The melted ice cube may be refrozen, so melting is a reversible physical change. Physical changes that involve a change of state are all reversible. Other changes of state include vaporization (liquid to gas),freezing (liquid to solid), and condensation (gas to liquid). Dissolving is also a reversible physical change.

As the ice melts, the orderly arrangement collapses and the water molecules move past each other and actually get closer together as liquid water. As energy is transferred to the water molecules in the ice, the motion of the molecules increases.

Which statement best describes this change? The ice melting is a chemical change because the water changes form. The ice melting is a physical change because the water may be frozen again.

If only the form of a substance changes, you have observed a physical change. A common physical change occurs when matter changes from one phase to another. When an ice cube melts for example, it becomes liquid water.

A block of ice is solid water. When heat (a form of energy) is added, the ice melts into liquid water. It has reached its melting point – 0°C. Continue to apply heat, and the water will turn into water vapour, which is water in its gaseous state.

When ice melts it converts to water and the density of ice is less than of water. Hence volume will decrease.

As these ice sheets and glaciers melt, the water eventually runs into the ocean, causing sea level to rise. Icebergs and frozen seawater also melt in warm temperatures but do not cause sea level to rise. This is because they are already in the water. As a result, sea level does not rise when sea ice melts.

The answer to your question is that, in general, a given volume of liquid water at room temperature will increase in volume by about 9.05% after freezing. Most materials do the opposite, that is, the solid form of most substances is more dense than their liquid form.

When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%.

A set amount of a substance has a constant number of atoms and going through a phase change does not change the number of atoms, so the mass of water remains the same when it freezes. The mass of any substance is the same when it changes phase from liquid to gas, or solid. This is the principle of mass conservation.

The answer is: once ice is formed, it does not expand as it gets colder. It actually shrinks becoming more dense as it gets colder. The maximum density of water is at 4 deg. C.

Most of the water under the ice is 39 Fahrenheit; however, there is a thin layer of water under the ice that is colder than 39 and therefore less dense.

What property of water helps keep the water below ice from freezing? The hydrogen bonds in ice create a lattice structure (covering layer) the expanded acts as insulation for the water below it.

Originally Answered: Besides water, what other things expand when the get cold? Actually water contracts as it cools, down to 4 degC, and then very slightly expands until it freezes and it expands more then, such that ice floats on water of the very same temperature.

Most matter expands when heated and contracts when cooled, a principle called thermal expansion. The average kinetic energy of the particles increases when matter is heated and this increase in motion increases the average distance between its atoms.

When gas expands, the decrease in pressure causes the molecules to slow down. This makes the gas cold.

The expanding gas that comes from canned air absorbs heat from the can, making it cold.