Problem 10 - Biology Concepts and Applications

Question

The warmer water is, the ______ oxygen it can hold. a more b. less

Step-by-Step Solution

Answer

The warmer water is, the less oxygen it can hold (b).

Step 1: Identify the Nature of the Relationship

Begin by understanding the relationship between temperature and oxygen solubility. Warmer water means higher temperatures, which affects how much oxygen the water can dissolve.

Step 2: Recall Scientific Principles

Recall that solubility of gases in liquids tends to decrease with an increase in temperature. This is because increased temperature gives gas molecules more energy to escape from the liquid.

Step 3: Apply Knowledge to Determine the Answer

Based on the principle that increased temperature leads to lower gas solubility, conclude that as water becomes warmer, it holds less oxygen.

Step 4: Choose the Correct Option

Now, choose the option that logically completes the sentence based on the relationship identified: 'The warmer water is, the less oxygen it can hold.' Therefore, the correct answer is 'b. less.'

Key Concepts

Temperature and Gas Solubility

Understanding the relationship between temperature and the solubility of gases in water provides key insights into many natural and scientific phenomena. Generally, solubility refers to how much of a substance (in this case, gas) can dissolve in a liquid (water) at a given temperature. One of the crucial patterns observed is that as the temperature of water increases, the ability of water to dissolve gases decreases.
This can be understood in simple terms: higher temperatures provide more energy to gas molecules. This extra energy makes it easier for the molecules to escape from the liquid. As a result, warmer water holds less dissolved gas than cooler water.
Such knowledge is fundamental in understanding natural ecosystems and processes, where temperature shifts affect oxygen levels, with significant consequences for aquatic life.

Effects of Temperature on Dissolved Gases

The solubility of gases in water drops with a rise in temperature. This principle is crucial as it affects how bodies of water retain essential gases like oxygen. At higher temperatures, gas molecules move more vigorously. This increased movement allows them to break free from the liquid more easily.
A practical example of this can be seen in aquatic environments where warmer water has reduced oxygen levels compared to cooler water. This is why during hot summer months, fish can sometimes be found gasping for air. It’s not because the water lacks oxygen but because warm water cannot hold as much dissolved oxygen.
Understanding these effects is vital for managing ecosystems. Recreational fishing industries and scientists monitoring ecosystems need to consider how temperature variations impact gas solubility and therefore the livelihood of aquatic organisms.

Gas Solubility Principles in Chemistry

The principles of gas solubility in chemistry explain how gases interact with liquids under various conditions. A key concept is the inverse relationship between gas solubility and temperature: as temperature rises, gas solubility falls.
This occurs because gas molecules, supplied with more energy at higher temperatures, can escape the liquid phase. In other words, the higher kinetic energy of molecules at elevated temperatures helps the gas escape into the atmosphere.
These principles have broad applications, from understanding environmental science to chemical engineering. For example, the principles guide industrial processes where temperature control is crucial for maintaining the desired levels of gas solubility. Similarly, these concepts are important in designing and operating aquariums, where maintaining stable temperatures ensures sufficient oxygen levels for aquatic life.