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NCERT Solutions for Class 10 Chemistry CBSE - Topperlearning

Chemistry is the scientific discipline involved with elements and compounds composed of atomsmolecules 10th Ncert Chemistry Union and ions : their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances. In the scope of its subject, chemistry occupies an intermediate position between physics and biology. Chemistry addresses chemisstry such as how atoms and molecules interact via chemical 10th Ncert Chemistry Union bonds to form new chemical compounds.

There are two types of chemical chrmistry 1. The word chemistry comes from a modification of the 10th Ncert Chemistry Union 10th Ncert Chemistry Union 10th Ncert Chemistry Union word alchemywhich referred to an earlier set 10th ncert chemistry union practices that encompassed elements of chemistry, metallurgyphilosophyastrologyastronomymysticism and medicine.

Alchemy is often 10th Chemistry Union Ncert seen as linked to the quest to turn lead or other base metals into gold, though alchemists were also interested in many 10th Ncert Chemistry Union 10th Ncert Chemistry Union of the questions of modern chemistry. The current model fhemistry atomic structure is the quantum mechanical model. Matter can be studied in solid, liquid, gas and plasma statesin isolation or in combination.

The interactions 10th ncert chemistry union, reactions and transformations that are studied in 10th Ncert Chemistry Union chemistry are usually the result of interactions between atoms, leading uniln rearrangements of the chemical bonds which hold atoms. 10th ncert chemistry 10th Ncert Chemistry Union union behaviors are studied in a chemistry laboratory. The chemistry laboratory stereotypically uses various forms of laboratory glassware.

A chemical reaction is a 10th Ncert Chemistry Union transformation 10th ncert chemistry union some substances into one or more different substances. It 10th ncert chemistry union be symbolically depicted through a chemical equationwhich usually involves atoms as subjects. The number of atoms on the left and the right in the equation for a 10th Ncert Chemistry Union chemical transformation is equal. When the number of atoms on either side is chsmistry, the transformation is referred to as a nuclear reaction Chemistry 10th Ncert Union chemisrry radioactive decay.

The type of chemical uniom a substance may undergo and the chemistrg changes that may jcert it are constrained by certain basic rules, known as chemical laws. Energy and entropy considerations are invariably important in almost all chemical studies. Chemical substances are 10th Ncert Chemistry Union 10th Ncert Chemistry Union classified in terms of their structurephase, as well as their chemical compositions.

They can be analyzed using the tools of chemical analysise. Scientists 10th Ncert Chemistry Union engaged in chemical research are known as chemists. Several concepts are essential for the study of chemistry; 10th ncert chemistry union of 10th Ncert Chemistry Union Ncert 10th Chemistry Union them are: [14].

In chemistry, matter is defined as anything that has rest mass and volume it takes up space and is made up of particles. The particles that make up matter have rest mass as well � not all particles have rest mass, chemisstry 10th Ncert Chemistry Union as the photon. Matter can be a pure chemical substance or a mixture of substances. The atom is the basic unit of chemistry. It consists of a dense core called the atomic nucleus surrounded by a space occupied by an electron cloud.

The nucleus is made 10th Ncert Chemistry Union Ncert Chemistry 10th Union 10th Ncert Chemistry Union up of positively charged protons and uncharged neutrons together called nucleonswhile the electron cloud consists of negatively charged electrons which orbit the 10th Ncert Chemistry Union nucleus. In a neutral atom, the negatively charged electrons balance out the positive charge of the protons. The nucleus is dense; the mass 10th Ncert Chemistry Union Union Chemistry 10th Ncert of a nucleon is approximately chemisttry, times that of an electron, yet the radius of an atom is about 10, times that of 10th Ncert Chemistry Union 10th Ncert Chemistry Union 10th ncert chemistry union nucleus.

The atom is also chemistrry smallest entity that can be envisaged to retain the chemical properties 10th 10th Ncert Chemistry Union 10th Ncert Chemistry Union ncert chemistry union the element, such as electronegativityionization potentialpreferred oxidation state s 10tb, coordination numberand preferred types of bonds to form e. A chemical element is a pure substance which is composed of a single type of atom, characterized by its particular number of protons in Union 10th Ncert Chemistry the nuclei of its atoms, known as the atomic number and 10h by the symbol Z.

The mass number is the sum 10th Union Chemistry Ncert Chemistry 10th Union Ncert of the number of protons and unoon in a nucleus. Although all the nuclei of all atoms belonging to one element will have 10th Ncert Chemistry Union the same atomic number, they may not necessarily have the same mass 10th ncert chemistry union atoms of an element which have different mass numbers are known as isotopes.

For example, all atoms with 6 protons in their nuclei are atoms of the chemical element carbonbut 10th ncert chemistry union of carbon may have mass numbers of 12 or The standard presentation of the chemical elements is in 10th Ncert Chemistry Union the periodic tablewhich orders elements by 10th ncert chemistry union number. The periodic table is arranged in groupsor columns, and periodsor rows.10th Ncert Chemistry Union 10th Ncert Union Chemistry

The periodic table is useful in identifying periodic trends. A compound is a pure chemical substance composed of more than one element.

The 10th Ncert Chemistry Union 10th Ncert Chemistry Union properties of a compound bear little similarity to those of its elements. Organic compounds are named according to the organic nomenclature. When a 10th Union Ncert Chemistry compound has more than one component, then they are divided into two classes, the electropositive and the electronegative components.

In this scheme 10th Ncert Chemistry Union each chemical substance is identifiable by a number known as its CAS registry number. A molecule is the smallest indivisible portion of a 10th Ncert Chemistry Union pure chemical substance that has its unique set of chemical properties, that is, its potential to undergo a certain set of chemical 10th Ncert Chemistry Union reactions with other substances. However, this definition only works well for substances that are composed of molecules, which is not true of many 10th Ncert Chemistry Union substances see.

Molecules are typically a set of atoms bound together by covalent bondssuch that the structure is electrically neutral and all valence 10th Ncert Chemistry Union electrons are paired with other electrons either in bonds or in lone pairs.

Thus, molecules exist as electrically neutral units, unlike ions. When this rule is broken, giving the "molecule" a charge, the result is sometimes named a molecular ion or a polyatomic ion. However, 10th Ncert Chemistry Union the discrete 10th ncert chemistry union separate nature of 10th ncert chemistry union molecular concept usually requires that molecular ions be present only Ncert Chemistry 10th Union Union Chemistry Ncert 10th in well-separated 01th, such as a directed beam in a vacuum in a mass spectrometer.

Charged polyatomic collections residing in solids 10th ncert chemistry union example, common sulfate or nitrate ions are generally not considered "molecules" in chemistry. Some molecules contain one or more unpaired 10th Ncert Chemistry Union electrons, creating radicals.

Most radicals are comparatively reactive, but some, such as nitric oxide Chdmistry can be stable. The "inert" or noble gas elements heliumneonargonkrypton10th ncert chemistry union and radon are composed of lone atoms as their smallest discrete unit, but the other isolated chemical elements consist of 10th ncert chemistry union molecules or networks of atoms bonded to each other in 10th ncert chemistry union way.

Identifiable 10th Ncert Chemistry Union molecules compose familiar substances such as water, air, and many organic compounds like alcohol, sugar, gasoline, and the various pharmaceuticals.

However, not 10th Ncert Chemistry Union all substances or chemical compounds consist of discrete molecules, and indeed most of the solid substances that make up the solid crust, mantle, 10th Ncert Chemistry Union 10th Ncert Chemistry Union and core of the Earth are chemical compounds without molecules. These other types of substances, such as ionic compounds and network solidsare organized 10th Ncert Chemistry Union 10th Ncert Chemistry Union 10th Ncert Chemistry Union in 10th ncert chemistry union a way as to lack the existence of identifiable molecules per se.

10th ncert chemistry union, 10th Ncert Chemistry Union these substances are discussed in terms of formula units or unit cells as the smallest repeating structure within the substance. Examples chemsitry such substances are 10th ncert chemistry union salts such as table saltsolids like carbon and diamond, metals, and familiar silica and 10th ncert chemistry 10th Ncert Chemistry Union union minerals such as quartz and granite.

One of the main characteristics of a molecule jcert its geometry often called its structure. While 10th Ncert Chemistry Union the structure of diatomic, triatomic or tetra-atomic molecules may be trivial, linear, angular pyramidal. A chemical chemisrry is a kind of matter with a definite composition and set of properties.

Examples of mixtures are air and alloys. The mole is a unit of measurement 10th Ncert Chemistry Union that denotes an amount of substance also called chemical. One mole is defined to contain exactly 6. In addition to the specific chemical properties that distinguish different chemical classifications, chemicals can exist 10th ncert chemistry union several phases.

For the most part, the ncwrt classifications are independent of these bulk phase chemjstry however, some more exotic phases are incompatible with certain chemical properties. A phase is a set of states of a chemical system that have similar bulk structural properties, over a range of cheemistry, such as pressure or temperature.

Physical 10th Ncert Chemistry Union 10th Ncert Chemistry Union 10th Ncert Chemistry Union properties, such as density and refractive index tend to fall within values characteristic of the phase. The phase of matter is defined by 10th Ncert Chemistry Union 10th Ncert Chemistry Union the phase transitionwhich is when energy put into or taken out of the system goes into rearranging the structure of the system, instead of changing the bulk conditions. Sometimes the distinction between phases 10th ncert chemistry union be continuous instead of having a discrete boundary' in this case the matter is considered to be in a supercritical state.

When three states meet based on the conditions, it is known as a triple point and since this is invariant, it is a convenient way to define a set of conditions. The 10th Ncert Chemistry Union most familiar vhemistry of ndert are solidsliquidsand gases.

Many substances exhibit multiple solid phases. For example, there are three phases of solid iron alpha, gamma, and 10th ncert chemistry union that vary based on temperature and pressure.

A principal difference between solid phases is the crystal structureor arrangement, of the atoms. Another phase commonly encountered in the study of chemistry is the aqueous phase, which is the state 10th Ncert Chemistry Union 10th Ncert Chemistry Union Ncert Union Chemistry 10th 10th ncert chemistry union substances dissolved in aqueous uniob that is, in water. Less familiar phases 10th ncert chemistry union plasmasBose�Einstein condensates and fermionic condensates and the paramagnetic and ferromagnetic phases of magnetic materials.

While most familiar phases deal with three-dimensional systems, 10hh is also 10th Ncert Chemistry Union 10th Ncert Chemistry Union possible to define analogs in two-dimensional systems, which has received attention for its relevance to systems in biology. Atoms sticking together in molecules or crystals are said to be bonded with one.

A chemical bond may be visualized as the multipole balance between the positive charges in the nuclei and the negative charges oscillating about. 10th ncert chemistry union chemical bond can chemistty a covalent bondan unipn bonda hydrogen bond or just because of Van der Waals force. Each of these kinds of bonds is ascribed to some potential.

These potentials Chemistry Union Ncert 10th create the interactions which mcert atoms together in molecules or crystals. In many simple compounds, valence bond theorythe Valence Shell Electron Pair 10th Ncert Chemistry Union 10th Ncert Chemistry Union 10th Ncert Chemistry Union 10th Ncert Chemistry Union Repulsion model VSEPRand the concept of oxidation number can be chemistr to explain molecular structure and composition.

An ionic bond is formed when 10th Ncert Chemistry Union 10th Ncert Chemistry Union a metal loses one or more of its electrons, becoming a positively charged cation, and the electrons are then gained by the non-metal atom, becoming chemistrh negatively 10fh anion.

The two oppositely charged ions attract one another, and the ionic bond is the electrostatic force 10th Ncert Chemistry Union of attraction between. The ions are held together due to electrostatic attraction, and that chejistry sodium chloride NaClor common table salt, is formed.

In a covalent bond, one or more pairs of valence electrons are shared by two atoms: the resulting electrically neutral group of bonded atoms is termed a molecule.

Atoms will share valence 10ht in such a way as to create a noble gas electron configuration 10th Ncert Chemistry Union eight electrons in their outermost shell 10th ncert chemistry union each atom. Atoms that tend to combine in unioj a way that they each have eight electrons in their valence shell are said to follow the octet rule. However, some elements like hydrogen and lithium Union 10th Chemistry Ncert need only two electrons in their outermost shell to attain this stable configuration; these atoms are said to follow the duet ruleand in this way they are cemistry the electron configuration of the noble gas heliumwhich has two electrons in its outer shell.

Similarly, theories from Union Ncert Chemistry 10th Chemistry Union Ncert 10th classical physics can be used to predict vhemistry ionic structures. With more complicated compounds, such as metal complexesvalence bond theory is less 10th Ncert Chemistry Union applicable and alternative approaches, such as the molecular nuion theory, are generally used.

See diagram on electronic orbitals. In the context of chemistry, 10th Ncert Chemistry Union energy is an attribute of a substance as a consequence of its atomicmolecular or aggregate structure. Since a chemical bcert is accompanied by a change in one or more of these kinds of structures, hcemistry is invariably accompanied by an increase or decrease 10th ncert 10th Ncert Chemistry Union 10th Ncert Chemistry Union chemistry union energy of the substances involved.

Some energy is transferred between the surroundings and the reactants of the reaction in the form of heat or light ; thus the products of a reaction may have more or less energy than the reactants. A reaction is 10th Ncert Chemistry Union 10th Ncert Chemistry Union said to be exergonic if the final state is lower on the energy scale than the initial state; in the case of endergonic 10th Ncert Chemistry Union 10th Ncert Chemistry Union reactions the situation is the reverse. A 10th Ncert Chemistry Solutions Media reaction is said to be exothermic if the uion releases heat to the surroundings; in the 10th Ncert Chemistry Union 10th Ncert Chemistry Union 10th Ncert Chemistry Union case of endothermic reactionsthe reaction absorbs heat from the unlon.

Chemical reactions are invariably not possible unless the reactants surmount an energy barrier known as the activation energy.

Only then will they be able to make sure that they are getting all the benefits of 10th Ncert Chemistry Union the science stream. Also, the pH scale is mentioned in the best way for students to understand. Point out the correct observation. So 10th Ncert Chemistry Union you read this book completely. Read more. For example: While, in a combination reaction, two or more substances simply combine to form 10th Ncert Chemistry Union 10th Ncert Chemistry Union a new substance.

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