Question

Определите , какие из приведённых веществ состоят из молекул : кислород , угарный газ , поваренная соль , уксусная кислота , железо. Укажите , какие из них относятся а ) к простым ; б ) к сложным веществам

Answer 1

простые: железо, кислород

сложные: угарный газ, поваренная соль, уксусная кислота

из молекул состоит: кислород и угарный газ.

Answer 2

Ответ:

а) кислород, железо

б) всё остальное

Answer 3

Substances and their Composition

To determine which substances consist of molecules, let's examine each of the given substances:

1. Oxygen: Oxygen (O2) consists of molecules. Oxygen gas is composed of two oxygen atoms bonded together.

2. Carbon Dioxide (Carbonic Acid): Carbon dioxide (CO2), also known as carbonic acid, consists of molecules. It is composed of one carbon atom bonded to two oxygen atoms.

3. Table Salt (Sodium Chloride): Table salt (NaCl) does not consist of molecules. It is an ionic compound composed of sodium ions (Na+) and chloride ions (Cl-) arranged in a crystal lattice structure.

4. Acetic Acid: Acetic acid (CH3COOH) consists of molecules. It is composed of carbon, hydrogen, and oxygen atoms bonded together.

5. Iron: Iron (Fe) does not consist of molecules. It is an element and exists as individual atoms.

Based on the above analysis, the substances that consist of molecules are oxygen, carbon dioxide (carbonic acid), and acetic acid. The substances that do not consist of molecules are table salt (sodium chloride) and iron.

Now, let's determine whether these substances are classified as simple or complex:

a) Simple Substances: Simple substances are pure substances that consist of only one type of atom or molecule. They cannot be broken down into simpler substances by chemical means.

- Oxygen: Oxygen is a simple substance. It consists of oxygen molecules (O2) and is composed of only one type of atom, oxygen.

- Carbon Dioxide (Carbonic Acid): Carbon dioxide is a complex substance. It consists of carbon dioxide molecules (CO2) and is composed of multiple types of atoms, carbon and oxygen.

- Table Salt (Sodium Chloride): Table salt is a complex substance. It consists of sodium chloride ions (Na+ and Cl-) and is composed of multiple types of ions, sodium and chloride.

- Acetic Acid: Acetic acid is a complex substance. It consists of acetic acid molecules (CH3COOH) and is composed of multiple types of atoms, carbon, hydrogen, and oxygen.

- Iron: Iron is a simple substance. It consists of iron atoms (Fe) and is composed of only one type of atom, iron.

Based on the above analysis, the substances that are classified as simple are oxygen and iron, while the substances that are classified as complex are carbon dioxide (carbonic acid), table salt (sodium chloride), and acetic acid.

Please let me know if you need further clarification or have any other questions!