Properties of Water

What causes the oxygen atom in a water molecule to carry a partial negative charge?

• The oxygen atom has a higher electronegativity than hydrogen atoms.

• The oxygen atom has a lower electronegativity than hydrogen atoms.

• The oxygen atom shares electrons equally with hydrogen atoms.

• The oxygen atom donates electrons to hydrogen atoms.

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What is the attraction between a hydrogen atom with a partial positive charge and another atom with a partial negative charge known as?

• The attraction is known as a hydrogen bond.

• The attraction is known as a covalent bond.

• The attraction is known as an ionic bond.

• The attraction is known as a metallic bond.

Cohesion is an attraction between molecules of the ________.

• Cohesion is an attraction between molecules the same substance

• Cohesion is an attraction between molecules of different substances

• Cohesion is an attraction between molecules that are nonpolar

• Cohesion is an attraction between molecules of a plasma

What is the force that draws water out of the roots of a plant and up into its stems and leaves called?

• Capillary action

• Transpiration

• Photosynthesis

• Osmosis

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What is heat capacity?

• The amount of heat energy required to increase water's temperature.

• The amount of heat energy required to decrease water's temperature.

• The amount of heat energy required to freeze water.

• The amount of heat energy required to evaporate water.

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Water's latent heat of vaporization is important for life on Earth because it:

• Helps regulate Earth's temperature by absorbing heat.

• Increases the salinity of oceans.

• Reduces the amount of water available for plants.

• Causes rapid cooling of the Earth's surface.

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Ice is less dense than liquid water because:

• The molecules in ice are more tightly packed.

• The hydrogen bonds in ice create a lattice structure.

• Ice contains more air bubbles.

• The temperature of ice is lower than that of water.

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What is a solvent?

• A substance that dissolves in water.

• A substance that water dissolves.

• A substance that dissolves other substances.

• A substance that cannot dissolve in water.

Suspensions are a type of:

• Solution

• Colloid

• Mixture

• Compound

Liquid water is less dense than ice. True or False?

• True

• False

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