Quiz on Water Density and Chemical Reactions

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

• 0.5 g/cm³

• 1 g/cm³

• 1.5 g/cm³

• 2 g/cm³

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

• It increases

• It decreases

• It fluctuates

• It remains the same

What is the purpose of a hydrometer?

• To measure temperature

• To measure salinity

• To measure density

• To measure pressure

How does salinity affect the density of water?

• Salinity only affects temperature

• Salinity has no effect on density

• Higher salinity increases density

• Higher salinity decreases density

What is the normal salinity of ocean water?

• 10 grams per liter

• 50 grams per liter

• 20 grams per liter

• 35 grams per liter

What causes water currents in the oceans?

• Differences in pressure and density

• Differences in salinity only

• Differences in density only

• Differences in temperature only

What is relative density?

• Density compared to ice

• Density compared to air

• Density compared to pure water

• Density compared to oil

What happens to water molecules as pressure increases with depth in the ocean?

• They get closer together

• They move further apart

• They remain unchanged

• They evaporate

What is the role of water density in aquatic ecosystems?

• It only affects water currents

• It has no role

• It influences the distribution of organisms

• It affects the temperature only

What is the effect of temperature on the density of water?

• Higher temperature increases density

• Lower temperature increases density

• Temperature has no effect on density

• Temperature only affects salinity