Question

Выберите верные утверждения. Объём жидкости при охлаждении уменьшается, так как промежутки между молекулами становятся меньшеМолекулы можно увидеть в оптический микроскопМолекулы одного и того же вещества одинаковыРазмеры молекул и атомов очень малы​

Answer 1

Ответ:

Верные ответы:

Объём жидкости при охлаждении уменьшается, так как промежутки между молекулами становятся меньше

Молекулы одного и того же вещества одинаковы

Размеры молекул и атомов очень малы​

Объяснение:

Молекулы нельзя увидеть в оптический микроскоп

Answer 2

Verifying the statements:

1. Объём жидкости при охлаждении уменьшается, так как промежутки между молекулами становятся меньше. - This statement is true. When a liquid is cooled, the molecules slow down and come closer together, resulting in a decrease in volume.

2. Молекулы можно увидеть в оптический микроскоп. - This statement is false. Molecules are generally too small to be seen with an optical microscope. Optical microscopes have a limited resolution, and they can only visualize objects that are larger than the wavelength of visible light. Molecules are typically much smaller than the wavelength of visible light, so they cannot be directly observed with an optical microscope. However, there are other techniques, such as scanning tunneling microscopy or atomic force microscopy, that can visualize individual molecules.

3. Молекулы одного и того же вещества одинаковы. - This statement is generally true. Molecules of the same substance are composed of the same types and numbers of atoms, arranged in the same way. However, it is important to note that there can be different isotopes of an element, which have the same number of protons but different numbers of neutrons. Isotopes can have slightly different molecular weights, but their chemical properties and behavior are generally the same.

4. Размеры молекул и атомов очень малы. - This statement is true. Molecules and atoms are incredibly small. The size of molecules and atoms is typically measured in units such as nanometers (nm) or picometers (pm). For example, the diameter of a water molecule is about 0.28 nm, and the diameter of a hydrogen atom is about 0.1 nm. These dimensions are much smaller than everyday objects and are not visible to the naked eye.

Summary:

- The volume of a liquid decreases when it is cooled because the molecules come closer together. - Molecules cannot be seen with an optical microscope, but there are other techniques that can visualize individual molecules. - Molecules of the same substance are generally identical in terms of their composition and arrangement of atoms. - Molecules and atoms are incredibly small, with sizes typically measured in nanometers or picometers.