overall reaction: 2NO (g) + O2 (g) → 2NO2 (g), the following mechanism has been proposed:...

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Q: Calculate the pH of a solution formed by adding 5.00 grams of solid sodium formate, NaCHO₂, to 180.0...

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Q: If 0.0750 moles of barium hydroxide were added to water, how many moles of OH- would be produced? mo...

A: Given, Chemical formula of barium hydroxide - Ba(OH)2 Moles of barium hydroxide, Ba(OH)2 = 0.0750 mo...

Q: Photosynthesis in plants converts carbon dioxide and water into glucose and oxygen. Calculate the ∆H...

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Q: Which chemical is a good neutralizing agent for an acid spill? A) Ba(ОН)2 B) Na,SO4 С) NaOH D) NaHCO...

A: For neutralizing acid spill we generally use weak base.. Acid spill is hydrochloric acid or sulfuric...

Q: Use the graph below as reference: What is the boiling point of pure toluene? O a. 110 % O b. 109 % ...

A: Given, A phase diagram of toluene and cyclohexane is provided as reference       Required,          ...

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.