Ocean Water Chemistry

Multiple Select

Which of the following statements are true? (Select ALL that apply)

• Saltwater is more dense that freshwater

• Freshwater is more dense than saltwater

• Freshwater layers below freshwater because water (H₂0) has more mass than salt (NaCl)

• Saltwater layers below freshwater because the salt molecule (NaCl) has more mass than the water molecule (H₂0)

Multiple Choice

The amount of salt found in water is -

• temperature
• salinity
• pollution
• clarity

Multiple Select

Which are examples of increasing salinity?

• Precipitation into the ocean

• Evaporation of water from the ocean

• Mouth of a river dumping freshwater into an ocean

• Glacier melting into an ocean

• Surface water freezing at the poles

Multiple Select

Which are examples of decreasing salinity?

• Precipitation into the ocean

• Evaporation of water from the ocean

• Mouth of a river dumping freshwater into an ocean

• Glacier melting into an ocean

• Surface water freezing at the poles

Multiple Choice

A substance which can dissolve other substances.

• Solute

• Solution

• Solvent

• Mixture

Multiple Choice

NaCl is easily dissolved in water when its ionic bond is broken by

• the polarity of water molecules

• the hydrophobic nature of sodium chloride

• the neutrality of water molecules

• the neutrality of Sodium Chloride

Multiple Choice

The average salinity of the open ocean is

• 10ppt

• 20ppt

• 35ppt

• 55ppt

Multiple Choice

Processes that remove salts from the ocean include all of the following except...

• Sea spray

• Hydrothermal vents on the seafloor

• Snails uptaking calcium to make their shell.

• Absorption/deposition on the seafloor

Multiple Choice

Which process does NOT lead to a decrease in the salinity of water?

• runoff from land
• precipitation
• sea ice melting
• evaporation

Multiple Choice

Which of the following types of water would SINK the fastest?

• warm and salty

• cold and salty

• warm and fresh

• cold and fresh

Multiple Choice

Which of the following are the most abundant dissolved gases in ocean water?

• CO₂

• N

• O

• All of the above

Multiple Choice

Which is a characteristic that can determine how much gas can be stored in H₂O?

• temperature

• density

• none of the above

• all of the above

Multiple Choice

Marine algae add _______ to ocean water through __________.

• CO₂ through cellular respiration

• O₂  through photosynthesis

• Both answer options

• None of the answer options

Multiple Choice

Zooplankton add a percentage of _________ through ____________.

• CO₂ through cellular respiration

• O₂ through photosynthesis

• both A and B

• None of the above

Multiple Choice

Carbon dioxide (CO₂) enters the ocean from the ______________________________.

• atmosphere

• photosynthesis of aquatic plants and algae

• melting of sea ice

• freezing of seawater

Multiple Choice

Density of seawater is affected by these two factors:

• clarity and color

• hydrogen ions and dissolved oxygen

• transparency and turbidity

• temperature and salinity

Hotspot

Click on the partial negative area of H2O.

Labelling

Label the molecule accordingly.

Drag labels to their correct position on the image

Higher electron probability

Lower electron probability

Match

Match the following

• Cohesion

• Adhesion

• Universal Solvent

When water is attracted to water

When water is attracted to other things

Water

• When water is attracted to water

• When water is attracted to other things

• Water

Drag and Drop

​

Placeholder

is the tendency of water molecules to stick together, while ​

Placeholder

is the tendency of water molecules to stick to other substances

Drag these tiles and drop them in the correct blank above

cohesion

adhesion

Hotspot

Which layer of the ocean would have the highest water pressure