AP Bio quiz water

How much of Earth's surface is currently covered with water?

• 10%

• 25%

• 50%

• 75%

Answer explanation

Earth is called the water planet because our surface is 75% water.

Only 0.3 % of the surface water is lakes, rivers and streams since most is either ocean or glaciers.

The water droplets clinging to the surface of the leaves is an example of what property of water?

• cohesion

• surface tension

• adhesion

• boiling

Answer explanation

When water molecules cling/or are attracted to anything OTHER than other water molecules it is called ADhesion.

Water molecules have a strong attraction for one another.....and 'stick' together.

This property of water is called:

• density

• evaporative cooling

• cohesion

• adhesion

Answer explanation

Because it is a polar molecule, water is strongly attracted to other water molecules. This tendency of water to stick to itself is called COhesion.

Water is a ________ molecule because the Oxygen end has a partial negative charge and the Hydrogen end has a positive partial charge

• Polar

• Non-polar

• Ionic

• Dense

What term describes the attraction between water molecules due to its POLAR nature?

• ionic bonding

• hydrogen bonding

• evaporation

• freezing

The tendency of water molecules to move UPwards together against gravity due to cohesion and adhesion is called:

• polarity

• sinking

• coloring

• Capillary action

The ability of the water molecules to hold the paper clip on the surface is called:

• surface tension

• density

• polarity

• evaporation

Which form of water is LEAST dense as a solid because of its crystal arrangement, and will float above water when it has released heat (energy)?

• Solid (ICE)

• Liquid (Water)

• Gas (Water vapor)

In _________________, cells use sunlight in order to change carbon dioxide (CO₂) and water (H₂O) into glucose (C₆H₁₂O₆) and Oxygen gas (O₂)........which is an example of biosynthesis

• Photosynthesis

• dissolving

• Hyponatremia

• oxytocin

Water is called the "universal solvent" because it can dissolve ionic compounds (salts)

• true

• false