Water Properties and Hydrogen Bonds

Why is water considered essential for life?

• Because it is the least abundant molecule on Earth.

• Because it is not found in any other life form.

• Because it is used only for drinking.

• Because it is the most abundant molecule in our bodies.

What makes ice less dense than liquid water?

• Ice has more hydrogen atoms.

• Ice is heavier than liquid water.

• Ice molecules are packed more closely.

• Ice has a special hexagonal structure.

What is a hydrogen bond?

• A bond where two hydrogen atoms share electrons equally.

• A bond where a hydrogen atom is shared unequally between atoms.

• A bond where oxygen atoms share electrons equally.

• A bond where hydrogen atoms are not involved.

What happens to hydrogen bonds as water cools below four degrees Celsius?

• They break more frequently than they form.

• They form more frequently than they break.

• They form less frequently than they break.

• They stop forming altogether.

What would happen if ice did not float on water?

• The coldest part of the ocean would be the ocean floor.

• Crustaceans would thrive in their habitats.

• Polar ice caps would reflect more sunlight.

• The ocean floor would remain warm.