Most substances that have molecules with approximately the same weight as water
ID: 808146 • Letter: M
Question
Most substances that have molecules with approximately the same weight as water molecules are gases at room temperature. Water is a liquid at room temperature because of
the lack of motion of water molecules
ionic bonding between hydrogen ions and oxide ions
covalent bonding between hydrogen atoms and oxygen atoms
extensive hydrogen bonding between water molecules
1.the lack of motion of water molecules
2.ionic bonding between hydrogen ions and oxide ions
3.covalent bonding between hydrogen atoms and oxygen atoms
4.extensive hydrogen bonding between water molecules
Explanation / Answer
It is because of forces between molecules called hydrogen bonds. The hydrogen atoms of one water molecule are attracted to the lone pairs of electrons on the oxygen atoms of adjoining water molecules. This attractive force between molecules is very, very weak on one hand; compared to the attractive forces of a chemical bond, the hydrogen bond attractive forces are really small. Over large distances, however, these small attractive forces add into something very, very powerful. An overall sticky effect is created. "Sticky" in that the water molecules are more attracted to each other than molecules of that molecular mass would normally be. Molecules like oxygen gas and nitrogen gas are gases at room temperature. Because of the hydrogen bonding between water molecules, water is a liquid at room temperature.
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