Which of the following statements is true about hydrogen bonds?

Question

Quizplus · Accepted Answer

Hydrogen bonding occurs between molecules when at least one contains a hydrogen atom and both molecules have a small electric charge because the molecule is polar. Polar molecules, such as water, result from one atom having a stronger pull on the shared electrons, which causes the atoms to have slight negative or positive charges. The slight positive charge of the hydrogen atoms allow them to form hydrogen bonds with the atoms in other polar molecules with slightly negative charges. Hydrogen bonding can alter the chemical properties of the molecules involved, such as raising the melting point of a solid.
Water is strongly affected by hydrogen bonding. Because the hydrogen bonds attract water molecules to one another, water is more tightly packed in liquid form than in solid form, where the molecules are held further apart in a lattice. So if water is cooled, it becomes more dense and forms ice. Water is one of the few substances whose solid state can float on its liquid state.

Which of the Following Statements Is True About Hydrogen Bonds