Answers edited by Al E.

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• Question #b33d8
  
• 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 valence electronic configuration of f - Block elements?
  
• 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?
  
• Question #0ba2f
  
• What are some names for the acid and the base that could be used to make copper sulfate?
  
• Question #53869
  
• How do regulatory proteins interact with dna?
  
• 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?
  
• What property of elements visibly show periodic trends when their values are graphed?
  
• Question #ff274
  
• How does chemical polarity affect a chemical bond?
  
• Question #0938b
  
• How do you calculate the experimental molality of the methanol solution from the freezing point of the solution?
  
• Question #aea82
  
• Question #fc046
  
• Question #61c84
  
• 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 #b9346
  
• Question #c87b5
  
• Question #44ec4
  
• 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?
  
• What kind of glycosidic linkages are found in lactose?
  
• 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 #6a8dc
  
• 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?
  
• How many moles of #Cl# are in #1.2 * 10^24# formula units of magnesium chloride?
  
• Rate of consumption of dinitrogenpentoxide is 0.5mol per litre per sec rate of formation of NO2 is ??
  
• Question #fede8
  
• What does the atomic mass given on the periodic table represent?
  
• In general at which temperature will dissolve the most substance in water? 0, 60, or 100 degrees C?
  
• Question #ae2e8
  
• What is an exothermic reaction?
  
• 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
  
• Question #41629
  
• 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 #e9391
  
• Question #9930d
  
• How many electrons are transferred in the following, unbalanced, redox reaction? Cl2(aq) + Kl(aq) => KCl(aq) + l2(aq)?
  
• How would you use the mass spectrum of rubidium to determine the atomic mass of rubidium?
  
• Question #78139
  
• A. Identify the limiting reagent. B. State how many grams of the excess reagent remain. C. State how many grams of product are produced.?
  
• Calculate #DeltaG_f^°# of #CH_4# from the tabulated values?
  
• Question #9619f
  
• Question #dea0b
  
• Question #35eac
  
• Question #a20c8
  
• What is the chemical formula for proteins?
  
• Question #6e276
  
• 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?
  
• Why do both atomic size and ionic size increase as you move down a group?
  
• Question #8784a
  
• Question #827fe
  
• 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?
  
• I'm confused with this chemistry problem?
  
• Question #57d55
  
• Why is #n-C_10 H_22# boiling point higher than #Br_2# boiling point?
  
• Question #460c8
  
• Question #856f3
  
• Question #7e78b
  
• Question #43bf4
  
• Question #32fe8
  
• Question #2354f
  
• What are the electron configurations of carbon, hydrogen, and oxygen atoms?
  
• Who discovered complementary base pairing?
  
• Question #2f32f
  
• Question #f4a59
  
• 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 #62563
  
• Question #fdc11
  
• Question #cde96
  
• Question #21d78
  
• How would you describe the shapes and relative energies of the s,p,d, and f atomic orbitals?
  
• Question #10ba6
  
• Question #edde8
  
• How do you write the noble-gas electron configuration for gold?
  
• What is Rf in chromatography?
  
• When is deviation from the ideal gas law greatest?
  
• Question #695e1
  
• How to solve this redox reaction?
  
• Which of the following is a redox reaction?
  
• Question #b15c6
  
• 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?
  
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