Answers edited by Jacob T.

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• A first order reaction take 100 minutes for completion of 60 Decomposition of 60% of reaction find the time when 90% of reaction complete?
  
• How would you balance #"H"_3"BO"_3"##rarr##"H"_4"B"_6"O"_11" +H"_2"O"#?
  
• What is the pH if 50.0 mL of 0.100 M HCN is mixed with 100.0 mL of 0.100 M NaOH?
  
• A chemical reaction has #\ \ DeltaH^{circ}=-5.8\ text{kJmol}^{-1]\ \ # and an equilibrium constant of #\ \ 2.1\ \ # at #\ \ T=298\ K.\ \ #...?
  
• The halflife of a radioactive isotope is 20.0 minutes. How much of a 1.00 gram sample of this isotope remains after 1.00 hour?
  
• Calculate the mole of carbon dioxide when 11.2L of methane atSTP is ignited in excess of air?please explain?
  
• An oxygen tank kept at 20oC contains 28.0 moles of oxygen and the gauge reads 31.0 atm. After two weeks, the gauge reads 10.5 atm. How many moles of oxygen were used during the two-week period?
  
• What are the asymptotes of #y=1/(x-2)+1# and how do you graph the function?
  
• Phenylbutazone can be synthesised, in a multi-step process, starting from compound A. Elemental microanalysis showed that compound A has a composition, by mass, of 50∙0% C; 5∙60% H; 44∙4% O Calculate the empirical formula of compound A?
  
• Even if i keep on increasing the frequency,why does the no of photo-electrons emitted from a metal surface reach a maximum and remain constant at that value?
  
• What is the average atomic mass of an element if, out of 100 atoms, 5 have a mass of 176 amu, 19 have a mass of 177 amu, 27 have a mass of 178 amu, 14 have a mass of 179 amu, and 35 have a mass of 180 amu?
  
• 3H2 + N2----≥ NH3. All of the following will lead in this reaction to the production of more NH3 except? Correct answer is a decrease in the volume of the container, but by decreasing volume pressure increase(Boyle's law) so reaction should proceed in f
  
• Five books of different heights are arranged in a row. Find the probability that (a) the tallest book is at the right end. (b) the tallest and shortest books occupy the end position (c) the tallest and shortest books are together ?
  
• What is the energy released by 20 grams of 100°C steam that condenses and then cools to 0°C?
  
• If you drop a 200 gram piece of metal with a temperature of 110 degrees Celsius into 1000 grams of water at 25° Celsius, what best describes what would occur? The water will quickly reach the boiling point. The water's temperature will stay the same, b
  
• If #"0.50 M"# of #"NH"_4"OH"# were to dissociate in water, and #K_b = 1.773 xx 10^(-5)#, what is the resultant #"pH"# at equilibrium?
  
• A 100.0 mL sample of a solution that is 0.125 M in HClO and 0.130 M in NaClO has added to it 2.00 mL of 0.100 M HCl. The Ka for HClO is 2.9 x 10-8. What is the pH of the resulting solution?
  
• Why does CS2 have higher boiling point than OCS (C as central atom)?
  
• How do you find the inverse of #f(x)=sqrt(x-3)#?
  
• A cone has a height of #12 cm# and its base has a radius of #8 cm#. If the cone is horizontally cut into two segments #4 cm# from the base, what would the surface area of the bottom segment be?
  
• Find the ionization energy of #"C"^(5+)#?
  
• Consider the equilibrium system #CO(g) + Fe_3O_4(s) ⇌ CO_2(g) + 3FeO(s)# How does the equilibrium position shift as a result of each of the following disturbances?
  
• How many moles of oxygen are produced by the decompositon of 6.0 moles of potassium chlorate, KCLO3?
  
• A 1.0 kW heater supplies energy to a liquid of mass 0.50 kg. The temperature of the liquid changes by 80 K in a time of 200 s. The specific heat capacity of the liquid is 4.0 kJ kg–1K–1. What is the average power lost by the liquid?
  
• Who's interested in a new Socratic on a different website?
  
• Balance the chemical equation FeSO4 - Fe2O3+SO2+SO3 ?
  
• If the EPA allowable limit is 30 micrograms per liter how many atoms of uranium are present in 1 L?
  
• A #5 L# container holds #9 # mol and #12 # mol of gasses A and B, respectively. Every three of molecules of gas B bind to two molecule of gas A and the reaction changes the temperature from #320^oK# to #210 ^oK#. By how much does the pressure change?
  
• One of the compound below is called a refractory material? A. CaO B. CuO C. ZnO D. PbO
  
• The rate constant of a reaction at 32°C is measured to be #"0.055 s"^(-1)#. If the frequency factor is #1.2xx10^13s^-1#, what is the activation barrier?
  
• An object travels North at # 8 m/s# for #3 s# and then travels South at # 7 m/s# for # 8 s#. What are the object's average speed and velocity?
  
• Why does oxygen form an #O^(2-)# ion and not an #O^(3-)# ion?
  
• You deposit $200 in a savings account.for each year thereafter , you plan to deposit 15% more than the previous year . About how much money will you have deposited in all after 20 years?
  
• How many liters of a .500M #H_2SO_4# must react with excess #Cu# to produce 15.0 g #CuSO_4#?
  
• A yo-yo is made of 3 disks (same material) and the inner one is 3times smaller than the two outer ones (R/r=3). A string (small thickness) is wrapped around the center disk. What will its acceleration be equal to?
  
• Calculate the potential E for the Fe3+/Fe2+ electrode when the concentration of Fe2+ is exactly five times that of Fe3+?
  
• Question #48f53
  
• Question #2eafd
  
• A solution contains #[OH^-] = 4.0 times 10^-5# #M#, what is the concentration of #[H_3O^+]#?
  
• Identify the equation for which #K_c = ["Ni"^(3+)]["Cl"^-]^3#.?
  
• How do you graph and list the amplitude, period, phase shift for #y=sin((2pi)/3(x-1/2))#?
  
• What is the weight in grams of silver displaced by 0.1 mole of magnesium?
  
• What is the standard form of #y= (2x+4)^2-(x-7)^2 #?
  
• 0.1 mole of #N_2O_4(g)# was sealed in a tube under one-atmosphere conditions at #25^o#C. Calculate the number of moles of #NO_2(g)# present, if the equilibrium #N_2O_4(g) -> 2NO_2(g)# #(K_p = 0.16)# is reached after some time?
  
• The minimum energy needed to dissociate iodine molecules, I2, is 151 kJ/mol. What is the wavelength of photons (in nm) that supplies this energy, assuming each bond dissociated by absorbing one photon?
  
• A wire has a resistance of 100 ohms. It is compressed to half of its original length keeping volume same then what will be its new resistance in ohm?
  
• What is the final equilibrium temperature when 20.00 grams of ice at -15.0°C is mixed with 5.000 grams of steam at 120.0°C?
  
• Titration problem?
  
• When 168 joules of heat is added 4 grams of water at 283 K, what is the resulting temperature?
  
• How do you calculate the equilibrium concentration of #H_3O+# in a 0.20 M solution of oxalic acid?
  
• Define auto redox reaction. Balance the following equation by ion-electron or oxidation number method: #"K"_2"Cr"_2"O"_7(aq) + "FeSO"_4(aq) + "H"_2"SO"_4(aq) -> "K"_2"SO"_4(aq) + "Cr"_2("SO"_4)_3(s) + "Fe"_2("SO"_4)_3(s) + "H"_2"O"(l)#?
  
• The method of bleaching paper pulp with chlorine is replaced by a green chemical method using non toxic chemicals. Chlorine is highly oxidizing, producing toxic by products such as furans and dioxins in organic chemicals. find a), b) and c)?
  
• Complete the following reaction? #"C"_2"H"_5"COOH"+"C"_2"H"_5"OH"->#
  
• How do you calculate the standard cell potential of a cell constructed from #Mg^(2+)#/#Mg# and#Ni^(2+)#/#Ni#. Which half-cell is the anode and which half-cell is the cathode?
  
• What is the number of pi bonds in the molecule below?
  
• The formula for the oxalate ion is #C_2O_4^(2-)#. What would you predict the formula for oxalic acid to be?
  
• Thoughts on the recent announcement made about the future of the Socratic website? Share them here!
  
• Calculate #E_("cell")# for this reaction when [#H^+#] = 4.5 M and [#HSO_4^-#] = 4.5 M, if #E°_("cell")# = 2.04 V?
  
• Total electrons with quantum number n=4 l=1 s=-1/2?
  
• How do you write an equation of a circle that passes through the points (3,6), (-1,-2), and (6,5)?
  
• 11. An electron jumps from 3rd orbit to 1st orbit in H-atom. Find out the wavelength of emitted radiations?
  
• Question #b451c
  
• Can anyone help?
  
• Calculate the % w/v NaOCl in the sample of bleach ??
  
• Fill The ICE table, calculate the concentration of each gas, write Kc expression..?
  
• How would the equilibrium concentration of #H_2O# be affected by removing #H_2# from the mixture?