Chapter 2: The Chemistry of Life

Front

What property of a water molecule allows hydrogen bonds to form among adjacent molecules?

Back

The polarity of the molecule, which involves a slightly negative oxygen atom and slightly positive hydrogen atoms.

Front

What is the function of lipids in forming a waterproof covering on feathers, leaves, and fruits?

Back

Lipids provide a waterproof barrier that prevents water loss and protects organisms from environmental factors.

Front

How does carbonic anhydrase affect the reaction between carbon dioxide and water?

Back

It decreases the activation energy, making the reaction occur more quickly.

Front

How do the properties of sodium chloride compare with those of sodium and chlorine?

Back

Sodium chloride has very different properties compared to its constituent elements.

Front

What conclusion can be drawn about the polarity of lipid molecules based on their interaction with water?

Back

Lipid molecules are nonpolar because they repel water molecules, which are polar.

Front

Define polarity in the context of molecules.

Back

Polarity refers to the distribution of electrical charge over the atoms joined by the bond, leading to a molecule having a positive and a negative end.

Front

What is the role of hydrogen bonds in water's unique properties?

Back

Hydrogen bonds contribute to water's high surface tension, specific heat, and solvent capabilities.

Front

Explain the significance of activation energy in chemical reactions.

Back

Activation energy is the minimum energy required for a chemical reaction to occur, influencing the rate of the reaction.

Front

What are lipids, and what are their primary functions in living organisms?

Back

Lipids are organic compounds that are hydrophobic and serve functions such as energy storage, insulation, and forming cell membranes.

Front

Describe the difference between ionic and covalent bonds.

Back

Ionic bonds involve the transfer of electrons between atoms, while covalent bonds involve the sharing of electrons.