Water and Life

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.

Tags

NGSS.MS-ESS2-4

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.

Tags

NGSS.MS-ESS2-4

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

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.MS-PS2-5

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)

Tags

NGSS.MS-PS1-4

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

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7

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

• true

• false