Water Molecules

Which of the following correctly describes the polarity of a water molecule?

• Water is nonpolar due to the symmetrical distribution of its electrons.

• Water is polar due to the uneven distribution of electron density between hydrogen and oxygen.

• Water is polar due to the equal sharing of electrons between hydrogen and oxygen.

• Water is nonpolar because hydrogen and oxygen have equal electronegativity.

What type of bond is responsible for the cohesive properties of water?

• Covalent Bond

• Ionic Bond

• Hydrogen Bond

• Van der Waals Force

Water’s high specific heat capacity is primarily due to:

• Its low molecular weight.

• Its high molecular mass.

• The ionic bonds present in water.

• The strength of hydrogen bonds between water molecules.

Which property of water allows it to form an effective solvent for ionic and polar substances?

• High specific heat capacity

• High surface tension

• Polarity and ability to form hydrogen bonds

• Low density when frozen

A student measures the temperature of a water sample and notices that it does not change significantly despite the addition of heat. This observation is an example of which property of water?

• High density

• High Specific Heat Capacity

• High surface tension

• High heat vaporization

What is the main reason that ice is less dense than liquid water?

• Ice forms covalent bonds that are stronger than those in liquid water.

• Ice has more hydrogen bonds per molecule than liquid water, creating a less dense lattice structure.

• Ice molecules are larger and heavier than liquid water molecules.

• Ice has fewer hydrogen bonds per molecule than liquid water.

Water’s surface tension is a result of:

• Hydrogen bonding between water molecules at the surface.

• Covalent bonding between water molecules.

• Ionic interactions between water molecules.

• Van der Waals forces between water molecules.

A study examines the effect of water availability on plant growth. The study finds that plants grow best with optimal water levels, showing the importance of which water property?

• High density

• High heat of vaporization

• High specific heat capacity

• Polarity

An aquatic environment shows seasonal changes in the density of water. How does the density of water change with temperature in this context?

• Density decreases as temperature decreases below 4°C.

• Density increases as temperature increases.

• Density remains constant regardless of temperature changes.

• Density increases as temperature decreases.

Which of the following scenarios best demonstrates water's ability to act as a solvent?

• The formation of ice on the surface of a lake during winter.

• The dissolution of table salt in a glass of water, forming a saline solution.

• The high heat required to boil water compared to ethanol.

• The ability of water to absorb sunlight more effectively than oil.