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Answered on 01 Jun CBSE/Class 10/Science

Asok Kumar P

20 years experience teaching Class 8 to 12 Physics,Chemistry and Mathematics and NEET/JEE/KEAM Coac

Hydrogen gas is obtained Fe+H2SO4-FeSO4+ H2
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Answered on 03 May CBSE/Class 10/Science

Edukendra Classes

For the syllabus, please visit the Jagranjosh education column. The chapter I recommend to start with is SI units, introduction to scalar and vector quantities, periodic table concerning metals and non-metals, cell and life cycle, etc. These are some fundamental topics to make a conceptual base.
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Lesson Posted on 02/12/2020 CBSE CBSE/Class 10 CBSE/Class 10/Science/Unit I: Chemical Substances - Nature and Behaviour/Chemical Reactions and Equations

Class X - CBSE - Science - Chemistry - Lesson 1: Chemical Reactions and Equations

Vidhya T.

I specifically teach Science for STD X CBSE. Have total of 3 years experience in teaching (both online...

Chemical Reactions & Equations Chemical Reactions: change in colour, state, the evolution of gas, change in temperature Chemical Equation: Shorter way, concise & useful instead of using words Representation: Reactions, Products, Arrow Head Skeletal chemical equations: Mg + O2 ->... read more

Chemical Reactions & Equations

Chemical Reactions:

  • change in colour, state, the evolution of gas, change in temperature

Chemical Equation:

  • Shorter way, concise & useful instead of using words
  • Representation: Reactions, Products, Arrow Head [include pressure, temperature, catalyst, etc.]
  • Skeletal chemical equations: Mg + O2 -> MgO
  • Balanced chemical equations: 2Mg + O2 -> 2MgO

Types of Chemical Reactions:

  1. Combination
  2. Decomposition
  3. Displacement
  4. Double Displacement
  5. Redox
  6. Exothermic
  7. Endothermic

Combination:

CaO + H2O -> Ca(OH)2

Ca(OH)2 + CO2 -> CaCO3 + H2O

Decomposition:

  1. Thermal: CaCO3 --heat--> CaO + CO2
  2. Photochemical: AgCl --light--> Ag + Cl2
  3. Electrolysis: H2O --electricity--> H2 + O2

Displacement:

Fe + CuSO4 --> Fe(SO)4 + Cu

Elements of higher reactivity displace elements of lesser reactivity. Fe > Cu

Double Displacement:

Na2(SO)4 + BaCl2 --> BaSO4 + NaCl (this is a precipitation reaction as well)

Redox: Reduction Oxidation

Reduction means the removal of Oxygen (or) addition of hydrogen

Oxidation means the addition of Oxygen (or) removal of hydrogen

2Cu + O2 --heat--> 2CuO [oxidation]

CuO + H2--> Cu + H2O [reduction CuO to Cu, oxidation H2 to H2O]

Exothermic:

Burning of natural gas

CH4 + O2 --> CO2 + H2O

Respiration

C6H12O6 + O2 --> CO2 + H2O + energy

Endothermic:

ZnCO3 + Heat absorbed --> ZnO + CO2

Effect of Chemical Reactions:

Corrosion:

  • undesirable change that occurs in metals in the presence of moisture, acids, bases & air
  • Fe + H2O --> Fe2O3.nH2O

Rancidity:

  • undesirable change that takes place in oil-containing food
  • Chips: flushing out with air prevents oxidation of fatty acids.

Tarnishing:

  • Silver reacts with sulphides in the atmosphere (e.g. mercuric sulphide) to form a black layer of silver sulphide.
  • Toothpaste to it to remove the tarnish regains its colour.
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Answered on 03/11/2020 CBSE/Class 10/Science Exam Coaching/Science Olympiad

Sayak Bhattacharya

Calcutta Homeopathy Medical College and Hospital student...I passed my ISC from The Assembly of god

• Artificial Hybridization - in which one can select better parental plants, cross-pollinate them and select among the progenies to get one which will help in increasing the yield or one which will be pest and disease resistant • Genetic Engineering- this branch of modern science is used to... read more

• Artificial Hybridization - in which one can select better parental plants, cross-pollinate them and select among the progenies to get one which will help in increasing the yield or one which will be pest and disease resistant

• Genetic Engineering- this branch of modern science is used to produce genetically modified plants which will be wide yielding variety and will also show resistance to disease and pest

• Scientific Crop Management Practice- Which involves superior irrigation facilities, use of fertilizer containing both micro and macronutrient in an appropriate amount and protecting the crop from pest and insects.

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Lesson Posted on 06/10/2020 CBSE/Class 11/Science/Physics CBSE/Class 10/Science/Unit I: Chemical Substances - Nature and Behaviour/Metals and Non Metals

Electric motor

Sumit Hajela

I am a master degree holder in computer application . I have been teaching home tuition since 2004...

The electric motor is a device that converts electrical energy to mechanical energy. Parts of an Electric Motor Insulated Copper wire: A rectangular coil of wire. Magnet Poles: A magnet as placed above, i.e. the North Pole and the South Pole. This creates a magnetic field, as shown above. Split... read more

The electric motor is a device that converts electrical energy to mechanical energy.

Parts of an Electric Motor

  • Insulated Copper wire: A rectangular coil of wire.
  • Magnet Poles: A magnet as placed above, i.e. the North Pole and the South Pole. This creates a magnetic field, as shown above.
  • Split Rings: Two disjoint C-shaped rings. It acts as a commutator (which can reverse the direction of current)
  • Axle: The split rings are placed on the axle which can rotate freely.
  • Brushes: The outside of the split rings are connected to conducting brushes X and Y.
  • Source Battery: To source current.

The principle of an electric motor:

The electric motor works on the principle of force experienced by a current-carrying conductor in a magnetic field.
Two forces of equal magnitude act in the opposite direction on the two parallel sides of the coil. Since they act along different lines, they cause rotational motion.

Applications

  • Electric Fans
  • Refrigerators
  • Mixers
  • Washing machines
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Lesson Posted on 04/09/2020 CBSE/Class 10/Science/Unit I: Chemical Substances - Nature and Behaviour/Acids, Bases and Salts/NCERT Solutions

Acids

Suranjana

I am a teacher having experience of 19 years, in undergraduate Engineering college. Also I am experienced...

Lavoisier and Davy studied the terms acids bases and salts.Acids: “Acid” word derived from the Latin word “Acidus” means SOUR. Compulsorily have hydrogen H+ is present in the form of H3O+ when dissolved in water. Turns Blue litmus redDefinition:Acids are defined as the compounds... read more

Lavoisier and Davy studied the terms acids bases and salts.
Acids:
 “Acid” word derived from the Latin word “Acidus” means SOUR.
 Compulsorily have hydrogen
 H+ is present in the form of H3O+ when dissolved in water.
 Turns Blue litmus red
Definition:
Acids are defined as the compounds which contain one or more hydrogen atoms and when dissolved in water, produce hydronium ions (H3O+), the only positively charged ions.
Examples: Hydrochloric acid (HCl), Sulphuric Acid (H2SO4), Nitric Acid (HNO3), Acetic Acid (CH3COOH) etc.
According to the ionic theory, an acid is a compound which, when dissolved in water yields hydronium ions (H3O+)as the only positively charged ions.
HCl →  H+ + Cl- (Chloride ion)

H+ + H2O → H3O+ (Hydronium ion or simply H+)

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Lesson Posted on 22/08/2020 CBSE/Class 10/Science

Decade of Sun by physics Passion

Altaf Fakir

I am working as assistant professor of physics. I have completed Post graduation in physics subject....

Decade of Sun
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Answered on 02/07/2020 CBSE/Class 10/Science/Unit I: Chemical Substances - Nature and Behaviour/Chemical Reactions and Equations

P V Rao

I am P V Rao, an experienced educator and teacher with more than 30 years of teaching experience

2O refers to two atoms of oxygen. O2 refers to a molecule of oxygen. Atoms are not stable. So, they combine to form molecules.
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Answered on 24/06/2020 CBSE/Class 10/Science/Unit I: Chemical Substances - Nature and Behaviour/Chemical Reactions and Equations

Manas Kumar Karn

Experienced English spoken and motivational speaker with 100% positive feedback.

It's very controvertial if I say that they might touch each other because they influence each other.
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Answered on 14 Jan CBSE/Class 10/Science Tuition/Class IX-X Tuition

Noor

It is a property of a conductor which opposes the flow of charges through them and two metals which are highly resistant (i) gold and (ii) platinum
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