In year of 1805 K. Chancel, an assistant to a professor Louis Jacques Thenard, Paris invented the modern matchstick. In his invention, the head of the match was coated with potassium chlorate, sugar, sulfur and rubber.

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What type of phosphorus contain by matchstick

Posted by Satyam Singh Rajput 3 years, 9 months ago

CBSE > Class 09 > Science

5 answers

World Wide Handsome💜 3 years, 9 months ago

Red phosphorus

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Mrityunjai Pratap Singh 3 years, 9 months ago

It contain red phosphorus

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Mrityunjai Pratap Singh 3 years, 9 months ago

In year of 1805 K. Chancel, an assistant to a professor Louis Jacques Thenard, Paris invented the modern matchstick. In his invention, the head of the match was coated with potassium chlorate, sugar, sulfur and

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Chandrika Chandrika 3 years, 9 months ago

A kind of red phosphorus is present in matchsticks

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Yogita Ingle 3 years, 9 months ago

The striking surface of the matchbox contains red phosphorus and the head of the matchstick contains potassium chlorate. So when the matchstick is rubbed on the matchbox, some of the red phosphorus is converted to white phosphorus, a chemical i.e. so volatile that it ignites in air.

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State rules of Bohr's and bury

Posted by Mrityunjai Pratap Singh 3 years, 9 months ago

CBSE > Class 09 > Science

2 answers

Vineeth Biradar 3 years, 9 months ago

The distribution of electrons in different orbits or shells is governed by a scheme known as Bohr bury scheme.The arrangement of electrons in various energy levels of an atom is known as the electronic configuration of the atom. According to this scheme. The electrons are arranged around the nucleus in different energy levels or energy shells. The electrons first occupy the shell with the lowest energy i.e., closest to the nucleus. The first or the innermost energy shell (K or n = 1) can take only two electrons. The second shell (L or n = 2) can contain upto 8 electrons. From third shell (M or n = 3) onwards, the shells become bigger. The third shell can accommodate as many as 18 electrons. In general, the maximum number of electrons that can be present in any shell is 2n2 where n is the number of energy shell. Thus, the first orbit (n = 1, known as K shell) can contain 2 × 12 = 2 electrons, the second orbit (n = 2, known as L shell) can contain 2 × 22 = 8 electrons.

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Yogita Ingle 3 years, 9 months ago

The distribution of electrons in different orbits or shells is governed by a scheme known as Bohr bury scheme.The arrangement of electrons in various energy levels of an atom is known as the electronic configuration of the atom. According to this scheme.

The electrons are arranged around the nucleus in different energy levels or energy shells. The electrons first occupy the shell with the lowest energy i.e., closest to the nucleus.
The first or the innermost energy shell (K or n = 1) can take only two electrons.
The second shell (L or n = 2) can contain upto 8 electrons.
From third shell (M or n = 3) onwards, the shells become bigger. The third shell can accommodate as many as 18 electrons. In general, the maximum number of electrons that can be present in any shell is 2n² where n is the number of energy shell. Thus, the first orbit (n = 1, known as K shell) can contain 2 × 1² = 2 electrons, the second orbit (n = 2, known as L shell) can contain 2 × 2²= 8 electrons.

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State rules of Bohr's and bury. Draw diagram indicating the distribution of electrons in the atom of the elements having atomic number 9,16,19.Give the names and symbols of these elements

Posted by Mrityunjai Pratap Singh 3 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 3 years, 9 months ago

The electrons are arranged around the nucleus in different energy levels or energy shells. The electrons first occupy the shell with the lowest energy i.e., closest to the nucleus.
The first or the innermost energy shell (K or n = 1) can take only two electrons.
The second shell (L or n = 2) can contain upto 8 electrons.
From third shell (M or n = 3) onwards, the shells become bigger. The third shell can accommodate as many as 18 electrons. In general, the maximum number of electrons that can be present in any shell is 2n²where n is the number of energy shell. Thus, the first orbit (n = 1, known as K shell) can contain 2 × 1² = 2 electrons, the second orbit (n = 2, known as L shell) can contain 2 × 2² = 8 electrons.

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valancy of 2

Posted by Tej Pratap Singh Rajput 3 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Poonam Gujjar 3 years, 9 months ago

Valency no. 0

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The valency of an element 'X' is 2. Write the formulae of the oxide,chloride and hydroxide formed by 'X'.

Posted by Amrita Ks 3 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Arpita Panigrahy 3 years, 9 months ago

For oxide : XO For chloride :XCl2 For hydroxide : X(OH)2

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NAME all states of matter

Posted by Prashant The Great 3 years, 9 months ago

CBSE > Class 09 > Science

5 answers

Satyam Kumar 3 years, 9 months ago

1. Solid 2. Liquid 3. Gas 4. Plasma 5. BEC

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Mrityunjai Pratap Singh 3 years, 9 months ago

The all states of matter are (a)solid (b) liquid (c) gas

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Aditya Kr 3 years, 9 months ago

solid, liquid ,gas, plasma, bose einsten condencate

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Sham Bhardwaj 3 years, 9 months ago

1. Solid 2.Liquid 3. Gas

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Yogita Ingle 3 years, 9 months ago

There are three states of matter – solid, liquid and gas.

Solid: Matters which have fixed volume and shape are called solids. For example - stone, wood, brick, ice, sugar, salt, coal, etc. All metals are solid except mercury and gallium.

Liquid: Matters which have fixed volume but indefinite shape are called liquids. For example - milk, water, petrol, kerosene, alcohol, oil, etc. Since liquid can flow, it is also called fluid.

Gas: Matters which have indefinite shape and volume are called gases. For example - air, oxygen, hydrogen, nitrogen, carbon-dioxide, etc.

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How many ions 1 mole of a compound contains

Posted by Insha Maqbool 3 years, 9 months ago

CBSE > Class 09 > Science

3 answers

Arpita Panigrahy 3 years, 9 months ago

1 mole of a compound contains 6.022×10²³ ions .

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Vineeth Biradar 3 years, 9 months ago

One

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Manish Nagar 3 years, 9 months ago

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Name all the states of matter?

Posted by Zaid . 3 years, 9 months ago

CBSE > Class 09 > Science

5 answers

Prathmesh Galphade 3 years, 9 months ago

Matter has almost three states they are solid , liquid,and gas Solids have tightly packed molecules ,liquid have less packed molecules ,and gases have freely moveable molecules ?

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Zaid . 3 years, 9 months ago

No. There are 7 states of matter solid, liquid, gas, plasma, Bose Einstein condensate, fermionic condensate, and quack gulion plasma.

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Kripa Daga 3 years, 9 months ago

Solid, Liquid and Gas

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Chasmish 40 3 years, 9 months ago

Solid: Matters which have fixed volume and shape are called solids. For example - stone, wood, brick, ice, sugar, salt, coal, etc. All metals are solid except mercury and gallium. Liquid: Matters which have fixed volume but indefinite shape are called liquids. For example - milk, water, petrol, kerosene, alcohol, oil, etc. Since liquid can flow, it is also called fluid. Gas: Matters which have indefinite shape and volume are called gases. For example - air, oxygen, hydrogen, nitrogen, carbon-dioxide, etc.

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Yogita Ingle 3 years, 9 months ago

There are three states of matter – solid, liquid and gas.

Solid: Matters which have fixed volume and shape are called solids. For example - stone, wood, brick, ice, sugar, salt, coal, etc. All metals are solid except mercury and gallium.

Liquid: Matters which have fixed volume but indefinite shape are called liquids. For example - milk, water, petrol, kerosene, alcohol, oil, etc. Since liquid can flow, it is also called fluid.

Gas: Matters which have indefinite shape and volume are called gases. For example - air, oxygen, hydrogen, nitrogen, carbon-dioxide, etc.

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On Moon’s surface acceleration due to gravity is 1.67 m/s2 .If radius of moon is 1.74×106 m. Calculate the mass of moon.

Posted by Sharmaji Vinodbhai 3 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 3 years, 9 months ago

Given :

m = mass of moon

We know that,

The required mass of moon is

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ANSWER

Deleted portion of science for ncert

Posted by Aastha Bhurani 3 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Bhumika Jaiswal 3 years, 8 months ago

Matter in our surrounding , Diversity in living organisms , Sound , Improvement in food resources.

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What are the three laws of Kepler's ??

Posted by Swati Gupta 3 years, 9 months ago

CBSE > Class 09 > Science

2 answers

Tamanna Pant 3 years, 9 months ago

Yogita ingle you are a teacher

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Yogita Ingle 3 years, 9 months ago

According to Kepler’s first law,” All the planets revolve around the sun in elliptical orbits having the sun at one of the foci”. The point at which the planet is close to the sun is known as perihelion and the point at which the planet is farther from the sun is known as aphelion.

Kepler’s second law states ” The radius vector drawn from the sun to the planet sweeps out equal areas in equal intervals of time”

According to Kepler’s law of periods,” The square of the time period of revolution of a planet around the sun in an elliptical orbit is directly proportional to the cube of its semi-major axis”.

T² ∝ a³

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How inertia different from mass ??

Posted by Swati Gupta 3 years, 9 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Cellulose is a type of what ??

Posted by Swati Gupta 3 years, 9 months ago

CBSE > Class 09 > Science

3 answers

Satyam Kumar 3 years, 9 months ago

Cellulose is a kind of carbohydrates found in green plants.

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Sameer Singh 3 years, 9 months ago

Cellulose is a polysaacharide consisting of a linear chain of several hundred to over ten thousand glucose units. Cellulose is the structural component of the primary cell wall of green plants and many algae. Diffusion is the spontaneous movement of molecules such as oxygen, carbon dioxide etc. from a region of higher concentration to a region of lower concentration.

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Yogita Ingle 3 years, 9 months ago

Cellulose is a polysaacharide consisting of a linear chain of several hundred to over ten thousand glucose units.

Cellulose is the structural component of the primary cell wall of green plants and many algae.

Diffusion is the spontaneous movement of molecules such as oxygen, carbon dioxide etc. from a region of higher concentration to a region of lower concentration.

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ANSWER

Who discovered ION ?

Posted by Swati Gupta 3 years, 9 months ago

CBSE > Class 09 > Science

2 answers

Arpita Panigrahy 3 years, 9 months ago

Michel Faraday

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Aᴍʀɪᴛ Aʀʏᴀ 3 years, 9 months ago

Hiiiiii

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ANSWER

a rocket is moving up with a velocity v if the velocity of this rocket is suddenly tripled .what will be the ratio of two kinetic energy?

Posted by Rohan King 3 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Arpita Panigrahy 3 years, 9 months ago

1:9

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ANSWER

What is the work of Joule ?

Posted by Pragya Verma 3 years, 9 months ago

CBSE > Class 09 > Science

3 answers

Aishwarya Satish 3 years, 9 months ago

1N × 1m

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Suresh Chaudhary 3 years, 9 months ago

It is the SI unit of kinetic energy.

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Gaurav Seth 3 years, 9 months ago

Joule is the SI unit of work. 1 Joule is amount of work done when a force of 1 Newton displaces a body through a distance of 1m in the direction of the force applied.

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ANSWER

What is mass percentage of a solution?

Posted by Harpreet Singh Harry 3 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 3 years, 9 months ago

Mass percentage of a solution is a method to express the concentration or the amount of a component present in a given quantity of solution. The mass percentage of a component in a solution is defined as the mass of solute present per 100 grams of the solution

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ANSWER

Term tissue in simple language

Posted by Ritika Ghuge 3 years, 9 months ago

CBSE > Class 09 > Science

3 answers

Prateek Maliwal 3 years, 9 months ago

Group of cells that are similliar in structure and perform the same function is called a tissue .

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Chasmish 40 3 years, 9 months ago

roup of cells similar in structure and they are specialized to perform particular function like muscle cells in our body forms the muscle tissue that bring about body movements.

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Gaurav Seth 3 years, 9 months ago

Tissues are groups of cells that work together to do a job in the body.

Group of cells which are similar in structure that work together to achieve a particular function forms a tissue.

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Is there any difference between speed and velocity?

Posted by Zaid . 3 years, 9 months ago

CBSE > Class 09 > Science

2 answers

Ritika Ghuge 3 years, 9 months ago

Speed being a scalar quantity... Velocity is a vector quantity

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Yogita Ingle 3 years, 9 months ago

Sl. No.	Differentiating Property	Velocity	Speed
1	Definition	Velocity can be defined as the rate at which an object changes position in a certain direction.	The rate at which an object covers a certain distance is known as speed.
2	Type of quantity	Vector quantity	Scalar quantity
3	Magnitude	Velocity can be zero, negative, or positive.	Speed can never be negative or zero.
4	Change of direction	The velocity of the object changes with the change in direction, therefore the object must follow one direction.	The average speed will continue to count even if the object changes direction.
5	Interrelation	An object may possess different velocities but the same speed.	Speed may or may not be equal to velocity.

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ANSWER

SI unit of gravity

Posted by Hareshwari Mori 3 years, 9 months ago

CBSE > Class 09 > Science

5 answers

Aishwarya Satish 3 years, 9 months ago

ms‐²

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Ritika Ghuge 3 years, 9 months ago

SI unit of gravity is NEWTON KGs

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Nitin Singh 3 years, 9 months ago

Newton

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Yogita Ingle 3 years, 9 months ago

Gravity is a force that attracts a body towards the centre of the earth, or towards any other physical body having mass.

Nm2Kg−2 is the SI unit of gravitational constant G

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Zaid . 3 years, 9 months ago

The SI unit of gravity is Newton

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What is the meaning of alloys

Posted by Hardik Pandey 3 years, 9 months ago

CBSE > Class 09 > Science

3 answers

Satyam Kumar 3 years, 9 months ago

A homogeneous mixture of metals which is made from a process of melting. Ex - brass.

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Yogita Ingle 3 years, 9 months ago

An alloy is a substance made by melting two or more elements together, at least one of them metal. An alloy crystallizes upon cooling into a solid solution, mixture, or intermetallic compound. The components of alloys cannot be separated using a physical means. An alloy is homogeneous and retains the properties of a metal, even though it may include metalloids or nonmetals in its composition.

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Rohit Kirtania 3 years, 9 months ago

Alloys are homogeneous mixture. They may also be regarded as solid in solid solutions.

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Write a short note on manure

Posted by Swati Maity 3 years, 9 months ago

CBSE > Class 09 > Science

2 answers

Satyam Kumar 3 years, 9 months ago

Manure is a natural fertilizer made from decomposition of decomposible products like plants , peels of fruits and vegetables etc.

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Yogita Ingle 3 years, 9 months ago

Manures are natural fertilizers. They are bulky sources of organic matter which supply nutrients in small quantities but organic matter in large quantities.
Manures are prepared by the decomposition of animal excreta and plant waste. Manures include farmyard manure (FYM), compost, green manure etc.

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ANSWER

Who is newton, and what is newton's atomic vision

Posted by Shreyas Daundkar 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 5 months ago

Newton's Principia contained a science of mechanics that was able to withstand experimental tests in a demanding way. Newton also articulated and defended an atomic theory of the ultimate structure of matter. His atoms bore the marks of his science insofar as inertia was attributed to them.

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What do you understand by Absolute Zero temperature?

Posted by Zaid . 3 years, 9 months ago

CBSE > Class 09 > Science

3 answers

Yogita Ingle 3 years, 9 months ago

Absolute zero is the lower limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reaches its minimum value, taken as 0. The Kelvin scale is an absolute, thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.

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Shreyas Daundkar 3 years, 9 months ago

Zaid did you get your answer

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Shreyas Daundkar 3 years, 9 months ago

Absolute zero temperature at which thermodynamic system has the lowest energy. It corresponds to -273.15^o celcius on Celsius scale

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Can anyone give Structure of atoms notes . please

Posted by Hello Hai 3 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 3 years, 9 months ago

Contribution to the Atomic theory Timeline

More than 2400 years ago, he named the smallest piece of matter “ATOMOS,” meaning “not to be cut.”
Atoms were small, hard particles that were all made of the same material but were different shapes and sizes.
Atoms were infinite in number, always moving and capable of joining together

Dalton’s Atomic theory:

First recorded evidence that atoms exists.
Using his theory, Dalton rationalized the various laws of chemical combination

Click on the given link for notes:

<a data-ved="2ahUKEwiOs9HY4_DtAhXbR30KHV_KBoEQFjAAegQIBBAC" href="https://mycbseguide.com/blog/structure-atoms-class-9-notes-science/" ping="/url?sa=t&source=web&rct=j&url=https://mycbseguide.com/blog/structure-atoms-class-9-notes-science/&ved=2ahUKEwiOs9HY4_DtAhXbR30KHV_KBoEQFjAAegQIBBAC" rel="noopener" target="_blank">Structure of the Atoms class 9 Notes Science | myCBSEguide ...</a>

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When a force is exerted on an object it can change its

Posted by Deepak Tewatia 3 years, 9 months ago

CBSE > Class 09 > Science

5 answers

Zaid . 3 years, 9 months ago

Potision

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Zaid . 3 years, 9 months ago

Potion

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Dipankar Kumar 3 years, 9 months ago

Position

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A. Ragavendran 3 years, 9 months ago

Motion

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Gaurav Seth 3 years, 9 months ago

A force acting on an object causes the object to change its shape or size, to start moving, to stop moving, to accelerate or decelerate. When there's the interaction between two objects they exert a force on each other, these exerted forces are equal in size but opposite in direction.

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ANSWER

If the radius of the earth is decreased by 10% , but it's mass remains same, then what is the percentage change in value of acceleration due to gravity?

Posted by Ayush Upadhyay 3 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 5 months ago

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ANSWER

What is the deleted syllabus of CBSE Class 9

Posted by Vivek Rana 3 years, 9 months ago

CBSE > Class 09 > Science

2 answers

Aishwarya Satish 3 years, 9 months ago

Unit I: Matter-Nature and Behaviour Chapter Topics Matter in Our Surroundings Definition of matter; solid, liquid and gas; characteristics - shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation. Unit II: Organization in the Living World Chapter Topics Diversity in Living Organisms Diversity of plants and animals-basic issues in scientific naming, basis of classification. Hierarchy of categories / groups, Major groups of plants (salient features) (Bacteria, Thallophyta, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms). Major groups of animals (salient features) (Non-chordates upto phyla and chordates upto classes). Unit III: Motion, Force and Work Chapter Topics Floatation Thrust and Pressure. Archimedes’ Principle; Buoyancy; Elementary idea of Relative Density. Sound Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo and SONAR. Structure of the Human Ear (Auditory aspect only). Unit V: Food Production Chapter Topics Improvement in Food Resources Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming.

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Gaurav Seth 3 years, 9 months ago

CBSE Class 9 Science (086) - Deleted portion (Theory):

Unit I: Matter-Nature and Behaviour
Chapter	Topics
Matter in Our Surroundings	Definition of matter; solid, liquid and gas; characteristics - shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.
Unit II: Organization in the Living World
Chapter	Topics
Diversity in Living Organisms	Diversity of plants and animals-basic issues in scientific naming, basis of classification. Hierarchy of categories / groups, Major groups of plants (salient features) (Bacteria, Thallophyta, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms). Major groups of animals (salient features) (Non-chordates upto phyla and chordates upto classes).
Unit III: Motion, Force and Work
Chapter	Topics
Floatation	Thrust and Pressure. Archimedes’ Principle; Buoyancy; Elementary idea of Relative Density.
Sound	Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo and SONAR. Structure of the Human Ear (Auditory aspect only).
Unit V: Food Production
Chapter	Topics
Improvement in Food Resources	Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming.

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ANSWER

Why would cells need oxygen?

Posted by Riya Sharma💜🤞 3 years, 9 months ago

CBSE > Class 09 > Science

2 answers

Ashmita Das 3 years, 9 months ago

Cells need oxygen for the efficient use of glucose in cellular respiration, the main method, most organisms used to gain energy. The oxygen bonds to portions of glucose molecule,releasing water, Carbon dioxide,and energy. The cells then use energy to generate Adenosine Triphosphate (ATP).

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Yogita Ingle 3 years, 9 months ago

Cells need oxygen for the efficient use of glucose in cellular respiration, the main method, most organisms used to gain energy.
The oxygen bonds to portions of glucose molecule,releasing water, Carbon dioxide,and energy.
The cells then use energy to generate Adenosine Triphosphate (ATP).

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