A piece of plasticine is kneaded into different shapes, the volume changes, the mass changes, and th

The density is unchanged. Density is a property of matter, only related to the internal properties of the structure, just pinch, the density will not change, density = mass volume The mass changes, the density does not change, and the volume changes

If the mass is 1 2, the volume will become 1 2 Count.

This one doesn't change, density is a property of matter.

However, it is important to note that the density of the gas (when the mass is constant) varies depending on the volume.

Density is an intrinsic property of an object, and it does not change with the change in shape, volume, mass of the object. So the answer is yes: no.

No. The same plasticine is the same substance, and the density is always the same.

Upstairs, it's a piece of plasticine.

You don't have to pay attention to this kind of BT small word question, you just need to understand the meaning of the questioner, if this question appears during the exam, his purpose must not be to test you.

m v, he must have meant to say that density is an intrinsic property of matter

Let's talk about what he emphasizes, he is talking about the density of plasticine, not the density of the kneaded things, so if there is an answer, it must be the same

Density is an intrinsic property of an object that does not change by changing its shape. Density = mass volume.

Density is a special property that does not change with changes in shape, volume, and mass. The general thoughts must be remembered, otherwise how to learn!

will change. Density formula.

Density = mass volume.

Actually, you can see the definition of density (I forgot, so I don't say it, forgive me).

If you pinch it.

The density is unchanged. Volume The mass does not change.

If we say that the volume and mass have changed.

That density must have changed.

The density doesn't change by changing shape!

m, v do not change, and so does the density. Let's ask your teachers!

Similarities: both are physical changes, and they all produce deformation;

Differences: Plasticine is a plastic deformation, which belongs to the deformation caused by the surface affected by external force; The disappearance of water after heating is a change in the state of matter, which is caused by the absorption of heat from the outside world and deformation.

In fact, the fundamental difference between physical change and chemical change is that no new matter is formed in physical change, while chemical change (for example, the process of copper forming patina is chemical change).

The plasticine is kneaded into various shapes and the water is heated and disappears, the similarity of the two cases is that they are gone, the difference is that one is melted in the water, and the other is melted by the fire.

Plasticine and origami will come in many forms, and no matter how you pinch and fold it, it will change the same, but it is still solid. Water is different, it will come in three forms: solid, vapor, and liquid.

Different from the three-state change of water, the three-state change of water is that the liquefaction vaporization and solidification of the water have not changed, so it is only cut into window flowers, or refers to plasticine pinching small animals, the essence is still like a flat top, but the clay makes ceramics, and the chemical changes that occur in it, the first two are physical changes.

Two plasticine blocks of the same shape, size, and quality are as follows:

The shape and size of the two pieces of plasticine are exactly the same, so their quality is exactly the same.

Mass is a physical property of an object, a measure of the quantity of matter, and it is a positive scalar quantity. Mass is divided into inertial mass and gravitational mass. Any matter in nature has both inertial and gravitational mass.

The term "matter" here is a general term for macroscopic objects and electromagnetic fields, celestial bodies and galaxies, and elementary particles of the microscopic world in nature.

Mass is a fundamental concept in physics, and its meaning and content continue to be clarified and enriched with the development of science. Originally, Newton spoke of mass as the quantity of matter, that is, a measure of how much matter there is.

A piece of plasticine in a cube is kneaded into a cuboid, although its shape has changed, the size of the space it occupies has not changed, that is, the volume has not changed

Therefore, the statement that "a piece of plasticine from a cube is kneaded into a cuboid with the same volume" is correct

So the answer is:

When a piece of boxy plasticine is kneaded into a cube, only the shape changes, but the volume does not change

So the answer is:

When a piece of plasticine is kneaded into a ball in the sail, the shape of the object changes.

Since its introduction in 1956, plasticine has become a favorite toy for children. At first, the plasticine was only gray and white, but in the years that followed, the plasticine took on a variety of colors and scents. These include glow-in-the-dark, golden, silver, shampoo, shaved water, and more.

The harm of oak blind branch bark to the body

Generally speaking, the quality of plasticine is formed by mixing flour and spices, which is a viscous polymer compound, does not contain toxic ingredients, and will not be absorbed by the human body, and is usually not harmful to children if they do not eat. Usually play plasticine through ** contact, there is no adverse effect on the human body.

However, low-quality plasticine products may be adulterated with some chemical products that are harmful to the human body, which is unsafe for children, so you must have the product quality in mind when purchasing.

In addition, plasticine may carry bacteria after a long time, so be sure to wash your hands when you are in touch with Shenshan after playing to prevent bacteria from entering your mouth and causing gastrointestinal infection.

It's still so much plasticine.

c The volume remains the same, and the surface area becomes larger. Because the plasticine is still the same as the original, the volume remains the same.

And because the surface area of the cube is the smallest when the volume is equal, the volume becomes larger when the cube is pinched.

For example, a cube has a length of 4 cm, a volume of 4x4x4 64 cubic centimeters, and a surface area of 4x4x6 96 square centimeters.

After being kneaded into a long three-dimensional 2x4x8, the volume is 2x4x8 64, and the surface area is 2x4x2 + 2x8x2 + 4x8x2 112

If it is kneaded into a long three-dimensional shape of 1x4x16, the volume is 1x4x16 64, and the surface area is 1x4x2 + 1x16x2 + 4x16x2 168

It can be seen that the volume of the cuboid has not changed after pinching, but the surface area has increased.

From the analysis, it is known that when a plasticine is kneaded into different shapes, its shape changes, and the surface area also changes, but the volume does not change

Therefore, it is false to say that when plasticine is kneaded into different shapes, both the surface area and the volume may change

So the answer is: