Answers edited by Al E.

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• Question #fdc11
  
• The concentration of the appetite-regulating hormone #1.3 times 10^-10# #M# in a fasting person. How many molecules of ghrelin are in 1 L of blood?
  
• Hydrosulfuric acid, H2S, has two acid ionization constants. What is the equation that corresponds to the Ka value of Ka = 8.9 × 10^−8? and include states of matter in the answer
  
• What is Rf in chromatography?
  
• Question #b15c6
  
• Question #856f3
  
• What is the density in g/cm^3 of an iron ball that has a radius of 45.0 mm, and a mass of 300 g?
  
• Question #cde96
  
• Question #44ec4
  
• What is the valence electronic configuration of f - Block elements?
  
• Question #a20c8
  
• Question #ff274
  
• Question #b33d8
  
• What is the specific heat of an unknown substance if 2000 J energy are required to raise the temperature of 4 grams of the substance 5°C?
  
• A mutation occurred in the middle of a DNA sequence from the coding strand as shown by the partial sequence below. Determine the molecular impact of this mutation and explain the possible effects resulting from this mutation. Please be specific on this?
  
• Question #7e78b
  
• Question #b9346
  
• In general at which temperature will dissolve the most substance in water? 0, 60, or 100 degrees C?
  
• When is deviation from the ideal gas law greatest?
  
• Who discovered complementary base pairing?
  
• Question #f4a59
  
• Why do both atomic size and ionic size increase as you move down a group?
  
• Question #460c8
  
• Question #0ba2f
  
• A sample of hydrogen gas is collected and found to fill 2.85 Lat 25.0°C. What will be its volume at exactly 0°C?
  
• Question #10ba6
  
• Why is #n-C_10 H_22# boiling point higher than #Br_2# boiling point?
  
• Question #695e1
  
• What property of elements visibly show periodic trends when their values are graphed?
  
• Question #62563
  
• Question #43bf4
  
• Question #c87b5
  
• Question #2f32f
  
• How would you describe the shapes and relative energies of the s,p,d, and f atomic orbitals?
  
• Which sample is most likely to undergo the smallest change in temperature upon the absorption of 100 kj of heat? A.15g of water B.15g of lead C.50g of water D.50g of lead Why water?
  
• Question #aea82
  
• Question #ae2e8
  
• Question #0938b
  
• I'm confused with this chemistry problem?
  
• How many electrons are transferred in the following, unbalanced, redox reaction? Cl2(aq) + Kl(aq) => KCl(aq) + l2(aq)?
  
• Question #41629
  
• Question #8784a
  
• Question #6e276
  
• A first-order reaction has a hall-life of 21.3s. How long does it take for the concentration of the reactant in the reaction to fall to one-eighth of its initial value?
  
• Question #fede8
  
• Question #fc046
  
• Question #6a8dc
  
• What are the electron configurations of carbon, hydrogen, and oxygen atoms?
  
• Question #2354f
  
• If the H3O+ of a solution is 5.62x10-12M, what is the OH of the same solution? Assuming 25 degrees celcuis?
  
• What is the chemical formula for proteins?
  
• Question #9619f
  
• Question #78139
  
• The average osmotic pressure of human blood is 7.8bar at 310K.What is the concentration of an aqueous NaCl solution that could be used in the blood stream?
  
• Question #21d78
  
• Which of the following is a redox reaction?
  
• How do you calculate the experimental molality of the methanol solution from the freezing point of the solution?
  
• How does chemical polarity affect a chemical bond?
  
• What is an exothermic reaction?
  
• Question #32fe8
  
• Question #dea0b
  
• How to solve this redox reaction?
  
• Question #827fe
  
• What are some names for the acid and the base that could be used to make copper sulfate?
  
• How would you use the mass spectrum of rubidium to determine the atomic mass of rubidium?
  
• The valence electron in potassium requires #6.95 xx 10^-19# #"J"# of energy to be removed. What frequency of light can do this? What type of electromagnetic radiation could do this?
  
• How do you write the noble-gas electron configuration for gold?
  
• Rate of consumption of dinitrogenpentoxide is 0.5mol per litre per sec rate of formation of NO2 is ??
  
• How many moles of #Cl# are in #1.2 * 10^24# formula units of magnesium chloride?
  
• Question #57d55
  
• What kind of glycosidic linkages are found in lactose?
  
• Question #9930d
  
• How do regulatory proteins interact with dna?
  
• What does the atomic mass given on the periodic table represent?
  
• Calculate #DeltaG_f^°# of #CH_4# from the tabulated values?
  
• Question #35eac
  
• Question #e9391
  
• A. Identify the limiting reagent. B. State how many grams of the excess reagent remain. C. State how many grams of product are produced.?
  
• Magnesium reacts with hydrochloric acid according to the following equation: #Mg(s) + 2HCl(aq) -> MgCl_2(aq) +H_2(g)#. What mass of hydrogen will be obtained if 100 #cm^3# of 2.00 mol #dm^-3# HCl are added to 4.86 g of magnesium?
  
• Question #61c84
  
• A patient recieves 9.0 ng of a radioisotope with a half-live of 12 hours. How much will remain in the body (in ng) after 2.0 days?
  
• Question #53869
  
• Question #edde8
  
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