Question

1. hydrogen bonds:

lower the heat capacity of water.
make ice less dense than water.
do not affect the heat capacity of water at all.
lower the boiling point of water.
cause ice to melt at a lower temperature.

Explanation:

Hydrogen bonds in water are crucial. They give water a high heat capacity, not lower it. Hydrogen bonds also raise the boiling point of water. And ice melts at 0°C (standard conditions), hydrogen bonds don't make it melt at a lower temperature. When water freezes (forms ice), hydrogen - bonded water molecules arrange in a lattice structure with more space between them compared to liquid water. Since density = mass/volume, and for the same mass of water, the volume of ice is larger, so ice is less dense than water.

Answer:

make ice less dense than water.