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Water, pH and Macromolecules

Water, pH and Macromolecules
H2O and CH4 are both examples of

ions
acids
none of these
molecules

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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

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Water, pH and Macromolecules
The elements oxygen, nitrogen, and carbon

can all form covalent bonds with other elements
All of these
contain protons and neutrons in their atomic nuclei
are common elements in the molecules that make up living organisms

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Water, pH and Macromolecules
The strength of an acid depends on

electronegativity
number of protons released
number of double bonds
number of neutrons gain

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Water, pH and Macromolecules
The effectiveness or capacity of a buffer solution can be affected by

concentration of the conjugate base to the weak acid
temperature of buffer components
both (a) and (b)
molar concentration of the buffer components

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Water, pH and Macromolecules
Which of the following acid/base pairs act as natural buffers in living systems?

All of these
Histidine+/histidine
H2CO3/HCO3-
H2PO4-/HPO42-

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