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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
A Bronsted acid becomes __________ upon losing a proton.

its conjugate base
highly reactive
its conjugate acid
a hydronium ion

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

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

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Water, pH and Macromolecules
The lone pair electrons on oxygen in a H20 molecule

are not important for the properties of water
carry a partial negative charge
carry a partial positive charge
form covalent bonds in ice

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

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

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Water, pH and Macromolecules
A solution with pH = 5 is __________ than a solution with pH = 7.

10 times more acidic
2 times more basic
100 times more acidic
10 times more basic

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