What aspect of water is highlighted by the mnemonic "SFDCA"?

• A. Its chemical structure
• B. Dielectric properties
• C. Physical properties
• D. Biological function

Answer: (C)

The mnemonic "SFDCA" refers specifically to various physical properties of water that are significant for understanding its behavior in different contexts. Each letter in the mnemonic stands for a specific property:

• S for Surface tension

• F for Freezing point

• D for Density

• C for Capillary action

• A for Adhesion

These properties illustrate how water interacts with itself and other substances. For instance, high surface tension is critical for the behavior of water droplets, while the freezing point is crucial for biological systems. The unique density of water, which changes with temperature, plays a significant role in aquatic ecosystems as it influences stratification and habitat availability.

The significance of these physical properties is that they form a foundation for understanding not only water's role in the environment but also its importance in biological systems, such as the thermal regulation of living organisms and the functioning of cellular processes. This makes "SFDCA" a useful tool for recalling essential water properties in the context of the MCAT and other biological sciences.