Properties of Seawater Review

Which is denser? Cool seawater or warm seawater?

• Warmer

• Cooler

Answer explanation

Cool seawater is denser than warm seawater because as water cools, its molecules move closer together, increasing density. In contrast, warm seawater has more energy, causing molecules to spread apart, resulting in lower density.

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NGSS.MS-PS1-4

The ocean is slow to heat and slow to cool. This is related to a property of water known as...

• density

• high heat capacity

• low heat capacity

• residence time

• boiling point

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NGSS.MS-ESS2-4

The densest seawater is the...

• coldest

• saltiest

• warmest

• freshest

• coldest and saltiest

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NGSS.MS-ESS2-4

NGSS.MS-ESS2-6

The average salinity of the world ocean is...

• 3.5 0/00 (parts per thousand)

• 21.3 0/00 (parts per thousand)

• 35 0/00 (parts per thousand)

• 52 0/00 (parts per thousand)

• 96.5 0/00 (parts per thousand)

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NGSS.MS-ESS2-4

NGSS.MS-ESS2-6

The most abundant elements found dissolved in our oceans are

• fluorine and iodine

• gold and silver

• bromine and boron

• sodium and chloride

The term salinity refers to...

• dissolved solids in water

• table salt in seawater

• chlorine in water

• chloride in water

• sodium in water

Which property of seawater affects its density the most?

• Temperature

• Salinity

• Pressure

• pH

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NGSS.MS-ESS2-6

What is the average salinity of seawater?

• 1%

• 3.5%

• 5%

• 7%

How does the salinity of seawater affect its freezing point?

• Increases freezing point

• Decreases freezing point

• No effect

• Varies with temperature

Which gas is most abundant in seawater?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Hydrogen