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

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

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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
All of these
Polar substances that can form hydrogen bonds will dissolve in it
Nonpolar substances like oils are not soluble in it

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Water, pH and Macromolecules
The main difference between an acid and a base is that

bases donate hydrogen ions in water while acids accept hydrogen ions
acids donate hydrogen ions in water while bases accept hydrogen ions
acids are polar molecules and bases are not
bases are polar molecules and acids are not

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