Water, pH and Macromolecules Which of the following acid/base pairs act as natural buffers in living systems? H2CO3/HCO3- Histidine+/histidine All of these H2PO4-/HPO42- H2CO3/HCO3- Histidine+/histidine All of these H2PO4-/HPO42- ANSWER DOWNLOAD EXAMIANS APP
Water, pH and Macromolecules Which of the following will easily dissolve in a polar solvent? gasoline (heptanes & octanes) sodium chloride methane argon gasoline (heptanes & octanes) sodium chloride methane argon ANSWER DOWNLOAD EXAMIANS APP
Water, pH and Macromolecules What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7? 5 x 10-7 7 7 x 10-7 1 x 10-7 5 x 10-7 7 7 x 10-7 1 x 10-7 ANSWER DOWNLOAD EXAMIANS APP
Water, pH and Macromolecules The effectiveness or capacity of a buffer solution can be affected by both (a) and (b) temperature of buffer components molar concentration of the buffer components concentration of the conjugate base to the weak acid both (a) and (b) temperature of buffer components molar concentration of the buffer components concentration of the conjugate base to the weak acid ANSWER DOWNLOAD EXAMIANS APP
Water, pH and Macromolecules Hydrogen bonds and hydrophilic interactions are types of strong chemical bonds that link together separate molecules weak chemical bonds that link together separate molecules weak chemical bonds that hold together the atoms within a molecule strong chemical bonds that hold together the atoms within a molecule strong chemical bonds that link together separate molecules weak chemical bonds that link together separate molecules weak chemical bonds that hold together the atoms within a molecule strong chemical bonds that hold together the atoms within a molecule ANSWER DOWNLOAD EXAMIANS APP
Water, pH and Macromolecules Polyprotic acids such as H3PO4, can act as acid-base buffers if their concentration is kept low at pH values around any of their pKa's only in combination with polyprotic bases at pH values around neutrality if their concentration is kept low at pH values around any of their pKa's only in combination with polyprotic bases at pH values around neutrality ANSWER DOWNLOAD EXAMIANS APP
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