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

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

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

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Water, pH and Macromolecules
Hydrogen bonds and hydrophilic interactions are types of

strong chemical bonds that link together separate molecules
weak chemical bonds that hold together the atoms within a molecule
strong chemical bonds that hold together the atoms within a molecule
weak chemical bonds that link together separate molecules

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

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

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