Part A Match the spheres represented with atoms of K, Ge, Ca, and Kr. Drag the appropriate labels to their respective targets. Reset Help K Ca Ge Kr
Q: Electrons (me = 9.10938 × 10-28 g) moving at 1.80x107 m/s in an electron microscope: m
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A: Refractometer is used to measure the refractive index of liquid.
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A: The uncertainty principle was given by Werner Heisenberg.
Q: s) +2C1,(g) – SnCI,0) AHin = -511.3 kJ/mol -2.45 Incorrect (g) + C,(g) → 2 HCI(g) AHin = -184.6…
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A: Given, Pb(NO3)2(aq) + 2KI(aq) ➡ 2KNO3(aq) + PbI2(s) Pb(NO3)2 and KI both are soluble in aqueous…
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A: Isotope : Element with same atomic no. but having different no. of neutrons.
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A: The line spectra's given are,
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A: The given question's answer will be option b)Protons and neutrons have nearly the same mass.
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A: We know that 100 cm = 1 m So devide by 100 in wavelength in cm.
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A: The electronic configuration of noble gas = ns2np6
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Q: Draw a concentric circular diagram showing energy levels from 1-3. Then illustrate which “sublevels”…
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Q: bottom
A: According to the question, the chemical reaction is given as: 2A(g) + 3B(s) ----> C(g)…
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- Green Chemistry and Atom Economy The purposeful design of chemical products and processes that minimize the use of environmentally hazardous substances and the generation of waste is known as green chemistry. Green chemistry is a philosophical approach that is being applied to many areas of science and technology, and its practice is summarized by guidelines known as the “Twelve Principles of Green Chemistry” (see details at this website (http://openstaxcollege.org/l/16greenchem) ). One of the 12 principles is aimed specifically at maximizing the efficiency of processes for synthesizing chemical products. The atom economy of a process is a measureof this efficiency, defined as the percentage by mass of the final product of a synthesis relative to the masses of all the reactants used: atom economy = mass of product/mass of reactants × 100%Though the definition of atom economy at first glance appears very similar to that for percent yield, be aware that this property represents a…Green Chemistry and Atom Economy The purposeful design of chemical products and processes that minimize the use of environmentally hazardous substances and the generation of waste is known as green chemistry. Green chemistry is a philosophical approach that is being applied to many areas of science and technology, and its practice is summarized by guidelines known as the “Twelve Principles of Green Chemistry” (see details at this website (http://openstaxcollege.org/l/16greenchem) ). One of the 12 principles is aimed specifically at maximizing the efficiency of processes for synthesizing chemical products. The atom economy of a process is a measureof this efficiency, defined as the percentage by mass of the final product of a synthesis relative to the masses of all the reactants used: atom economy = mass of product/mass of reactants × 100%Though the definition of atom economy at first glance appears very similar to that for percent yield, be aware that this property represents a…Which of the following processes has ΔS<0? Select one: C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g) 1.0 L of He(g) is compressed to 500 mL. Milk is added to a cup of coffee. H2O(s) → H2O(l) CaCl2(s) → Ca2+(aq) + 2Cl–(aq)
- A student obtains the following data by following an experimental procedure to this one. Based on this data, what is the value of R (in L.atm/mol/K) that would be calculated? Report the result to four significant figures. Use 273.15 K for the temperature conversion. Pressure of dry H2 = 742.0 mm Hg Temperature = 22.00 degrees C Mass of Mg used = 0.03860 g Volume of H2 = 44.10 ET units Conversion factor = 0.8119 mL/ET UnitAt an altitude of 11,000 m (a typical cruising altitude for a jet airliner), the air temperature is -50.0 ∘C and the air density is 0.303 kg/m3. The molar mass of air is 28.8 g/mol. What is the pressure of the atmosphere at that altitude? (Note: The temperature at this altitude is not the same as at the surface of the earth, so the equation P=P0exp(−MgyRT)P=P0exp(−MgyRT) doesn't apply.) Express your answer with the appropriate units.When nitric acid reacts with hydrazine (i.e. dinitrogen tetrahydride), nitrogen gas and water are formed. The temperature is constant at 25°C.4 HNO3(aq) + 5 N2H4(l) " 7 N2(g) + 12 H2O(l)Substance ΔHf° (kJ/mol) S° (kJ/mol K)HNO3 (aq) –133.9 0.2669H2O (l) –285.8 0.0700N2 (g) 0 0.1916N2H4 (l) +50.6 0.1212a. Calculate ΔH° (in kJ/mol) and ΔS° (in kJ/mol K).b. Calculate ΔG° (in kJ/mol).c. Determine K for this reaction.
- A mixture of propane and methane occupied 122 mL at 25⁰C and 1.0 atm. This mixture was totally burned in excess O2 to produce CO2(g) and H2O(g). The mass of the CO2 produced was 0.506 g. What is the mass % composition of the original mixture? Show all work.Use the molar DHf° under the formulas to calculate DH°rxn for the equations as balanced: 1. 2B2H6(g) + 3CO2(g) --> 2B2O3(s) + 3CH4(g) ΔH°rxn = _______ kJ ΔH°f = +36 –394 –1274 –75 kJ/mol exo ? endo_thermic 2. 2P2O5 + 2CaC2 -->P4 + 2CaCO3 + 2CO2 ΔH°rxn = _______ kJ ΔH°f = –1505 –59 ___ –1207 –394 kJ/mol exo ? endo_thermic 3. 2Na2CrO4(s) + 10HCl(g) --> 4NaCl(s) + 3Cl2(g) + Cr2O3(s) + 5H2O(l) ΔH°f = –1342 –92 –411 ___ –1140 –286 kJ/mol ΔH°rxn = _______ kJ exo ? endo_thermicConsider the complete combustion of glucose (C6H12O6) with O2 and calculate the moles of CO2produced when 1.02 g of glucose is reacted with 25 mL of O2 at body temperature (37 ºC) and 0.970 atm. C6H12O6 + 6 O2 (g) → 6 CO2 (g) + 6 H2O a. 0.95 b. 0.0022 c. 9.53 x 10-4 d. 6.33 x 10-2 e. 5.67 x 10-3
- An ideal gas confined to a container with a massless piston at the top. A massless wire is attacted to the piston. When an external pressure of 2.00 atm is applied to the wire, the gas compresses from 4.90 to 2.45L. When the external pressure is increased to 2.50 atm, the gas futher compresses from 2.45 to 1.96L In a seperate experiment with the same initial conditions of 2.50 atm was applied to the ideal gas, decreasing its volume from 4.90 to 1.96L in one step. If the final temperture was the same for both processes, what is the difference between q for the two step pocess and q for the one process in joules?An aqueous waste stream with a maximum concentration of 0.50 M H2SO4 (d = 1.030 g/mL at 25oC) is neutralized by controlled addition of 40% NaOH (d = 1.430 g/L) before it goes to the process sewer and then to the chemical plant waste treatment facility. A safety review finds that the waste stream could meet a small stream of an immiscible organic compound, which could form a flammable vapor in air at 40.oC. The maximum temperature reached by the NaOH solution and the waste stream is 31oC. Could the temperature increase due to the heat transferred by the neutralization cause the organic vapor to explode? Assume that the specific heat capacity of each solution is 4.184 J/g*K.Subject: Physical Chemistry you are a food specialist in a company that specializes in refrigerated delicacies, and one of your brands requires being maintained at a temperature of 5°C. You determine average water activity (aw) at this temperature to be 0.2. One day, you are informed that the cooling systems on one of the delivery trucks carrying your company’s products malfunctioned while en route to its destination and it would not be fixed until the next delivery. The driver has informed you that the temperature in the delivery bay of the truck is averaging 55°C. You estimate a heat of sorption (Q) of 19 kJ/mol. Calculate the water activity of the brand at this elevated temperature and comment on it’s integrity. Should the delivery still push through? Or should the products be recalled and disposed