Review about molecules (Grade 11)

What is the definition of dipole?

• A molecule in which concentration of positive electric charge is separated from a concentration of positive charge

• A molecule in which concentration of positive electric charge is separated from a concentration of negative charge

• A molecule in which concentration of positive electric charge is combined with a concentration of positive charge

• A molecule in which concentration of positive electric charge is combined with a concentration of negative charge

What is the meaning of "water is described as being polar"?

• It has a slight charge difference across the different poles of the molecule

• It has a slight charge similarity across the different poles of the molecule

• It has a slight charge difference between the same poles of the molecule

• It has a slight charge similarity between the same poles of the molecule

What is the term for the attraction of water molecule to other polar molecule?

• cohesion

• capillary action

• adhesions

• surface tension

The surface tension of water molecule is the properties of.....

• cohesive

• adhesive

• high specific heat

• polarity

Attraction to charged or polar surfaces allow water to flow in opposition of gravitational force. That is the definition of...

• cohesion

• adhesion

• surface tension

• capillary action

Which can be explained by the solvent properties of water?

• Sodium chloride is transported as Na⁺ and Cl^– in blood

• Movement of water occurs under tension in the xylem

• Water is the coolant in sweat

• Ice floats on liquid water

What is a property of water?

• Water has a low specific heat capacity so large increases in heat energy cause a small temperature change

• Water is an excellent solvent for non-polar substances

• Covalent bonds between adjacent water molecules are responsible for its unique properties

• Water molecules are highly cohesive which is important for transport in xylem

Substance that freely associate and readily dissolve in water are characterized as...

• Hydrophobic

• Hydrophilic

• water-hating

• universal solvent

What is the benefit to living organisms that water has a high specific heat capacity?

• Heat can be lost from the skin when sweat evaporates

• Aquatic environments do not have a great fluctuation in their temperature

• The amount of heat stored by water is highly predictable

• It allows water to be a solvent for chemical reactions at body temperature

These are the physical properties of water and the consequences for animals in aquatic habitat, except...

• Buoyancy and viscosity

• thermal conductivity

• specific heat capacity

• adhesion