Answers created by Jacob T.

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• It takes 78.2 J to raise the temperature of 45.6 grams of lead by 13.3 C. What is the specific heat of lead?
  
• An object with a mass of #7 kg# is on a ramp at an incline of #pi/4 #. If the object is being pushed up the ramp with a force of # 8 N#, what is the minimum coefficient of static friction needed for the object to remain put?
  
• Can you write the nuclear equation for the decay of potassium-42?
  
• Calculate the potential E for the Fe3+/Fe2+ electrode when the concentration of Fe2+ is exactly five times that of Fe3+?
  
• I don't know how to approach this question? I need help
  
• 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?
  
• How do you write an ionic equation for the following reaction? A student repeats the experiment with copper instead of magnesium. State whether a reaction would still occur. Why or why not?
  
• Chemistry help?
  
• Can anyone help?
  
• How do you solve for k using the Arrhenius Equation? A first order reaction has an activation energy of #"E"_a = "65.7 kJ/mol"# and a frequency factor (pre-exponential factor, #"A"#) of #1.31 xx 10^12 "s"^(-1)#. Calculate the rate constant at #19^@ "C"#.
  
• 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?
  
• What are the three substances that are produced when water molecules are broken down during the light reactions?
  
• What are the equations that describes the reaction of Cu and HNO3?
  
• What are the extrema of #f(x)=5x^2+4x-3# on #[-oo,oo]#?
  
• What is a use of sulphur dioxide and magnesium oxide? Relate both to its properties.
  
• How would you balance #"H"_3"BO"_3"##rarr##"H"_4"B"_6"O"_11" +H"_2"O"#?
  
• Fill The ICE table, calculate the concentration of each gas, write Kc expression..?
  
• How do you graph #f(x)=2/(x-1)# using holes, vertical and horizontal asymptotes, x and y intercepts?
  
• Calculate #E_("cell")# for this reaction when [#H^+#] = 4.5 M and [#HSO_4^-#] = 4.5 M, if #E°_("cell")# = 2.04 V?
  
• What happens to the configuration of the alkile halides in the SN2 mechanism?what does it mean "configuration"?
  
• Why does CS2 have higher boiling point than OCS (C as central atom)?
  
• What is the decomposition of hydrogen peroxide to generate oxygen?
  
• What are the atomic number and atomic mass of the element formed when 218Po emits a beta particle? What are they if the polonium emits an alpha particle?
  
• 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?
  
• A rock of mass 350g is thrown upwards with in initial speed of 22m/s. What is the maximum height point it will reach?
  
• 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 #Na_2S# is added to a solution containing #AgCl#, a black precipitate of #Ag_2S# forms. Why does this happen using Le Chateliers's principle?
  
• Analysis of gaseous bromine vapourised in a mass spectrometer shows that it consists of 51% of Br-79 and 49% of Br-81...?
  
• How do pi bonds overlap?
  
• A) Calculate the wavelength (in #nm#) of light with energy #1.63*10^-20# J per photon? b)For light of wavelength #410 nm#, calculate the number of photons per joule?
  
• A chemical reaction has #\ \ DeltaH^{circ}=-5.8\ text{kJmol}^{-1]\ \ # and an equilibrium constant of #\ \ 2.1\ \ # at #\ \ T=298\ K.\ \ #...?
  
• How do you calculate the equilibrium concentration of #H_3O+# in a 0.20 M solution of oxalic acid?
  
• Elemental S reacts with O2 to form SO3 according to the reaction 2S+3O2→2SO3 Part B: What is the theoretical yield of SO3 produced by the quantities described in Part A? Express your answer numerically in grams.
  
• A mix of oxide and peroxide of the same monovalent metal has the mass of 5.6g.The mix is treated with an excess amount of water , forming 6.4g of base. (?)
  
• What is the relation between #t_(1//2)# and #t_(3//4)# in first order reaction?
  
• 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?
  
• How many liters of a .500M #H_2SO_4# must react with excess #Cu# to produce 15.0 g #CuSO_4#?
  
• What is the energy released by 20 grams of 100°C steam that condenses and then cools to 0°C?
  
• The structure of linalool, a compound with a floral scent used in perfumes, How many pi bonds are shown in the structure?
  
• All the salts below will be neutral to litmus paper when dissolved in water except? A. CuCl2 B. NaCl C. KCl D. Na2So4
  
• One of the compound below is called a refractory material? A. CaO B. CuO C. ZnO D. PbO
  
• 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?
  
• How would the equilibrium concentration of #H_2O# be affected by removing #H_2# from the mixture?
  
• What is the pH if 50.0 mL of 0.100 M HCN is mixed with 100.0 mL of 0.100 M NaOH?
  
• What happens to a neutral nonmetal atom in order for the octet rule to be satisfied?
  
• How would you identify the period, block and group of the element with the electron configuration #[Ar]3d^7 4s^2#?
  
• 500.0 L of gas are prepared at 0.921 atm pressure and 200.0°C. The gas is placed into a tank under high pressure. When the tank cools to 20.0°C, the pressure is 30.0 atm. What is the volume of the gas under these conditions?
  
• 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?
  
• What important characteristic do the alkali metals alkaline earth metals have in common?
  
• Who's interested in a new Socratic on a different website?
  
• 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
  
• Calculate the % w/v NaOCl in the sample of bleach ??
  
• For a single ionized helium atom ,the longest wavelength in ground state absorb will be?
  
• What is the theoretical yield (in grams) of Fe(OH)3 in the reaction below when 5.00 mL of 0.150 M FeCl3 are reacted with 6.00 mL of 0.200 M NaOH?
  
• What is the standard state free energy for this reaction?
  
• What is the basicity of ethanoic ("acetic") acid #"CH"_3"COOH"# ?
  
• What amount of #Zn# will be required to produce #H_2# by its action on dilute #H_2SO_4# which will completely react with the oxygen, produced by heating #30g# of #KClO_3#?
  
• 11. An electron jumps from 3rd orbit to 1st orbit in H-atom. Find out the wavelength of emitted radiations?
  
• How would you rank these ions according to atomic radius: #K^+#, #Ca^+2#, #P^-3#, #S^-2#, #Cl^-# (from smallest to largest)? Please explain why you chose this order.
  
• Titration problem?
  
• 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?
  
• An element with mass 130 grams decays by 22% per minute. How much of the the element is remaining after 7 minutes, to the nearest 10th of a gram?
  
• What is the chemical equation for the reaction of Lead with copper (II) chloride?
  
• 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?
  
• 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?
  
• Identify the compound x on the basis of the reaction given below. also write the name and chemical formula of A,B,C X.............+Zn...........=A+H2 X.............+HCL ..........=B+H2O X..............+CH3COOH........=C+H2O ???????????
  
• 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?
  
• 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)?
  
• What is the angular displacement by minute's hand of a clock after 5 minutes?
  
• Superman jumped off the ground and accelerated his #120# #kg# frame at a rate of #30# #m##/s^2#. What was the force that was the Superman applied to the ground as he jumped?
  
• An iron nail was immersed in a solution of copper sulfate and when it was removed from the solution, it was coated with a layer of copper metal. Hereafter, a different iron nail was immersed in a solution of zinc nitrate and removed this nail rusted?(con)
  
• How do you graph #f(x)=1/x-3x^3# using the information given by the first derivative?
  
• Is precipitation always involved in a double displacement reaction?
  
• Why does oxygen form an #O^(2-)# ion and not an #O^(3-)# ion?
  
• A major department store has just installed three new escalators. Each one is designed to carry 120 people, each of average mass 70kg. per min to a floor 10.0m higher. The engine which drives these escalators is 65% energy efficient. What?
  
• What are physical properties that can separate a mixture?
  
• What are the quantum numbers of the seventh electron in fluorine?
  
• Calculate the mole of carbon dioxide when 11.2L of methane atSTP is ignited in excess of air?please explain?
  
• E.M.F of cell Ni|Ni+2(0.1)||Au+3(1.0)|Au is ...,if E° for Ni+2|Ni is -0.25V,E° for Au+3|Au is 1.50V ?
  
• Fill in the blank in each of the following nuclear equations. You will need to enter either a form of radiation or an isotope. If it is the latter, you must fully identify the isotope in superscript/subscript notation?
  
• Under certain conditions of temperature and pressure, hydrogen gas and nitrogen gas react to form ammonia gas. Determine the mass of ammonia produced if 3.50 moles of hydrogen has reacts with 5.00 moles of nitrogen gas?
  
• An iron nail with a mass of 1.365 g is soaked in an acidic solution, yielding Fe2+ solution, which is then titrated with 26.48 mL of KMnO4 solution in the following equation: Calculate the molar concentration of the KMnO4 solution?
  
• Balance the chemical equation FeSO4 - Fe2O3+SO2+SO3 ?
  
• 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?
  
• 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?
  
• Why is BCl3 a Lewis acid?
  
• Some help please question is below as a image thank you? #"HNO"_3# is a strong acid. [What is] the #"pH"# of a #0.54color(white)(l)"mol"*"dm"^(-3)# solution?
  
• How does the reaction of Sodium hydrogencarbonate and hydrochloric acid support the theory of conservation of mass?
  
• Complete the following reaction? #"C"_2"H"_5"COOH"+"C"_2"H"_5"OH"->#
  
• Using the molecular dipoles/polarity of #H_2O#, #NH_3#, and #CH_4#, how do you explain why does #CH_4# does not mix with #H_2O#?
  
• How to Calculate the decay constant, half-life and the mean life for a radioisotope which activity is found to decrease by 25% in one week??
  
• Is liquid soluble sucrose an electrical conductor?
  
• Find maxima and minima of f(x)= 5sinx + 5cosx on a interval of [0,2pi]?
  
• A ball has a kinetic energy of 100 J. What would be the kinetic energy of a ball with twice the mass and half the momentum?
  
• How do you find dy/dx by implicit differentiation for #1+x = sin(xy^2)#?
  
• Total electrons with quantum number n=4 l=1 s=-1/2?
  
• A first order reaction take 100 minutes for completion of 60 Decomposition of 60% of reaction find the time when 90% of reaction complete?
  
• 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?
  
• What is the name of #Pb(OH)_2#?
  
• 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?
  
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