Question

how will a change in temperature affect the amount of dissolved oxygen in a body of water?
a. a decrease in temperature will increase dissolved oxygen.

b. an increase in temperature will not affect dissolved oxygen.

c. a decrease in temperature will not affect dissolved oxygen.

d. an increase in temperature will increase dissolved oxygen.

Explanation:

The solubility of gases in liquids is temperature - dependent. For oxygen in water, as temperature decreases, the kinetic energy of water molecules decreases. This means there is less energy to break the intermolecular forces between oxygen molecules and water molecules, allowing more oxygen to dissolve. Conversely, when temperature increases, the kinetic energy of water molecules increases, and more oxygen molecules gain enough energy to escape from the water (evaporate), reducing the amount of dissolved oxygen.

Answer:

A. A decrease in temperature will increase dissolved oxygen.