CBSE > Class 09 > Science | CBSE Board | Homework Help

A substance that has a fixed chemical composition throughout is called a pure substance. A pure substance does not have to be of a single element or compound.

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Define amu❓

Posted by Sumesh Sharma 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Riksita Bhat 3 years, 2 months ago

Atomic mass unit

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Sanket Kumar 3 years, 2 months ago

Atomic mass unit

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Rajat Bhatt 3 years, 2 months ago

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Satyam Kumar 3 years, 2 months ago

Amu means. Atomic mass unit.

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Kunal Behl 3 years, 2 months ago

a.m.u is atomic mass unit. amu is a mass of 1/12th of mass of carbon atom. a.m.u is used for calculation ? at atomic level.

1 amu = 1/12 mass of Carbon atom = mass of 1 hydrogen atom

1 a.m.u = 1.6605 x 10^-24gms

Note: a.m.u is just another unit to measure very small masses at atomic level or mass of atoms

Measuring mass of atoms in grams is actually tiresome & amu actually makes calculation ? simpler

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Define proton

Posted by Sanket Kumar 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Riyanshi ... 3 years, 2 months ago

I came back for u sanket

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Muzammil Muzammil 3 years, 2 months ago

Proton is proton which is proton

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Sanket Kumar 3 years, 2 months ago

Define how are you ?☺️

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Riyanshi ... 3 years, 2 months ago

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Sanket Kumar 3 years, 2 months ago

Anyone online ? ?

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define Electron

Posted by Sanket Kumar 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Satyam Kumar 3 years, 2 months ago

Electron is a negatively charged particle present in all atoms

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Sanket Kumar 3 years, 2 months ago

Bolo diksha ?

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Riyanshi ... 3 years, 2 months ago

Yes actually I want to confess something to you...sanket...its personal but I have to confess it on this app only

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Sanket Kumar 3 years, 2 months ago

Diksha how are you ?☺️

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Sanket Kumar 3 years, 2 months ago

Finally Anshika , priya and Rajat ? Diksha come back ????

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Electrons

Posted by Rajat Bhatt 3 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Kunal Behl 3 years, 2 months ago

ELECTRONS are negatively charged subatomic particles.

Relative Charge on 1 electron = -1 (1.6 x 10^-19 C= absolute charge)

Mass of electron = 1/1840 a.m.u (atomic mass unit)

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Sumesh Sharma 3 years, 2 months ago

Hye are you online

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Sanket Kumar 3 years, 2 months ago

No bro ??

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Rajat Bhatt 3 years, 2 months ago

Bhai sab ne delete kr diya kyaa

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What are the three types of Motion Graphs class 9 ? Please ? answer

Posted by Patel Jiya 3 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Patel Jiya 3 years, 2 months ago

Thanks alot

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Hansika Singariya 3 years, 2 months ago

There are three types of graphs? 1. Position-time graph( x-t) 2. Velocity-time graph ( v-t) 3. Acceleration-time graph(a-t) I hope now you can understand it.?

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Namandeep Singh ? 3 years, 2 months ago

Velocity time graph, displacement time graph, distance time graph, acceleration time graph

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Sumesh Sharma 3 years, 2 months ago

Velocity time graph, distance time graph, acceleration time graph

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Drawing of dicot stem

Posted by Thamarai.S Ix-A2 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Preeti Dabral 3 years, 2 months ago

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Derive Velocity - time relation graphically

Posted by Meghashree S 3 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Satyam Kumar 3 years, 2 months ago

I love u sanket u left me why u know na u are my jaan then why u left me btt till I love u plz cone back and left that churail diksha she is not good plzz come back ....

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Sanket Kumar 3 years, 2 months ago

Equation for Velocity-Time relation by graphical method: First equation of Motion. Let an object is moving with uniform acceleration. ... Draw a line parallel to x-axis DA from point, D from where object starts moving. Draw another line BA from point B parallel to y-axis which meets at E at y-axis.

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Difference between atomic and molecular mass

Posted by Sumesh Sharma 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Sanket Kumar 3 years, 2 months ago

Ha mein aapko number de sakta ho ok ??

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Sanket Kumar 3 years, 2 months ago

Anshika hm jane ki baat isliye kr rhe hai kyuki diksha gyi I don't know what reason phir anisha uska boyfriend phir aap bhi ja rhe ho I don't know what reason phir Priya bhi ja rhi hai ??? isliye mein bhi ja raha ho

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Sanket Kumar 3 years, 2 months ago

Koi baat nahi Anshika just chill ? mein number do kya If you like

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Hyy

Posted by Sumesh Sharma 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sanket Kumar 3 years, 2 months ago

Hi sorry mein nhi aa paya mein so gya tha ?????

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Chapter 1 matter surrounding question answer

Posted by Khushpreet Kaur 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Master Jd 3 years, 2 months ago

The answers of "Matter in our surroundings" are there in this app only

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Define xylem

Posted by Ankur Kumar 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sanket Kumar 3 years, 2 months ago

Priya so sorry ok kbhi nhi bolyunga ok ?

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2as= v² + whose square ⬛

Posted by Rajat Bhatt 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Rajat Bhatt 3 years, 2 months ago

Ab tell me whose parents knows that we chat in this app❓❓ instead of studying

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Rajat Bhatt 3 years, 2 months ago

Me from kV Rk puram ( delhi )

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Sanket Kumar 3 years, 2 months ago

No Sarvodaya bal vidyalaya delhi

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Rajat Bhatt 3 years, 2 months ago

Or which school u r from

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Rajat Bhatt 3 years, 2 months ago

Who is there from( kendriya vidyalaya )

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H20

Posted by Rajat Bhatt 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Rajat Bhatt 3 years, 2 months ago

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Sanket Kumar 3 years, 2 months ago

Aap sbne le liye mje ??

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Sanket Kumar 3 years, 2 months ago

Kya yr tum log social media pe yehi baat krne aate ho literally bhai kasam se nhi hai yr ???????

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Rajat Bhatt 3 years, 2 months ago

Chinta mat kr yrrr we r friends hm tumse maje nhi le skte

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Rajat Bhatt 3 years, 2 months ago

Koi bat nhi afwah hai ud gyi

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Acetone

Posted by Rajat Bhatt 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Rajat Bhatt 3 years, 2 months ago

Are FF me bta diyo kaun ha ab kush,???????

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Rajat Bhatt 3 years, 2 months ago

I can read broo

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Sanket Kumar 3 years, 2 months ago

Bhai kasam se ?

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Sanket Kumar 3 years, 2 months ago

Bhai aapse kisne kha meri gf hai

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Rajat Bhatt 3 years, 2 months ago

Bhai sanket jhoot to nhi bol rhe

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Solid carbon dioxide explain krdo koi

Posted by Rajat Bhatt 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Rajat Bhatt 3 years, 2 months ago

Brainly se dekh liya thanks

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Rajat Bhatt 3 years, 2 months ago

Abeee ans batado

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Sanket Kumar 3 years, 2 months ago

Sanket you say that I am your best friend and you didn't even tell me me about your gf...yrr ??? are bhai nhi hai kisne kha Anshika ne kha hoga to majak mein yr literally I have no girlfriend yr no no ????

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Rajat Bhatt 3 years, 2 months ago

*explain

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Rajat Bhatt 3 years, 2 months ago

Plzz explained parso exam h

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Solid CO2

Posted by Rajat Bhatt 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Rajat Bhatt 3 years, 2 months ago

Yes Anisha ji is right ( naughty boy!!)??

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Riyanshi ... 3 years, 2 months ago

Where are you man....come back sanket ..

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Riyanshi ... 3 years, 2 months ago

Sanket you say that I am your best friend and you didn't even tell me me about your gf...yrr

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Rajat Bhatt 3 years, 2 months ago

But she would be very lucky and happy too

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Rajat Bhatt 3 years, 2 months ago

Congo sanket!!! Kya Anisha ji sach kah rahi hai tha u hv a gf literally not fair yrrr

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What do you mean by semi autonomous cell organelles

Posted by Riyanshi ... 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Sanket Kumar 3 years, 2 months ago

Hi listen I am not a naughty boy riyanshi ??

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Sanket Kumar 3 years, 2 months ago

No riyanshi I have not gf yr kisne kha aapkse ?

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Satyam Kumar 3 years, 2 months ago

Semi autonomous organelles means that these organisms have some of their own DNA and ribosomes and they can synthesise their own proteins.......

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Riyanshi ... 3 years, 2 months ago

And sanket you didn't tell me that u have a gf...not fair haa....I am very upset bcs of this...u don't even tell me

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Riyanshi ... 3 years, 2 months ago

Anshika I want to talk to you...I was missing you a lot... but now no more I am going to use this app...just for few days only...then I will uninstall it

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How many type of particles does a pure substance contain?

Posted by Dhruva Patel 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Trisha Verma 3 years, 2 months ago

Only one kind

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Ashlin . T 3 years, 2 months ago

one kind Pure Substance: The substances that are free from any kind of mixture and contain only one kind of particle are pure substances. Examples of pure substances include iron, aluminum, silver, and gold. Mixtures: Substances that have two or more different particles are mixtures.

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Sumesh Sharma 3 years, 2 months ago

Pure?

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a boy walks from a to f along the side of a hexagon of side 10m find the distance traveled by him and the magnitude of his displacement

Posted by Viji Sivakumar 3 years, 2 months ago

CBSE > Class 09 > Science

0 answers

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boiling points of diethyl ether

Posted by Rajat Bhatt 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Ankur Kumar 3 years, 2 months ago

diethyl ether what is this write correct spelling

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Rajat Bhatt 3 years, 2 months ago

Plzz tell me where is the mistake kyuki mene copy kiya tha

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Ankur Kumar 3 years, 2 months ago

In question your spelling mistake is there write correct questions

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What is the atomic structure theory of sir William crooks

Posted by Aryan Raj 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sumesh Sharma 3 years, 2 months ago

discovered the element thallium and show there is a negative charge in atoms.

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What is the difference between plasma membrane and cell membrane?

Posted by Bhuvanisha Murugan 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Goku Super Saying God Kakarot 3 years, 2 months ago

Is this enough

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Goku Super Saying God Kakarot 3 years, 2 months ago

Plasma membrane .it surrounds only the cell organelles. .it does not regulate the tonicity of the cell. .it is not a cell signalling

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Goku Super Saying God Kakarot 3 years, 2 months ago

Cell membrane .It surrounds the entire components of the cell. .It regulates the tonicity of the cell . .cell membrane can be transformed to stimulate movement and feeding in organism such as paramaecium

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Tell me about sagittarius A star and andromeda, laniakea supercluster

Posted by Bjj Ghh 3 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Bjj Ghh 3 years, 2 months ago

Intelligence is not about reading book. Just take knowledge out of this book through universe. Bookish knowledge does not work for long.

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Sumesh Sharma 3 years, 2 months ago

But maine science mai ye naam phele hi sunna, sorry I don't know

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write the difference between xylem and phleom

Posted by Padma Sandhu 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 2 months ago

Xylem	Phloem
Definition
Xylem tissues are the tubular-shaped structure, with the absence of cross walls. This tissue resembles the shape of a star.	Phloem tissues are tubular-shaped, elongated, structures with the presence of walls with thin sieve tubes.
Location
It is located in the centre of the vascular bundle.	It is located on the outer side of the vascular bundle.
Fibres
Xylem fibres are smaller.	Phloem fibres are larger.
Found In
They are present in roots, stems and leaves.	They are present in stems and leaves, which later transports and grow in roots, fruits and seeds.
Movements
These tissues move in a Unidirectional. (only in one direction – upward direction)	These tissues move in a Bidirectional. (both ways – up and down)
Comprises
They live with hollow dead cells.	They live with cytoplasm without the nucleus.
No of Tissues
The total amount of xylem tissue is more.	The total amount of phloem tissue is less.
Features
It consists of tracheids, vessel elements, xylem parenchyma, xylem sclerenchyma and xylem fibres.	It consists of four elements: companion cells, sieve tubes, bast fibres, phloem fibres, intermediary cells and the phloem parenchyma.
Functions
Transports soluble mineral nutrients and water molecules from the roots to the aerial parts of the plant.	Transports food and other nutrients including sugar and amino acids from leaves to storage organs and growing parts of the plant.
Vascular Bundles
Forms vascular bundles with phloem.	Forms vascular bundles with xylem.
Functions
Provides mechanical strength to the plant and helps in strengthening the stem.	Translocates the synthesized sugars by the photosynthetic areas of plants to storage organs like roots, bulbs and tubers.
Functions
It is responsible for replacing the total amount of lost water molecules through transpiration and photosynthesis.	It is responsible for transporting proteins and mRNAs throughout the plant.