Why does water become ice, the mass remains the same, and why does water become ice, and why does wa

This problem can be explained from a microscopic point of view, when the water is in a liquid state, the gap between the water molecules is larger, so it has good fluidity, when the water becomes ice, the gap between the water molecules will decrease, and the molecules become compact between the molecules, at this time, the liquid water becomes solid ice, but in this process, the number of water molecules is not lost, that is, the front and back remain unchanged, so the quality of water to ice is unchanged.

When the water is in a liquid state, the gap between the water molecules is larger, so it has good fluidity, when the water becomes ice, the gap between the water molecules will decrease, and the molecules become tight between the molecules, at this time, the liquid water becomes solid ice, but in this process, the number of water molecules is not lost, that is, the front and back remain unchanged, so the quality of water becomes ice, understand?

This one just has changed physically, and the quality has of course not changed.

Or, you can think of it this way.

Mass = Density * Volume.

When water becomes icy, it becomes larger in volume but less dense, so the final result remains the same.

Mass is a fundamental property of matter that does not change with changes in the state, shape, and spatial position of an object. When water becomes ice, it only changes the state of matter, so the water becomes ice, and the mass remains the same.

The mass is constant, because the density of water is greater than that of ice, but the volume decreases when ice is converted into water, so the mass is constant from m=p*v.

A pound of iron or a pound of cotton, which is heavier? With this question, you can understand why.

Ice melts into water, and the mass remains the same, but you misunderstand this sentence.

The melting of ice into water is a physical change, a change in the state of matter. But water molecules.

But the volume has not changed, the number of water molecules has not changed, and the mass of water molecules has not changed.

The meaning of this sentence in the answer is: the ice melts into water, and the mass of the ice becomes smaller. Because a part of the ice turns into water, the mass of the ice decreases, but the total mass of the original ice and the sum of the mass of the ice and water remain the same.

According to the principle of conservation of mass, the mass of ice should remain unchanged in the process of turning into water. ButBecause the ice continues to absorb heat and evaporate water during the melting process, the quality of the evaporated part of the water is lost after the ice becomes water, so the quality of the ice is constantly decreasing in the process of melting into water(Experimental results can confirm that after the ice melts into water, the mass of water is less than the mass of ice).

This question is wrong, "ice melts and water mass decreases" is wrong, so choose D

This is a wrong statement.

Here's why:

When water freezes, it increases in volume because of the water molecules in liquid water.

There is a strong hydrogen bonding force between them, so the volume is smaller. After the water condenses into ice, due to intermolecular hydrogen bonding.

action, which is highly oriented (similar to diamond.

of the tetrahedron.

Structural arrangement. Compared with liquid water, which is chaotic with clusters of molecules, it has a lower space utilization, so the density is smaller, and the volume is larger at the same mass.

Characteristics of ice

Ice is the solid form of water in nature, and the temperature is above zero degrees Celsius under atmospheric pressure.

, the ice will begin to melt and turn into liquid water. A Japanese research team found that when ice begins to melt, a water molecule in the crystal begins to decrystallize as a trigger, and the related mechanism helps to understand the mechanism of structural changes in water-containing proteins.

Ice is a colorless and transparent solid, the molecules mainly rely on hydrogen bonding, and the lattice structure is generally hexagonal, but there can be other lattice structures according to different pressures; The density is less than that of water.

Mass does not change, mass is a property of an object, it does not change with the change of state. But the volume changes, and the volume becomes smaller when the ice turns into water. Ice is a colorless and transparent solid, the molecules mainly rely on hydrogen bonding, and the lattice structure is generally hexagonal, but there can be other lattice structures according to different pressures.

The density is less than that of water.

Ice is the solid form of water in nature, and when the temperature is above zero degrees Celsius at atmospheric pressure, the ice will begin to melt and become liquid water. A Japanese research team found that when ice begins to melt, a water molecule in the crystal begins to decrystallize, which helps to understand the mechanism of structural changes in water-containing proteins.

When exposed to strong light such as electric lamps, the inside of the ice melts, and a snow-like shape called "ice flakes" emerges. Researchers from the Japan Institute of Molecular Science and Okayama University used computers to investigate the phenomenon of ice melting from the inside to heat up the refrigeration stove, using a computer to calculate what happens when ice formed by about 1,000 water molecules is heated.

Ice crystals are structures in which water molecules are regularly arranged in a hexagonal shape. After heating, first of all, a water molecule detachs from the crystallization and begins to move freely, and this water molecule does not return to its original position, resulting in distortion of the crystal. Once the crystals are distorted, they will gradually expand, and eventually the entire crystals will decompose and become liquid.

The experimental procedure for turning water into ice is as follows:

Prepare the materials for the experiment: a bottle of mineral water, some ice cubes, a glass of water.

Experimental steps: 1. The first step is to put a bottle of mineral water in the freezer layer of the refrigerator, let it go for two hours, take it out, and the water is still liquid.

2. Then take the bottle and knock it the table, and the whole bottle of water will change from transparent to translucent.

3. Then pour ice cubes into the prepared glass of water.

4. Finally, open the mineral water bottle just now, slowly pour the water onto the ice, and the moment the water flows out, it freezes.

Experimental principle: A bottle of mineral water is placed in the freezer layer of the refrigerator for two hours, when the temperature of the water is already below 0 (as low as below freezing), but because of the lack of condensation nuclei in the water, the water is still in a liquid state, such water is called supercooled water. Slowly pour supercooled water into a glass glass with ice cubes, at this time the ice cubes in the glass are condensation nuclei, and the supercooled water will slowly freeze.

Water freezing is a physical change in solidification, and microscopically speaking, it is just that the water molecules change from a relatively scattered arrangement to a compact one. When the temperature of water decreases, the process of changing the substance from a liquid state to a solid state, and the temperature at which the substance solidifies is called the freezing point. Almost all known liquids can solidify into solids at low temperatures.

The melting point of water at one atmosphere is very close to 0, and if there is a nucleating agent, its freezing point will be very close to the melting point, but if there is no nucleating agent, the water will be supercooled below 0, and it will not form ice until 40. At a high pressure of 2,000 atmospheres, the water is in a supercooled state until 70.