Chemistry question and answers for August 21, 2023
- Q When a strong acid is neutralized by a weak base is theneutralization complete? Write the neutralization reaction forHClO4 and NH3. What is the value of Kn (equilibrium constant forneutralization)? (Kb(NH3)=1.810‒5)...
- Q Hydrazine, NH2NH2, is a weak base. The following is theequilibrium equation for its reaction with water:NH2NH2(aq) + H2O(l) <----------> NH2NH3+(aq) +OH-(aq)Â Â Â Â Kb = 8.5 x 10-7What is the hydronium ion...
- Q Problem 1: For the reaction 2CH3OH(l) +3O2(g) = 2CO2 +4H2O(l) I calculated that the change in molarentropy of the system is 313.7Joules/(moles*kelvin). The question then asked what is the entropychange...
- Q How do alpha-helices create different surfaces (such as ahydrophobic side)?
- Q What is the change in enthalpy (in kJ) under standard conditionswhen 233.71 g of sodium sulfate dissolves in water?
- Q Calculate the volume of each gas sample at STP.Part A51.1 g HePart B47.0 g XePart C49.6 mg Cl2Part D3.82 kg SO2.
- Q Define an acid, base, and salt as they apply to chemistry andState three examples each of acids, bases, and salts commonly usedin therapeutic processes.From the examples you state, select one...
- Q Part AA 50.0-mL volume of 0.15 M HBr is titrated with 0.25 M KOH.Calculate the pH after the addition of 18.0 mL of KOH.Part BA 75.0-mL volume of 0.200 M...
- Q In terms of entropy and the real world, what is the end resultof a spontaneous process?
- Q When running chromatography, one way to improve resolution anddecrease peak width is by dropping the flow rate.a. Which variable in the van demter equation does this influenceand how? (please explain...
- Q A volume of 25.0mL of a 0.10M aqueous solution of aceticacid(HC2H3O2 or HOAc orCH3CO2H, Ka=1.8x10-5) is titratedwith 0.080M NaOH.What is the pH InitiallyAfter 10.0mL of NaOH has been addedAt the...
- Q Solve for the new pressure in each of the following, withn and V constant:aA gas with a pressure of 1.25atm at 60 ∘C is cooled to -24 ∘C.b. A sample...
- Q What mass of AgCl can be prepared by the reaction of 100.0 ml of0.20 M aqueous AgNO3 with 100.0 ml of 0.15 M CaCl2? Write themolecular and net ionic equations.
- Q A-What is the pH of a buffer prepared by adding 0.405 mol of theweak acid HA to 0.305 mol of NaA in 2.00 L of solution? Thedissociation constant Ka of...
- Q You need to prepare an acetate buffer of pH 5.52 from a 0.881 Macetic acid solution and a 2.64 M KOH solution. If you have 875 mLof the acetic acid...
- Q Calculate the pH for each of the following cases in thetitration of 25.0 mL of 0.100 M pyridine, C5H5N(aq) with 0.100 MHBr(aq):(a) before addition of any HBr(b) after addition of...
- Q The buffer system in human blood buffer is composed ofHCO3- and H2CO3. (TheKa for carbonic acid is 7.9 x 10 -7).a. Please identify the acidic and basic component of thebuffer.b....
- Q Copper has been used for thousands of years, either as a puremetal or in alloys. It is frequently used today in the productionof wires and cables. Copper can be obtained...
- Q Based on the thermodynamic properties provided for water,determine the energy change when the temperature of 0.750 kg ofwater decreased from 111 °C to 51.0 °C.Melting point0°CBoiling point100.0°CΔHfus6.01kJ/molΔHvap40.67kJ/molcp (s)37.1J/mol · °Ccp...
- Q Consider the following system at equilibrium where Kc =1.29×10-2 and H° = 108 kJ/mol at 600 K.COCl2 (g) CO (g) + Cl2 (g)The production of CO (g) is favored by:Indicate...
- Q The specific heat capacity of silver is 0.24J/C.g .Calculate the energy required to raise the temperature of 151.0g from 278 K to 299 K.Energy = JCalculate the energy required to...
- Q Lead (II) nitrate and aluminum chloride react according to thefollowing equation: 3Pb(NO3)2 + 2AlCl3 → 3PbCl2 + 2Al(NO3)3. In anexperiment, 8.00 g of lead nitrate reacted with 2.67 g of...
- Q Which would be the best emulsifier of soil if soft water (noCa2+ ions, Mg2+ ions, and so on) wereused?a. A soap.b. A detergent.c. Both would be about the same.Explain your...
- Q Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, andan unknown amount of propane, C3H8) were added to the same 10.0-Lcontainer. At 23.0 ∘C, the total pressure...
- Q A gaseous mixture of O2 and N2 contains 40.8 % nitrogen by mass.What is the partial pressure of oxygen in the mixture if the totalpressure is 385 mmHg ? Express...
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