Chemistry question and answers for September 19, 2023
- Q 1) Oxidation refers to...a) an increase in Oxidation number. b) a decrease in Oxidationnumber. c)an increase in atomic number. d) an increase in mas.
- Q 1. The molar mass of a compound is 126 g/mol, and it's empiricalformula is C2H2O. What is compound's molecular formula?2. A compound consist of 26.18g Si and 29.82g O. Calculate...
- Q A fire extinguisher has a pressure of 12 atm at 25∘C.What is thefinal pressure, in atmospheres, when the fire extinguisher is usedat a temperature of 63 ∘C, if Vand n...
- Q Molarity of standard NaOH solution: x/1 H 2/3 Unknown + 2/3 NaOH-> 2/3 H2O +Na 2/3 AcetateVinegar:Titration 1Titration 2Tirtration 3Initial V of Acid.01 mL5.56 mL11.32 mLFinal V of Acid5.56 mL10.71...
- Q What products result when calcium carbide is combined withwater?
- Q C: CaCO3 (s) ----> CaO (s) + CO2 (g) delta H= +178kJ/molD: PCl3 (g) + Cl2 (g) -----> PCl5 (g) delta H= - 88 kJ/molClassify these changes as either LEFTWARD...
- Q Which assay is more likely to be accurate for BSAconcentrations: ninhydrin or Bradford, and why?(a) Tell me the different forms of Coomassie Blue at differentpH's (b) Tell me what causes...
- Q Please answer and exaplain ALL 4 parts! Thank you!A 3.00 mL aliquot of 0.001 M NaSCN is diluted to 25.0 mL with0.2 M Fe(NO3)3 and 0.1 M HNO3.1. How many...
- Q Consider the following reaction:CO(g)+2H2(g)⇌CH3OH(g)CO(g)+2H2(g)⇌CH3OH(g)The reaction between COCO and H2H2 is carried out at a specifictemperature with initial concentrations of COCO = 0.32  MM and H2H2 = 0.52  M M. At equilibrium, the...
- Q In the williamson ether synthesis of n-butyl methyl ether from1-bromobutane, sodium, and ethanol, how could the purity as well asthe percent yield of the product be improved?
- Q What are the rules for net ionic equations? I know you mustfollow the solubility chart, but I'm confused about the otheraspects. When the compound is solid, gas or liquid, I...
- Q HClO is a weak acid (Ka=4.0×10^−8) and so the salt NaClO acts asa weak base. What is the pH of a solution that is 0.037 M in NaClOat 25 °C?
- Q Which of the following has the highest boiling point? Pleaseprovide an explanation on how to solve this!a.CH3OH               b.CH3Cl                 c.CH3SH                d.CH3CH3                      e. CH3F
- Q What is the concentration of a solution created bymixing 25g of C3H6O(L) (D = 0.774g/mL) with 25g of CH4O(L) (D = 0.890g/mL)?
- Q impact of global warming on the environment?i need a short introduction and the three pages that talksabout the impact of global warming on the environment side
- Q A 27.7 mL sample of 0.314 M ethylamine, C2H5NH2, is titratedwith 0.325 M nitric acid. The pH before the addition of any nitricacid is .Use the Tables link in the...
- Q What is the molarity of a solution that contains 18.7 g of KCl(MW=74.5) in 500 mL of water?25 g of NaOH (MW = 40) is added to 0.5 L of...
- Q Using the appropriate Ksp value from this table, calculate thepH of a saturated solution of Ca(OH)2.
- Q Foreach of the following unbalance chemical equation suppose thatexactly 15.0g of each reactant is taken. Determine which reactantis limiting and calculate what mass of each product is expected. (assume that...
- Q Consider an ionic compound, MX2MX2 , composed of generic metalMM and generic, gaseous halogen XX .The enthalpy of formation of MX2MX2 is ΔH∘f= −817ΔHf∘The enthalpy of sublimation of MM is...
- Q I start with 3 mL of [Ru(bpy)3](PF6)2 solution. Every time Add100 uL volume of DPA solution with 0.05M. Do it five times, thetotal amount of DPA is 500ulVconcentration of DPA100ul200ul300ul400ul500ulI...
- Q Express your answer in complete form in the order of orbitalfilling as a string without blank space between orbitals. Forexample, 1s22s2 should be entered as 1s^22s^2.1. Ca2+2. K+3. S2−4. Br-
- Q Rank the following 0.10 M solutions in order ofincreasing pH. (Use the appropriate <, =, or > symbol toseparate substances in the list.)(a)Â Â Â Â HBr, LiBr, HF, LiFchemPadHelp(b)Â Â Â Â HI, RbI, NH3,NH4IchemPadHelp(c)Â Â Â Â C5H5NHNO3,C5H5N, HNO3, LiNO3,LiOBr,...
- Q A mixture of 136.4 g136.4 g of Cl2Cl2 and 29.8 g29.8 g of PPreacts completely to form PCl3PCl3 and PCl5.PCl5. Find the mass ofPCl5PCl5 produced.
- Q for a diatomic perfect gas , derive the equation for entropy S ,enthalpy H , Gibbs energy G . and Helmholtz energy A
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