Question

multiple - choice question
why does ice float?
of covalent bonds pushing the molecules apart in a lattice causes water to be less dense and thus float
of hydrogen bonds spreading the molecules out in a lattice causes water to be less dense and thus float
of covalent bonds pushing the molecules apart in a lattice causes water to be more dense and thus float
of hydrogen bonds spreading the molecules out in a lattice causes water to be more dense and thus float

Explanation:

Ice floats because hydrogen bonds in water form a lattice - like structure when it freezes, spreading the water molecules apart and making ice less dense than liquid water. Covalent bonds are within the water molecule itself and not responsible for the density change related to ice - floating.

Answer:

The option that says "of hydrogen bonds spreading the molecules out in a lattice causes water to be less dense and thus float" is correct.