Answers edited by Al E.

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• What property of elements visibly show periodic trends when their values are graphed?
  
• What is an exothermic reaction?
  
• 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 #ae2e8
  
• What is the chemical formula for proteins?
  
• Question #6a8dc
  
• Question #10ba6
  
• Question #fede8
  
• Question #edde8
  
• Question #dea0b
  
• Calculate #DeltaG_f^°# of #CH_4# from the tabulated values?
  
• Question #aea82
  
• Question #7e78b
  
• Which of the following is a redox reaction?
  
• Question #695e1
  
• Question #ff274
  
• Who discovered complementary base pairing?
  
• 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 #460c8
  
• 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 #35eac
  
• Question #c87b5
  
• Question #b9346
  
• How do regulatory proteins interact with dna?
  
• What is the valence electronic configuration of f - Block elements?
  
• If the H3O+ of a solution is 5.62x10-12M, what is the OH of the same solution? Assuming 25 degrees celcuis?
  
• 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?
  
• How many electrons are transferred in the following, unbalanced, redox reaction? Cl2(aq) + Kl(aq) => KCl(aq) + l2(aq)?
  
• Question #8784a
  
• Question #9619f
  
• Question #62563
  
• Question #6e276
  
• What does the atomic mass given on the periodic table represent?
  
• 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 #9930d
  
• What is Rf in chromatography?
  
• How would you describe the shapes and relative energies of the s,p,d, and f atomic orbitals?
  
• Question #b33d8
  
• Question #43bf4
  
• Question #0ba2f
  
• Question #2354f
  
• Rate of consumption of dinitrogenpentoxide is 0.5mol per litre per sec rate of formation of NO2 is ??
  
• Question #e9391
  
• How does chemical polarity affect a chemical bond?
  
• Question #78139
  
• 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 #41629
  
• What are some names for the acid and the base that could be used to make copper sulfate?
  
• Question #f4a59
  
• Question #a20c8
  
• What are the electron configurations of carbon, hydrogen, and oxygen atoms?
  
• Question #cde96
  
• Why is #n-C_10 H_22# boiling point higher than #Br_2# boiling point?
  
• Question #fdc11
  
• When is deviation from the ideal gas law greatest?
  
• How many moles of #Cl# are in #1.2 * 10^24# formula units of magnesium chloride?
  
• How would you use the mass spectrum of rubidium to determine the atomic mass of rubidium?
  
• 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 #0938b
  
• Question #44ec4
  
• 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?
  
• A. Identify the limiting reagent. B. State how many grams of the excess reagent remain. C. State how many grams of product are produced.?
  
• What kind of glycosidic linkages are found in lactose?
  
• How to solve this redox reaction?
  
• I'm confused with this chemistry problem?
  
• Question #32fe8
  
• Question #856f3
  
• Question #b15c6
  
• Question #57d55
  
• 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?
  
• 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 #2f32f
  
• 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?
  
• Why do both atomic size and ionic size increase as you move down a group?
  
• How do you write the noble-gas electron configuration for gold?
  
• Question #fc046
  
• How do you calculate the experimental molality of the methanol solution from the freezing point of the solution?
  
• Question #21d78
  
• Question #53869
  
• Question #827fe
  
• In general at which temperature will dissolve the most substance in water? 0, 60, or 100 degrees C?
  
• 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?
  
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