Seawater Density and Properties

Lab 4 introduces seawater properties, focusing on atomic structure, water molecules, and hydrogen bonds. It explains the covalent bonding in water, the ionic bonds in sodium chloride, and the hydration process that dissolves salt. The lab covers salinity, its measurement using conductivity, and how salinity and temperature affect seawater density. The video concludes with instructions for the lab assignment.

What is the charge distribution in a water molecule?

• Evenly distributed

• No charge distribution

• Net positive on oxygen, net negative on hydrogen

• Net negative on oxygen, net positive on hydrogen

What type of bond is responsible for water's unique properties?

• Covalent bond

• Metallic bond

• Hydrogen bond

• Ionic bond

What is the chemical formula for sodium chloride?

• O2

• H2O

• NaCl

• CO2

How does water dissolve sodium chloride?

• Through evaporation

• By freezing it

• Through hydration

• By heating it

What is the average salinity of seawater in parts per thousand?

• 3.45

• 35

• 345

• 0.35

How was salinity traditionally measured?

• By taste

• By color

• By weight of dissolved solids

• By sound

What is the relationship between salinity and seawater density?

• Density increases with increased salinity

• Density remains constant

• Density decreases with increased salinity

• No relationship

Which factor has a larger effect on seawater density per unit?

• Pressure

• Temperature

• Salinity

• Light

What is an isopicnal?

• A line of constant pressure

• A line of constant density

• A line of constant salinity

• A line of constant temperature

What graph is used to determine seawater density?

• Temperature-Salinity-Density graph

• Salinity graph

• Density graph

• Temperature graph