Water, pH and Macromolecules
A compound that is capable of forming hydrogen bonds with water

does not dissolve well in water
is probably held together by noncovalent bonds
contains at least some polar covalent bonds
should act as a good buffer for acids and bases

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

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

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Water, pH and Macromolecules
Which of the following character does not apply to water?

The water molecule readily forms hydrophobic interactions
The covalent bonds in water are highly polarized
All three atoms in the water molecule readily form hydrogen bonds
The water molecule is asymmetric

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Water, pH and Macromolecules
Salt dissolves well in water as water molecules

make nonpolar covalent bonds with the positively charged ions only
share electrons with the ions to make polar covalent bonds
form hydrogen bonds with the positively and negatively charged ions
surround the ions because of their charge but do not form hydrogen bonds

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