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→ Matter around us is present in the form of elements, compounds and mixtures.

→ Elements are substances containing atoms of only one type. E.g., Na, Mg, Au, etc.

→ There are 118 elements known to us. All these have different properties.

→ To make the study of these elements easy, these elements have been divided into few groups in such a way that elements in the same group have similar properties.

Periodic Classification of Elements |Reduced Syllabus 2021

Periodic classification of elements: Need for classification, early attempts at classification of elements (Dobereiner’s Triads, Newland’s Law of Octaves, Mendeleev’s Periodic Table), Modern periodic table, gradation in properties, valency, atomic number, metallic and non-metallic properties.

Periodic Classification of Elements |Deleted Syllabus 2021

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 Compounds are of two types:
(i) Organic Compounds
(ii) Inorganic Compounds

→ Organic Compounds are made up of Carbons and form the basis of all living organisms.
The Covalent Bond

→ Carbon always forms covalent bond.

→ The bond formed by sharing of electron pair between two atoms are known as covalent atoms.

Carbon & Its Compound Class 10 Ch-4 | Reduced Syllabus 2021

Carbon compounds : Covalent bonding in carbon compounds. Versatile nature of carbon. Homologous series.

Carbon & Its Compound Class 10 Ch-4 | Reduced Syllabus 2021

 Elements can be classified as metals and non-metals on the basis of their properties.

• Examples of some metals are: Iron (Fe), Aluminium (Al), Silver (Ag), Copper (Cu)

• Examples of some non-metals are: Hydrogen (H), Nitrogen (N), Sulphur (S), Oxygen (O)

Metals & Non-Metals class 10 | Reduced Syllabus 2021

Metals and nonmetals: Properties of metals and non-metals; Reactivity series; Formation and properties of ionic compounds.

Metals & Non-Metals class 10 | Deleted Syllabus 2021

 The sour and bitter tastes of food are due to acids and bases are present in them.

→ Acids are sour in taste and change the colour of blue litmus to red.

→ Litmus solution is a purple dye, which is extracted from lichen. When the litmus solution is neither acidic nor basic, its colour is purple.

→ Other natural materials like red cabbage leaves, turmeric, coloured petals of some flowers such as Hydrangea, Petunia and Geranium, which indicate the presence of acid or base in a solution.

Acid, Base & Salts | Class 10 Ch-2 Chemistry | Reduced Syllabus 2021

Acids, bases and salts: Their definitions in terms of furnishing of H+ and OH- ions, General properties, examples and uses, concept of pH scale (Definition relating to logarithm not required), importance of pH in everyday life; preparation and uses of Sodium Hydroxide, Bleaching powder, Baking soda, Washing soda and Plaster of Paris

Acid, Base & Salts | Class 10 Ch-2 Chemistry | Deleted Syllabus 2021

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→ Most of the substance around us undergoes various changes. Some of these changes are temporary with no new substance being formed. They are called physical changes.

→ In certain other changes the new substance formed in which the reactant or the parent loses its identity to form new substance called product. These changes are permanent changes as we won’t get the reactant back.

Chemical reaction & equation | ch-1 chemistry | reduced syllabus 2021

Chemical reactions: Chemical equation, Balanced chemical equation, implication of a balanced chemical equation, types of chemical reactions : Combination, decomposition, displacement, double displacement, precipitation, neutralization, oxidation and reduction.

Chemical reaction & equation | ch-1 chemistry | Deleted syllabus 2021

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Magnetic Effect of Electric Current – A magnetic field is a force field that is created by magnetic dipoles and moving electric charges, and it exerts a force on other nearby moving charges and magnetic dipoles.

Class 10 Magnetic Effect Of Electric Current Reduced Syllabus 2021

Magnetic effects of current: Magnetic field, field lines, field due to a current carrying conductor, field due to current carrying coil or solenoid; Force on current carrying conductor, Fleming’s Left Hand Rule, Electric Motor, Electromagnetic induction. Induced potential difference, Induced current. Fleming’s Right Hand Rule.

Class 10 Magnetic Effect Of Electric Current Deleted Syllabus 2021

Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell’s equations. 

Class 10 Electricity Reduced Syllabus 2021

Unit IV: Effects of Current

Electric current, potential difference and electric current. Ohm’s law; Resistance, resistivity, Factors on which the resistance of a conductor depends. Series combination of resistors, parallel combination of resistors and its applications in daily life. Heating effect of electric current and its applications in daily life. Electric power, Interrelation between P, V, I and R.

Class Electricity Deleted Syllabus 2021

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CBSE Class 10 Science Notes Chapter 11 Human Eye and Colourful World. Human Eye: working of human eye, Persistence of vision, Power of accommodation of human eye, Defects of vision. The Human Eye: It is a natural optical instrument which is used to see the objects by human beings.

Class 10 Human Eye & Colourful World Reduced Syllabus 2021

Refraction of light through a prism, dispersion of light, scattering of light, applications in daily life.

Class 10 Human Eye & Colourful World Deleted Syllabus 2021

Light rays change direction when they reflect off a surface, move from one transparent medium into another, or travel through a medium whose composition is continuously changing. The law of reflection can be used to understand the images produced by plane and curved mirrors

Class 10 Light- Reflection & Refraction Reduced Syllabus 2021

Unit III: Natural Phenomena 

Reflection of light by curved surfaces; Images formed by spherical mirrors, centre of curvature, principal axis, principal focus, focal length, mirror formula (Derivation not required), magnification.

Refraction; Laws of refraction, refractive index.

Refraction of light by spherical lens; Image formed by spherical lenses; Lens formula (Derivation not required); Magnification. Power of a lens.

Class 10 Light- Reflection & Refraction Deleted Syllabus 2021

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