21. A solution with pH = 5 is __________ than a solution with pH = 7.
A. 2 times more basic
B. 10 times more basic
C. 10 times more acidic
D. 100 times more acidic
22. The lone pair electrons on oxygen in a H20 molecule
A. carry a partial positive charge
B. are not important for the properties of water
C. carry a partial negative charge
D. form covalent bonds in ice
23. Which of the following statements about water is correct?
A. It is critical for many of the chemical processes found in living systems
B. Polar substances that can form hydrogen bonds will dissolve in it
C. Nonpolar substances like oils are not soluble in it
D. All of the above
24. The strength of an acid depends on
A. number of neutrons gain
B. electronegativity
C. number of double bonds
D. number of protons released
25. Which of the following statements about covalently bonded molecules is false?
A. Electrons are shared between the atoms that make up the molecule
B. Noncovalent bonds may also be present, especially if the molecule is large
C. Such molecules often result from the interaction of ionized atoms
D. The chemical bonds that hold the molecule together are relatively strong
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