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Before we get to know why water is called compound? first we know what is compound. a compound is a substance made up of two or more elements chemically combined in a fixed proportion by mass. Water H2O is a compound made up of two elements hydrogen and oxygen chemical compound in a fixed proportion of 1:8 by mass datomic mass( H=1,o=16)

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I did not understand the lesson of physics can you please explain me

Posted by Meghana Acharya 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Nikhil Dubey 7 years, 6 months ago

Which lessons

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What did you know about 'fluid mosaic model of plasma membrane '

Posted by Nikhil Dubey 7 years, 6 months ago

CBSE > Class 09 > Science

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What is cemical eqation and define The qusetion

Posted by Yuvraj Rao 7 years, 6 months ago

CBSE > Class 09 > Science

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Prive that F =MA

Posted by Student Student 7 years, 6 months ago

CBSE > Class 09 > Science

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Define Three Laws Of Motion

Posted by Dev Rao 7 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Satyansh Sarangi 7 years, 6 months ago

The first law of motion is whenever a body is in motion it will be in motion or whenever the more what is in rest it will be in rest until or unless the force is not applied the second law of motion is that the force is directly proportional to the change in momentum per unit time and the last and third law of motion is that every action is equal and opposite of the reaction

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Rahul Soni 7 years, 6 months ago

Thirth law of motion states that every action has equal and opposite reaction

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Define first laws of motion?

Posted by Aashu Behl 7 years, 6 months ago

CBSE > Class 09 > Science

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Nikhil Dubey 7 years, 6 months ago

According to the first law of motion 'If the body is in rest it remain rest and if the body is in motion it continue at motion until and unless any external force will not apply on it

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Student Student 7 years, 6 months ago

According to first law of motion or Newton .a body will continue its state of rest or motion until there is any external force applied on body.

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What is acceleration? It's SI unit of acceleration

Posted by Aashu Behl 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Student Student 7 years, 6 months ago

It is rate of change of velocity per unit time taken. SI unit m/s*2

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What is interia?

Posted by Neha Panwar 7 years, 6 months ago

CBSE > Class 09 > Science

6 answers

Anshika Prakash 7 years, 6 months ago

The inability of any object to change its state of rest or of Uniform motion along a straight line is called inertia.

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Nikhil Dubey 7 years, 6 months ago

Property of any object due to which the object opposes any change in its state of rest or motion

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Nityam Ayush 7 years, 6 months ago

The tendency of rubstance that resist any change in its state of motion or rest is called inertia.

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Dev Rao 7 years, 6 months ago

Inertia is like a hidden force that opposes force on opposite side of motion

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Harshini Venkatesh 7 years, 6 months ago

The tendancy to oppose the change in motion is called inertia

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Suruchi Saini✌️✌️ 7 years, 6 months ago

The tendency of the body to resist any change in its state is K/A(known as) inertia.

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Prove v square = u square +2as

Posted by Jahanavi Pandey 7 years, 6 months ago

CBSE > Class 09 > Science

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What is a nutrients

Posted by Janvi Khulbe 7 years, 6 months ago

CBSE > Class 09 > Science

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What is a sedimenteri

Posted by Janvi Khulbe 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 6 months ago

Sedimentary rocks are formed by the deposition and subsequent cementation on the material at the Earth’s surface within the bodies of water. These rocks are formed by four ways – deposition of weathered remains of other rocks, accumulation and the consolidation of sediments, deposition of the results of biogenic activity and lastly from precipitation from solution. Some common types of sedimentary rocks – limestone, chalk, clay, sandstone, and shale. These rocks cover 75% of the total earth’s surface.

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If we put some acetone,petrol,etc. On our hand , we feel cool .Why????????

Posted by Himanshi Chaudhary 7 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Dev Rao 7 years, 6 months ago

This is due to latent heat present in petrol or acetone

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Suruchi Saini✌️✌️ 7 years, 6 months ago

If we put some acetone or petrol on our hand , it evaporates. During evapouration, particles of liquid absorb energy from the surroundings or the surface of the hand to compensate for the loss of energy, making the surrounding cool. Hence our hand feel cool.

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Bhavya Singh 7 years, 6 months ago

if we put acetone or petrol on our hand we feel the surface of hand cool because it gains energy and evaporates .thus,this makes surface cool

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Ansh Kumar 7 years, 6 months ago

if we put some acetone or petrol we feel cool because when it evapourates and our body has heat in it so we feel cool

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What is the significance of latitudinal extent of India

Posted by Shulabh Tiwari 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Sonali Aggarwal 7 years, 6 months ago

The latitudinal extent of India is 8 degree 4'28" N to 37 degree 17'53"N. The importance of this vast latitudinal extent is :

It helps in receiving monsoon from the southern part of india which lies in the warm tropical zone.

In the northern part are the Himalayas which are the source of rivers to solve the problem of water scarcity in northern part of india.

It influences the duration of day and night.As we move towards the north nights become longer and days are shorter.

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What is the meaning of term pteridophta

Posted by Shiza Javed 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 6 months ago

Pteridophytes represent an intermediate position between bryophytes and spermatophytes. The Pteridophytes include horsetails and ferns. The pteridophytes are found in cool, damp, shady places though some may flourish well in sandy soil conditions. In pteridophytes, the main plant body is a sporophyte which is differentiated into true root, stem and leaves.

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Write the name of two cell organelles which have their own genetic material.

Posted by Aashu Behl 7 years, 6 months ago

CBSE > Class 09 > Science

6 answers

Ilma Parvez 7 years, 6 months ago

Mytrochondria n plastids hace their own genetic material...

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Bhavya Singh 7 years, 6 months ago

mitochondria and plastids

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Anshika Prakash 7 years, 6 months ago

Mitochondria and Chloroplast

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📕Queen 📕Queen 7 years, 6 months ago

Plastids

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📕Queen 📕Queen 7 years, 6 months ago

Mitrochondria Plaatids

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Tushar Sharma 7 years, 6 months ago

1) Mitochndria 2) Lysosomes

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A solution contains 40g of common salt in 320g of water. Calculate the concentration of the solution (mass by %)

Posted by Aashu Behl 7 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Aashu Behl 7 years, 6 months ago

Mass of solute =40g Mass of solvent =320g Add = total mass of solute + mass of solvent Total =320+40 Total =360 Mass of percentage =mass of solute ×100 Total mass of solute and solvent = 40 ×100 360 Mass of percentage =11.1% Is a right answer

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Dev Rao 7 years, 6 months ago

1)Mitochondria ,2) Plastids easy one

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Bhavya Singh 7 years, 6 months ago

mass of the solute equal to 40 gram and mass of solvent equal to 320 gram mass of solution equal to 320 + 40 equal 4 hundred grams . concentration equal to mass of solute/mass of solution× 100 concentration equal to40 upon 400 × 100 =10 %

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Tanya Savlani 7 years, 6 months ago

360g

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Shiza Javed 5 years, 11 months ago

Uwhsisnebsuwbsjnsuznejdne

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Identity from following physical and chemical and classify according. (1)growth of plant (2)rustling of iron (3)cooking of food (4)freezing of water (5)digestion of food

Posted by Aashu Behl 7 years, 6 months ago

CBSE > Class 09 > Science