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Phosphofructokinase is allosterically inhibited by the ATP. But the ATP is also a substrate for the enzyme. Explain how is it possible that the enzyme can function with one of its substrate that is
Find out the molar heat of combustion of caffeine (in kJ) when a 1.05-g sample of caffeine C8H10N4O2 burns in a constant-volume calorimeter that has a heat capacity of 7.85 kJ/K. The temperatur
Calculate the mass percent of acetic acid in the original sample. Assume the density of vinegar is 1.0 g/mL by using the molarity of vinegar (1.103M), which is having the formula for acetic a
Oxygen gas, O2(g) and nitrogen gas, N2(g), are brought together in a vessel and heated to 1200oC. At this temperature they react to produce the nitrogen oxide, NO(g).
The volume of the gas collected was 47.4mL, and the atmospheric pressure in the lab was 744 mm Hg. A sample of magnesium is allowed to react with an excess of hydrochloric acid solution.
Calculate the Made lung constant of the XY crystal structure when the Columbic energy of a single M+_ X- ion pair is 1.0 *10-18 J. The total energy of the ionic crystalline so
Explain what mass of solid aluminum hydroxide can be formed when 50ml of.202 M Al(NO3)3 is added to 200ml of .201 M KOH?
At 200MHz when the 1H NMR spectrum of acetone, CH3COCH3, is recorded on an instrument operating, a single sharp resonance at 2.1δ is seen.
Hexachlorophene, a compound made up of atoms of hydrogen, carbon, oxygen and chlorine, is an ingredient in the germicidal soaps. Combustion of a 1.00g sample yields 0.134g of water and 0.523 g of ch
The product stream is analyzed and found to contain 51.7% C2H5Br and17.3% HBr. The reaction between hydrogen bromide and ethylene to form the ethyl bromide is carried out in a continuous reactor.
Explain what would be the final product of the reaction among the methyl benzoate and two equivalents of theylmagnesium bromide?
Discuss why the C=C stretching mode gives rise to a rather weak IR band in 1-methylcyclohexane, while in its isomer, methylenecyclohexene, the band is of medium to strong intensity.
A value of 0.80 part per million (ppm) is considered to be dangerous. The "normal" lead content in human blood is about 0.40 part per million (that is, 0.40 g of lead per million grams of blood).
The mass of mercury needed to fill the tube is 105,5g if a cylindrical glass tube 12, 7 cm in length is filled with mercury. Determine the inner diameter of the tube when the density of mercu
Describe the numbers of mols and grams of Pb(NO3)2 are in the reaction mixture? Calculate the percent by mass of each salt in the mixture?
Discuss how could you show the presence of both iodide and sulfate in a mixture and why should distilled water be used when making the chemical tests?
Determine the energy of an Avogadro's number of photons (called an Einstein) of this radiation. Microwave radiation has a wavelength on the order of 1.0cm.
Determine the inner diameter of the tube. (The density of mercury = 13,6g/mL) when a cylindrical glass tube 12, 7 cm in length is filled with mercury. The mass of mercury required to fill the tube
Explain what will be the appearance of a TLC plate if a solvent of too low polarity is used for the development? Explain why does the lid of the jar need to be on while developing your TLC plate?
Determine the numbers of milliliters of 53.4 wt% NaOH will you require to prepare 2.000 L of 0.169 M NaOH? Suppose you have a bottle labeled "53.4 (± 0.4) wt% NaOH -density +1.52 (± 0.
Some HBr was admitted into an evacuated 2000cm 3 vessel in an experiment conducted at a fixed temperature and when the equilibrium was attained some had decomposed yielding the 6.32 mol of bromide a
Briefly explain what information is contained in the formula of a compound. Discuss what initial information must be available to determine the empirical formula for a compound?
Does a negative heat capacity make sense? Explain. Heat Capacity is defined as the quantity of heat required to raise the temperature of a body by one degree Celsius.
Magnesium metal reacts with liberating H2 gas, HCl solution and generating the Mg2+ cations in solution. A 2.895-g sample of Mg metal is added to the 100.0 mL of a 4.00 M HCl solution, and
Calculate the partial pressures and the total pressure of the final mixture when a vessel of volume 22.4dm3 contains 2.0 molH2 and 1.0 mol N2 at 273.15 K initially. All the H2 reac