Hot/Cold Pack: Water Molecule Example (8/11)

Hot/Cold Pack: Water Molecule Example (8/11)


So when ice melts, it makes the surroundings colder, which means that bonds are being broken? Yes, water molecules have a partial positive and partial negative side, so we say they are polar. The side with two hydrogens has a positive charge and the side with the oxygen has a negative charge. When the partial positive hydrogen in one water molecule is attracted to the partial negative oxygen of a different water molecule we call this force a hydrogen bond. When water is solid, or ice, each molecule forms four hydrogen bonds. As ice is heated, the kinetic energy of the water molecules increases. The motion of the water means that the water molecules don’t always point in the best direction for a hydrogen bond, so the hydrogen bonding gets weaker.

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