In addition to covalent and ionic bonds, which of the following interactions are important in biological systems?
a. van der Waals interactions
b. Hydrogen bonds
c. Hydrophobic interactions
d. Both a and b
e. All of the above
Answer: E
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Small Molecules and the Chemistry of Life
- One mole of a substance contains 6.02 × 1023 molecules. This number is known as _______.
- The amount of heat needed to raise one gram of a substance 1°C is known as _______.
- The water strider skates along the surface of water due to a property of liquids called _______.
- In the equation C6H12O6 ? 6CO2 + 6H2O, C6H12O6 is the _______.
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- The molecular weight of glucose (C6H12O6) is _______.
- A _______ is two or more atoms linked by chemical bonds.
- The tendency of atoms in stable molecules to have eight electrons in their outermost shells is known as the _______.
- ______ occurs when one atom, such as 14C, is transformed into another atom, such as 14N, with an accompanying emission of energy.
- The chemical properties of an element are determined by the number of _______ its atoms contain.
- The sum of the atomic weights in any given molecule is called its _______.
- Every atom except for _______ has one or more neutrons in its nucleus.
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- Carbonic acid and sodium bicarbonate act as buffers in the blood. When a small amount of acid is added to this buffer, the H+ ions are used up as they combine with the bicarbonate ions. When this happens, the pH of the blood
- The optimum pH for growing strawberries is 6.5, whereas the optimum pH for growing blueberries is 4.5. Therefore, the number of hydrogen ions needed to grow strawberries is _______ times the number needed for blueberries.
- Which of the following has the greatest concentration of hydrogen ions?
- The notation [H+] refers to the
- Acid rain is a serious environmental problem. A sample of rainwater collected in the Adirondack Mountains had an H+ concentration of 10-4 mol/L. The pH of this sample was
- The more acidic of two solutions has
- A substance with a pH of 6.0 contains