Chemistry question and answers for September 06, 2023
- Q A 25.0 mL sample of 0.150 M potassium hydroxide is titrated with0.125 M hydrobromic acid solution. Calculate the pH after thefollowing volumes of acid have been added: a) 20.0 mL...
- Q Calculate the pH for each case in the titration of 50.0 mL of0.240 M HClO(aq)0.240 M HClO(aq) with 0.240 M KOH(aq). Use theionization constant for HClO.What is the pH before...
- Q One of Albert Einstein's contributions to nuclear chemistry washis observation that energy and what are different manifestationsof the same thing?
- Q The Solvay process involves a reaction of sodium chloride,ammonia and carbon dioxide in aqueous solution. Of the variouspossible products, the one least soluble in water is?Select one alternative:“washing soda†(Na2CO3)\"baking...
- Q Explain how Fick
- Q how to calculate expected pH , buffer concentrationand buffer capacity?
- Q Which of the following describes reactions in which two hydrogenatom and one orxgen atom are removed to form water?a. they link monomersb. they are called condensation reactionsc. they disaemble polumersd....
- Q Iwant to measure the amount of Lead Pb in a soil sample ?I have done all the digestion calculation and procedures and Iused only 2 grams of soil .The instrument...
- Q Chemists often use molarity M, in moles/liter, tomeasure the concentration of solutions. Molarity is a common unitof concentration because the volume of a liquid is very easy tomeasure. However, the...
- Q Select all of the correct statements aboutreaction rates from the choices below.A. The lower the rate of a reaction the longer it takes to reachcompletion.B. A balanced chemical reaction is...
- Q perfectly insulated container with no heat capacity is used tomix together the following three samples of water:I.183.2 grams of water at 23.2 °CII.32.1 grams of water at 14.2 °CIII.143 grams...
- Q A magic number is the name given to certain numbers ofprotons or neutrons that have a high correlation to stability innuclei:magic numbers of protons:magic numbers ofneutrons:2,8,20,28,50,822,8,20,28,50,82,126,184A plot of the number...
- Q Assume that you have 0.480 mol of N2 in a volume of 0.700 L at300 K .1)Calculate the pressure in atmospheres using the ideal gaslaw.2)Calculate the pressure in atmospheres using...
- Q The formula for dimethoxyethane (dme) is H3COCH2CH2OCH3 and theformula forN,N,N',N'-tetramethylethylenediamine(tmeda) is (H3C)2NCH2CH2N(CH3)2.Tmeda is water-soluble. Is tmeda a strong acid, weak acid,strong base, weak base, or none of these? Briefly justify...
- Q Hydrogen gas can be prepared by reaction of zinc metal withaqueous HCl :Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)1)How many liters of H2 would be formed at 592 mm Hg and 17 ∘Cif 25.5 g of...
- Q Draw the following orbitals according to the radial and angularvariations of the wavefunction, including phases. Indicate thenumber of both radial and angular nodes for each orbital. Add axes,if appropriate.a) 4px...
- Q How much ice (in grams) would have to melt to lower thetemperature of 354 mL of water from 26 ∘C to 6 ∘C? (Assume thedensity of water is 1.0 g/mL.)
- Q The amino acid glutamic acid has the molecular formula C5H9NO4,and the amino acid isoleucine has the molecular formula C6H13NO2.Determine how many moles of isoleucine contain the same number ofatoms as...
- Q Piperazine, HN(C4H8)NH, is a diprotic weak base used as acorrosion inhibitor and an insecticide and has the followingproperties:pKb1=4.22 pKb2=8.67For writing the reactions of this base in water, it can behelpful...
- Q The corrosion of rebar inside concrete structures is seriousissue for the safety and stability of bridges and buildings. Thechemistry of corrosion is complex, but a simplified chemical model(iron rusting) is:...
- Q Identify which sets of quantum numbers are valid for anelectron. Each set is ordered(n,?,m?,ms).Check all that apply.4,3,4,-1/22,3,1,1/23,2,2,1/23,2,1,03,1,-1,1/21,0,0,-1/23,-2,-2,-1/22,2,-1, 1/22,2,1,-1/22,1,-1,-1/20,2,1,1/24,2,1,1/2
- Q A photometer with a linear response to radiation gave a readingof 690 mV with a blank in the light path and 101 mV when the blankwas replaced by an absorbing...
- Q Examples of chemical equilibrium in Nature or in our dailyenvironment (homogeneous and heterogeneous). Can you find exampleswith small and large extent?
- Q What is the pH of the solution formed when 30.0 g of potassiumnitrite (KNO2) is dissolved in 1.00 L of water.
- Q In gluconeogenesis, pyruvate is converted to PEP in tworeactions. These reactions include an initial carboxylationfollowed by a decarboxylation in the second reaction. Based onthese two reactions, you would assume that...
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