A1.1 - Water

What is the main reason for the polarity of water molecules?

• Sharing of electrons in water molecules is unequal.
• Water molecules have an equal distribution of charge.
• Hydrogen bonds form between water molecules.
• Water molecules are nonpolar and do not have a charge.

What is the medium in which most processes of life occur?

• Water
• Fire
• Air
• Soil

What are the solvent properties of water linked to?

• Its role as a medium for metabolism and transport
• Its low specific heat capacity
• Its low thermal conductivity
• Its high viscosity

How does the viscosity of water compare to that of air?

• Viscosity does not apply to water or air
• Water is less viscous than air
• Water is more viscous than air
• Water and air have the same viscosity

What is the main consequence of water's adhesion to materials that are polar or charged?

• Water loses its ability to transport nutrients in plants and animals.
• Water is unable to interact with polar or charged materials.
• Water forms hydrogen bonds with the materials, causing them to dissolve.
• Water exhibits capillary action in soil and plant cell walls.

What is the relationship between the search for extraterrestrial life and the presence of water?

• The presence of water may be necessary for extraterrestrial life to exist.
• The presence of water is irrelevant to the search for extraterrestrial life.
• The presence of water guarantees the existence of extraterrestrial life.
• The presence of water makes the search for extraterrestrial life more difficult.

How are the solvent properties of water linked to its role as a medium for metabolism?

• Water has no role in the transport of molecules in plants and animals.
• Water prevents the dissolution of hydrophilic molecules, inhibiting metabolic reactions.
• Water dissolves hydrophilic molecules, allowing them to participate in metabolic reactions.
• Water only dissolves hydrophobic molecules, which are necessary for metabolism.

What causes the polarity of covalent bonding within water molecules?

• Ionic bonding
• Equal sharing of electrons
• Unequal sharing of electrons
• Hydrogen bonding

Which physical property of water allows some animals to float in aquatic habitats?

• Thermal conductivity
• Viscosity
• Specific heat capacity
• Buoyancy

Cohesion of water molecules due to hydrogen bonding results in:

• Water being a poor solvent for hydrophilic molecules.
• Water molecules sticking together, forming droplets.
• Water molecules being repelled by each other.
• Water molecules breaking apart easily.

Tags

NGSS.MS-ESS2-4