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.
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.
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.
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.
Water does change as it melts from a solid to liquid. That's the change. Its molecules speed up and separate from the lattice structure structure of the ice and become fluid. This is called a physical change because the water molecules themselves do not undergo a change. Solid water and liquid water are still water.If you're talking about temperature, the temperature does not change during the phase change. That's because the heat energy is being used to remove water molecules from the lattice structure. Once all of the water molecules a separated, the temperature can increase.