Lesson 2 the Physical Properties of Water

What is the density of pure water at 4°C?

• 1 g/cm³

• 0.5 g/cm³

• 2 g/cm³

• 1.5 g/cm³

What happens to the density of water as the temperature decreases from 4°C to its freezing point?

• It fluctuates

• It remains the same

• It decreases

• It increases

What instrument is used to measure the density of liquids?

• Hydrometer

• Barometer

• Thermometer

• Manometer

How does salinity affect the density of ocean water?

• It decreases density

• It has no effect

• It increases density

• It fluctuates density

At what temperature does water reach its maximum density?

• 100°C

• 0°C

• 4°C

• 10°C

What is the primary source of oxygen in aquatic environments?

• Photosynthesis by aquatic plants

• Industrial pollution

• Decomposition of organic materials

• Atmospheric air

What effect does increased carbon dioxide have on water pH?

• Fluctuates pH

• No effect

• Increases pH

• Decreases pH

What happens to the solubility of gases in water as temperature increases?

• It decreases

• It fluctuates

• It increases

• It remains the same

What is the normal salinity level of ocean water?

• 50 grams per liter

• 20 grams per liter

• 10 grams per liter

• 35 grams per liter

What is the impact of decreased carbon dioxide levels on aquatic plants?

• Increased photosynthesis

• Reduced photosynthesis

• No effect

• Enhanced growth