What are the factors that affect the concentration of DO?

• Aquatic life- animals living in water use up dissolved oxygen.
• Elevation- the amount of oxygen in elevation increases.
• Salinity (saltiness)- Salty water holds less oxygen than fresh water.
• Temperature- cold water holds more dissolved oxygen than warm water.

What are 3 factors that influence dissolved oxygen levels?

The amount of oxygen that can be dissolved in water depends on several factors, including: water temperature, the amount of dissolved salts present in the water (salinity), and atmospheric pressure (Tables 1 and 2).

What causes dissolved oxygen to decrease?

Temperature increases, decaying aquatic plants and algae, fertilizers, and weather changes are common causes of low dissolved oxygen in the water.

What process increases the amount of dissolved oxygen in water?

Cold water holds more oxygen than warm water. Photosynthesis contributes to an increase in dissolved oxygen levels during the day. However, there are biological processes in water that consume oxygen such as respiration by organisms and decomposition of organic matter by microorganisms.

What affects concentration of a solution?

The concentration of a solution can be changed: concentration can be increased by dissolving more solute in a given volume of solution – this increases the mass of the solute. concentration can be increased by allowing some of the solvent to evaporate – this decreases the volume of the solution.

What are the 7 factors that affect the rate of reaction?

• Concentration of reactants.
• Pressure.
• Temperature.
• Catalyst.
• Nature of reactants.
• Orientation of reacting species.
• Surface area.
• Intensity of light.

How does temperature affect oxygen concentration?

Cold water can hold more dissolved oxygen than warm water. In winter and early spring, when the water temperature is low, the dissolved oxygen concentration is high. In summer and fall, when the water temperature is high, the dissolved-oxygen concentration is often lower.

Which human activity can decrease the oxygen levels present in the atmosphere?

Answer: cutting down of trees and burning of petroleum gases.

What are the factors that affect DO level in water?

Important factors that affect DO in water may include water temperature, aquatic plant photosynthetic activity, wind and wave mixing,organic contents of the water, and sediment oxygen demand.

How do humans affect dissolved oxygen?

HUMAN FACTORS INFLUENCING DISSOLVED OXYGEN Point source pollution – Sewage effluent and factory discharge into waterways can be decomposed by bacteria as above, leading to areas of low DO downstream. Nutrient pollution – Nutrient pollution can cause excess plant and algae growth.

Why does dissolved oxygen decrease with temperature?

Warm water holds less dissolved oxygen than cold water because the molecules are moving faster than in cold water and thereby allow oxygen to escape from the water.

Which factors affect the solubility of oxygen in water?

Normally, oxygen solubility is strongly dependent on (1) the amount of dissolved electrolyte salt(s) (decreases at higher concentration of electrolyte), (2) temperature (decreases at higher temperatures), and (3) pressure (increases at higher pressure).

How does pressure affect dissolved oxygen?

How does pressure affect Dissolved Oxygen solubility? Dissolved oxygen will increase as pressure increases. This is true of both atmospheric and hydrostatic pressures. Water at lower altitudes can hold more dissolved oxygen than water at higher altitudes.

What are the 3 types of concentration?

• Percent Composition (by mass)
• Molarity.
• Molality.
• Mole Fraction.

Which of the following process may decrease the concentration of a solution?

Dilution is the process of decreasing the concentration of a solute in a solution, usually simply by mixing with more solvent like adding more water to the solution. To dilute a solution means to add more solvent without the addition of more solute.

What are 4 factors that affect solubility?

• Temperature. Basically, solubility increases with temperature.
• Polarity. In most cases solutes dissolve in solvents that have a similar polarity.
• Pressure. Solid and liquid solutes.
• Molecular size.
• Stirring increases the speed of dissolving.

Which is an example of concentration affecting the rate of reaction?

Increasing the concentration of reactants also changes reaction rate: Two antacid tablets will neutralize a given amount of acid faster than one tablet will. Higher concentrations of acid in rain erode marble faster than lower concentrations.

What are 5 factors that affect reaction rate?

• The concentration of the reactants. The more concentrated the faster the rate.
• Temperature.
• Physical state of reactants.
• The presence (and concentration/physical form) of a catalyst (or inhibitor).
• Light.

Why does concentration affect reaction rate?

Increasing the concentration of one or more reactants will often increase the rate of reaction. This occurs because a higher concentration of a reactant will lead to more collisions of that reactant in a specific time period.

Does temperature affect do?

Air and Water Temperature Increases Lower levels of dissolved oxygen due to the inverse relationship that exists between dissolved oxygen and temperature.

How does temperature affect oxygen concentration in water?

The actual amount of dissolved oxygen (in mg/L) will vary depending on temperature, pressure and salinity ¹. First, the solubility of oxygen decreases as temperature increases ¹. This means that warmer surface water requires less dissolved oxygen to reach 100% air saturation than does deeper, cooler water.

How does salt affect dissolved oxygen?

Dissolved oxygen decreases exponentially as salt levels increase. That is why, at the same pressure and temperature, saltwater holds about 20% less dissolved oxygen than freshwater.

What are the natural process that increase the concentration of oxygen in the atmosphere?

Photosynthesis – plants produce their own food in the form of glucose using the process of photosynthesis. This process uses sunlight (and so only occurs during the day) to remove carbon dioxide from the atmosphere and release oxygen.

What do you think is are the reasons on the rise and decline of oxygen levels on Earth as years go by?

dissolving in the oceans. use by plants for photosynthesis. formation of fossil fuels as plants died and their carbon compounds became locked up underground. formation of sedimentary rocks from the shells of ancient sea creatures.

What happens if there is too much oxygen in the atmosphere?

Too much oxygen can lead to something called ‘oxygen toxicity’. The excess oxygen at a higher partial pressure (concentration and partial pressure are directly proportional) will cause rampant harmful oxidation in your cells causing them to die.