Answers exams in Chemistry

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Number of Pages - 11, 12 font.

Questions in Chemistry:
1. Subject of chemistry. The basic laws of chemistry.
2. The law of equivalents.
3. The equivalence of mass and an equivalent volume.
4. The law of Avogadro. The relative density of the gas.
5. The structure of the atom. Isotopes.
6. The model of the hydrogen atom Bohr. Bohr's postulates.
7. The quantum numbers. The concept of orbitals.
8. The main and secondary quantum numbers. The energy levels and sub-levels in the atom.
9. The connection between quantum numbers. Magnetic and spin quantum numbers.
10. The distribution of electrons in the quantum cells. The Pauli principle. Hund's Rule. Aufbau principle.
11. Electronegativity and its change in periods and groups.
12. The periodic table and periodic law of DI Mendeleev.
13. Changing the properties of metallic and non-metallic elements in the periodic system DI Mendeleev.
14. oxides. Their preparation and properties.
15. Grounds. Their preparation and properties.
16. Acids. Their preparation and properties.
17. Types of salt. Their nomenclature.
18. Methods of preparing salts.
19. Properties salts.
20. The formation of a covalent bond. Its main properties.
21. Characteristics of a covalent bond. σ and π - bond.
22. The ionic bond.
23. The metallic bond. The most important properties of metals.
24. The rules for determining the degree of oxidation.

Additional information

1. Subject of chemistry. The basic laws of chemistry.
Chemistry - the science of materials, their properties and transformations. Everything is made of molecules and atoms of the molecule.
Molecule - the smallest particle of matter, which retains its chemical properties.
Atoms - the smallest particle of an element retains its chemical properties.
Atoms - the smallest particle of a substance that has a specific charge of the nucleus.
Chem. element - the kind of atoms that have the same nuclear charge.
Chemical formula reflects the qualitative and quantitative composition of the molecule (H2O).
All chemical transformations are described with 3 kinds of recording:
1. Schematic transformations - indicates starting and final reaction products. Represented by: «→».
NaOH + H2SO4 → NaSO4 + H2O
2. The equations of irreversible reactions include factors like starting and end products of the coefficients, the separation of the equal sign (=).
2NaOH + H2SO4 = NaSO4 + 2H2O
3. Reversible reactions also contain factors placed a sign of reversibility ().
CO (tv.) + H2O (water) CO (gas) + H2
Each atom has a certain weight:
m (H) = 1,67 * 10-24 g
m (H2O) = 2,99 * 10-23 g
The mass of the atom and the molecule is reflected in relative terms, ie in atomic mass units (amu). 1/12 1 amu = weight (molar) isotope carbon-12.


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