Their speed - Kinetic Energy - increases as the solid melts.
The bonds between hydrogen and oxygen atoms of individual water molecules do not change when liquid water changes to ice. This is a physical change called freezing, and does not cause any chemical changes to occur. Only chemical changes can cause changes in chemical bonds.
Dissolving NaCl in water is a physical change, not a chemical change. The NaCl molecules remain the same chemically, but the arrangement of the particles changes as they interact with water molecules.
The change of water to steam is a physical change, not a chemical change. In this case, the water molecules are simply changing phase from a liquid to a gas, but the chemical composition of water remains the same.
For the small change of temperature between where water exists as a liquid and as a gas the molecules will stay the same size. What changes is the speed the molecules are moving at. Hotter is faster. When moving fast enough (having absorbed enough energy) the molecules break away from the liquid to become water vapour.
Water changes state depending on its temperature and pressure. When water is heated, it can change from a solid (ice) to a liquid (water) to a gas (steam). When water is cooled, it can go from a gas to a liquid to a solid. These changes in state are due to the energy levels of the water molecules.
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Their speed - Kinetic Energy - increases as the solid melts.
The bonds between hydrogen and oxygen atoms of individual water molecules do not change when liquid water changes to ice. This is a physical change called freezing, and does not cause any chemical changes to occur. Only chemical changes can cause changes in chemical bonds.
As water molecules are heated, their average speed increases. This increase in speed is due to the increase in kinetic energy of the molecules, causing them to move faster. This relationship is described by the kinetic theory of gases.
Dissolving NaCl in water is a physical change, not a chemical change. The NaCl molecules remain the same chemically, but the arrangement of the particles changes as they interact with water molecules.
Changes of state are physical changes.
The bonds between hydrogen and oxygen atoms of individual water molecules do not change when liquid water changes to ice. This is a physical change called freezing, and does not cause any chemical changes to occur. Only chemical changes can cause changes in chemical bonds.
Freezing of water is a physical change because it involves a change in state from liquid to solid without altering the chemical composition of water. The molecules in water rearrange to form a crystalline structure in the solid state but remain as H2O molecules.
The change of water to steam is a physical change, not a chemical change. In this case, the water molecules are simply changing phase from a liquid to a gas, but the chemical composition of water remains the same.
When ice changes to water, the arrangement of the atoms does change. In ice, water molecules are held in a rigid, crystalline structure due to hydrogen bonding, while in liquid water, the molecules are more loosely arranged and can move freely. This transition involves breaking some of the hydrogen bonds, allowing the molecules to slide past one another, resulting in a change in the physical state. However, the chemical composition of the water molecules remains the same (H₂O) throughout the process.
From liquid water change to solid: freezing.From liquid water change to gaseous: vaporization.From solid water change to liquid: melting.From solid water change to gaseous: sublimation.
For the small change of temperature between where water exists as a liquid and as a gas the molecules will stay the same size. What changes is the speed the molecules are moving at. Hotter is faster. When moving fast enough (having absorbed enough energy) the molecules break away from the liquid to become water vapour.