Question

Укажите чистые вещества пожалуйста

Answer 1

Чистые вещества: 
Пар (вещество в газообразном состоянии в условиях, когда оно может находиться в равновесии с тем же веществом в конденсированном состоянии) 
Медная проволока (медь - вещество: химический элемент; форма не имеет значения)

Answer 2

Clean Substances

Clean substances refer to pure elements and compounds that are not mixed with any other substances. Some examples of clean substances include:

- Oxygen: Oxygen is a chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements.

- Hydrogen: Hydrogen is a chemical element with the symbol H and atomic number 1. It is the lightest element in the periodic table and is the most abundant chemical substance in the universe.

- Gold: Gold is a chemical element with the symbol Au and atomic number 79. It is a dense, soft, shiny, and highly malleable and ductile metal. Pure gold has a bright yellow color and luster traditionally considered attractive.

- Diamond: Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. At room temperature and pressure, another solid form of carbon known as graphite is the chemically stable form, but diamond almost never converts to it.

- Water: Water is a transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms. It is vital for all known forms of life, even though it provides no calories or organic nutrients.

- Silver: Silver is a chemical element with the symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal.

- Sulfur: Sulfur is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent, and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8.

- Carbon: Carbon is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table.

- Salt (Sodium Chloride): Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions.

- Sugar (Sucrose): Sucrose is a disaccharide composed of glucose and fructose with the molecular formula C12H22O11. It is a clean substance when in its pure form.

These substances are considered "clean" because they are not mixed with any other substances and are in their pure form.