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

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

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Water, pH and Macromolecules
Which of the following statements about covalently bonded molecules is false?

Noncovalent bonds may also be present, especially if the molecule is large
The chemical bonds that hold the molecule together are relatively strong
Such molecules often result from the interaction of ionized atoms
Electrons are shared between the atoms that make up the molecule

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Water, pH and Macromolecules
Buffer solutions

tend to maintain a relatively constant pH.
will always have a pH of 7
cause a decrease in pH when acids are added to them.
are rarely found in living systems

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Water, pH and Macromolecules
Which of the following statements about water is correct?

It is critical for many of the chemical processes found in living systems
Polar substances that can form hydrogen bonds will dissolve in it
Nonpolar substances like oils are not soluble in it
All of these

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