All schoolchildren in the 8th grade study chemistry. In various educational institutions, teachers choose books at their discretion. But what book would not choose your teacher, find it on our portal in the section Textbooks Grade 8 Chemistry. Here you will find training aids and didactic materials and tasks, that is, absolutely everything that can be useful for you throughout the school year.

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GDZ in chemistry for grade 8 Gabrielyan is a reshebnik or a collection of finished homework, solved examples and tasks calculated by the reaction equations. It is compiled on the basis of a teaching manual for chemistry for eighth graders, compiled by the Honored Scientists of Russia - Gabrielyan O.S.

Reshebnik Replies to Questions in Chemistry Grade 8 Gabrielyan - Help Eighth Classnik

Reshebnik in chemistry for grade 8 Gabrielyan allows you to solve two important tasks in the process of studying schoolchildren:

• First, help schoolchildren with difficult homework in chemistry;
• Secondly, to support parents in checking the academic performance of their Chad.

In Reshebnik, not only the results of solving problems and the reaction equations, but also the step-by-step algorithm for their execution. This makes ready-made solutions clear for children and parents.

Our site forms the most convenient conditions for receiving answers to the tasks of the school year of chemistry for grade 8:

1. In the search string presented on each page, you can drive the task number or shutter speed from its condition - the system will automatically form a list of suitable solutions;
2. You can use the service from a computer, tablet or smartphone.

Since the Reshebniks presented on the website are updated regularly, then schoolchildren should have doubts in the design scheme of the problem or equation. A unique service of intelligent search is the basis of effective time savings.

GDZ in chemistry for grade 8 Gabrielyan O.S. - The main sections of the textbook 2013.

All ready-made online answers of the Reshebnik in Chemistry for the 8th grade are composed on the basis of the textbook Gabrielyan O.S., who was published in the second edition in 2013 under the vulture of the Drop publishing house.

The book presents five thematic chapters in which:

1. The structure of the atom and the process of the atomic compound of chemical elements;
2. The essence of simple substances, their properties and the main changes in them;
3. Mixtures of substances and solutions;
4. Ion exchange reactions and redox processes.

All sections of the textbook are supported by practical tasks and exercises that allow you to effectively assimilate the material.

Our site provides solutions to workshops and tasks that allow you to quickly and efficiently perform homework, as well as prepare for the passage of state final certification.

Keywords: chemistry grade 8. All formulas and definitions, conditional designations of physical quantities, units of measurement, consoles for the designation of units of measurement, relationship between units, chemical formulas, basic definitions, brief, tables, diagrams.

1. Legend, titles and units of measurement
some physical quantities used in chemistry

Physical quantity	Designation	unit of measurement
Time	t.	from
Pressure	p.	Pa, kpa
Number of substances	ν	mole
Mass of substances	m.	kg, g.
Mass fraction	ω	Dimensionless
Molar mass	M.	kg / mol, g / mol
Molar volume	V N.	m 3 / mol, l / mole
Volume of substance	V.	m 3, l
Volumetric share		Dimensionless
Relative atomic mass	A R.	Dimensionless
	M R.	Dimensionless
Relative gas density and gas b	D. B (a)	Dimensionless
Density of substance	r	kg / m 3, g / cm 3, g / ml
Permanent avhipadro	N A.	1 / mol
Absolute temperature	T.	K (Kelvin)
Celsius scale	t.	° С (degree Celsius)
Thermal effect of chemical reaction	Q.	kJ / Mol.

2. Relations between units of physical quantities

3. Chemical formulas in grade 8

4. Basic definitions in grade 8

• Atom - The smallest chemically indivisible particle of matter.
• Chemical element - a certain type of atoms.
• Molecule - the smallest particle of matter, preserving its composition and chemical properties and consisting of atoms.
• Simple substances - Substances whose molecules consist of atoms of one species.
• Sophisticated substances - Substances whose molecules consist of atoms of different types.
• Qualitative composition of matter Shows from the atoms of which elements it consists.
• Quantitative composition of matter Shows the number of atoms of each element in its composition.
• Chemical formula - The conditional record of the qualitative and quantitative composition of the substance through chemical symbols and indices.
• Atomic unit of mass (A.E.M.) - unit of measurement of the mass of the atom, equal to the mass of 1/12 carbon atom 12 C.
• Mole- The amount of substance containing the number of particles equal to the number of atoms in 0.012 kg of carbon 12 C.
• Permanent avhipadro (Na. \u003d 6 * 10 23 mol -1) - the number of particles contained in one mole.
• Molar mass of substances (M. ) - Mass of the substance taken in the amount of 1 mol.
• Relative atomic mass Element BUT r. - The ratio of the mass of the atom of this element M 0 to 1/12 mass of the carbon atom 12 C.
• Relative molecular weight Substances M. r. - The ratio of the mass of the molecule of this substance to 1/12 mass of the carbon atom 12 C. The relative molecular weight is equal to the sum of the relative atomic masses of the chemical elements forming the compound, taking into account the number of atoms of this element.
• Mass fraction Chemical element Ω (x) It shows which part of the relative molecular weight of the substance X accounts for this item.

Atomic molecular teaching
1. There are substances with a molecular and non-acecular structure.
2. Between molecules there are gaps whose dimensions depend on the aggregate state of the substance and temperature.
3. Molecules are in continuous motion.
4. Molecules consist of atoms.
6. Atoms are characterized by a certain mass and dimensions.
In physical phenomena, the molecules are preserved, with chemicals, as a rule, are destroyed. Atoms under chemical phenomena are regrouped, forming a molecule of new substances.

The law of constancy of the composition of the substance
Each chemically pure substance of the molecular structure, regardless of the method of obtaining, has a permanent qualitative and quantitative composition.

VALENCE
Valence is the property of the atom of the chemical element to attach or replace a certain number of atoms of another element.

CHEMICAL REACTION
Chemical reaction - a phenomenon, as a result of which others are formed from some substances. Reagents - substances entering the chemical reaction. Reaction products - substances resulting from the reaction.
Signs of chemical reactions:
1. Selection of heat (light).
2. Change coloring.
3. The appearance of the smell.
4. The formation of precipitate.
5. Gas release.

The most common lack of most reshebniki offered on other sites is their inconsistency with tasks published in textbooks. The reason lies in the fact that today training in schools is far from one textbook. For example, in chemistry in the eighth grade, three of them were developed, and each school has the right to decide independently, in which of them is the teach of children. Reference information posted on our website, this problem eliminates: We have prepared for you absolutely all GDZ, which are based on all the literature designed to study in the school. Here you will find GDZ in chemistry workbook, three options GDZ chemistry textbook. In online mode, you can check the tasks of test control, as well as download GDZ in chemistry grade 8 on your smartphone. Now, the correct answers will always be with you!

Reshebnik in Chemistry Grade 8 for children and their parents

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Chemistry 8 class, GDZ, Reshebnik to which you will pick up in this section of our site, will no longer be a complex subject - no child or for you. Getting knowledge through independent work is the most efficient and affordable way for children and adults. And the availability of material, even from the smartphone, makes the use of our ready-made homework easy, accessible and simple, even without a computer.