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For writing thee formulas in atoms and molecules how to know where to write velancy and where to write charge???

Posted by Vaibhavi Narvenkar 16 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Palak Gupta 5 years, 2 months ago

The rule for writing chemical formula is as follow: Firstly, write the symbols with positive charge valency first. Secondly, write the valency of each atom on the top of its symbol. Thirdly, divide the valency number by their highest common factor ignore the positive or negative radicle. Hope it is helping you Please give me thanks

ANSWER

what do you mean by 20% concentrated salt solution in water? give 2 points

Posted by Sanjivani Gupta 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

धर्मेंद्र कुशवाह 5 years, 2 months ago

100 ml water+ 20 mg salt

Vanshita Chauhan 5 years, 2 months ago

1.NaCl + H2O → NaOH + HCl 2. We will get acid as well as base

ANSWER

3.Why is topsoil with bare vegetation easily removed? 1

Posted by Sanchita Chatterjee 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yash Tanwar 5 years, 2 months ago

The soil not covered by vegetation (trees and other plants) is easily eroded because there are no roots of trees and plants in it which can bind the soil particles together and prevent them from being carried away by strong winds or flowing rainwater. ... Due to this, soil erosion does not occur.

ANSWER

on heating a mixture of iron filings and sulphur why are we not able to separate iron filings using a magnet

Posted by Sanjivani Gupta 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Aarya Sharma 5 years, 2 months ago

On heating a mixture of iron fillings and sulphur, we are not able to separate iron fillings using a magnet because iron fillings and sulphur have chemically combined with each other on heating therefore forming a compound. That is why we are not able to separate iron fillings using magnet.

4Thank You

ANSWER

A hammer of mass 500 g moving at 50 m s-1 strikes a nail The nail stop the hammer in a very short time 0.01s.what is the force of the nail on the Hammer

Posted by Sukrit Shokeen 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Khushi Kaur 5 years, 2 months ago

Mass of the hammer (m) = 500 g = 0.5 kg The initial velocity of the hammer (u) = 50 m/s Time is taken by the nail to the stop the hammer (t) = 0.01 s The velocity of the hammer (v) = 0 (since the hammer finally comes to rest) From Newton’s second law of motion f = m (v – u) / t Where f = force f = 0.5 × (0 – 50) / 0.01 f = -2500 N

ANSWER

Drawback of Rutherford's model

Posted by Shorya Rawat 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Vanshita Chauhan 5 years, 2 months ago

As per Rutherford’s model, electrons revolve around the nucleus in a circular path. But particles that are in motion on a circular path would undergo acceleration, and acceleration causes radiation of energy by charged particles. Eventually, electrons should lose energy and fall into the nucleus. And this points to the instability of the atom. But this is not possible because atoms are stable. Hence, Rutherford failed to give an explanation on account of this.

Kuldeep Singh 5 years, 2 months ago

Rutherford Can't explain the stability of an atom

ANSWER

Electronic configuration of 20Ca40

Posted by Kartikey Gupta 5 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Parul Ailawadi 5 years, 2 months ago

2,8,8,2

Abdul Bashit 5 years, 2 months ago

K=2,L=8,M=8,N=8

Kuldeep Singh 5 years, 2 months ago

k =2,L=8,M=8,N=8

ANSWER

How can we found salt

Posted by Jd Sharma 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Himanshu Badole 5 years, 2 months ago

You just heat sea water... U will get it

Himanshu Badole 5 years, 2 months ago

Salt can be found in sea water..... Sea water is Rich in salt..

ANSWER

A motorcycle moving with a speed of 5m/ s is subjected to accelerate of 0.2 m/s² .calculate the speed of motorcycle after 10s and distance travelled in this time

Posted by Anushka Singh 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Khushi Kaur 5 years, 2 months ago

1) Given that The initial speed of car=u= 5 m/s Acceleration =a=0.2m/s2 Time=t=10s We need to calculate the distance We know that v = u + at = 5 + 0.2×10 = 5+2 = 7 m/s s = ut + 1/2at² = (5×10) + (1/2)×(2/10)×(10×10) = 50 + 10 = 60 m Final speed = 7 m/s Distance traveled in 10 seconds = 60 m

ANSWER

A train starting from rest attains a velocity of 72 km h-1 in 5 min assuming that the acceleration is uniform find

Posted by Vaishnavi Maske 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Mohit Kumar 5 years, 2 months ago

Find what?

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Who is Ashish Kumar Tandi

Posted by Ashish Kumar Tandi 5 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Define anode, cathode and canal rays.

Posted by Abhishek Singh 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Kuldeep Singh 5 years, 2 months ago

The positively charged rays are card anode rays and the negatively charged rays are called cathode rays

ANSWER

Define uniform motion and non uniform motion

Posted by Shanthosh Kanna 5 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Rimjhim Goswami 5 years, 2 months ago

When an object travels called distance in equal interval of time is known as uniform motion and when it does not travel equal distance with respect to the time is known as non uniform motion

Lawanya Taak 5 years, 2 months ago

Uniform motion is a motion when an object travels equal distance in equal time interval. Uniform motion is a motion when an object travels unequal distance in equal time interval. Thank you.

Yamuna Sharma 5 years, 2 months ago

Uniform motion- When an object travels equal distance in equal interval of time, then it will know as uniform motion. Non-uniform motion- When an object travels unequal distance in equal interval of time, it will be non-uniform motion. Hope you will understand!!!!! @bts_armys_official7 ?✨

3Thank You

ANSWER

Write a short note on plastid ?

Posted by ☆ Pranal Rewatkar ☆ 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Rimjhim Goswami 5 years, 2 months ago

Plastics are responsible for the storage of the food they are of three types chromoplast and leucoplast and chloroplast in which chloroplast is responsible for the green pigment due to which plant appear green and leucoplast are colour less and store carbohydrate and starch chromoplast means colour

Khushi Kaur 5 years, 2 months ago

Plastids are double-membrane organelles which are found in the cells of plants and algae. Plastids are responsible for manufacturing and storing of food. These often contain pigments that are used in photosynthesis and different types of pigments that can change the colour of the cell.

ANSWER

Zaid is moving in his car with a velocity of 45km/h. How much distance he covers in 1 minute and 1 sec

Posted by Zaid . 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Kuldeep Singh 5 years, 2 months ago

We can solve this answer by the formula distance is equal to speed multiply by time

Ankush Ranjan 5 years, 2 months ago

In 1 sec = 12.5metre And in 1 min = 12.5 × 60 = 750 metre

ANSWER

What is the total momentum of a bullet and a gun after firring

Posted by Nishant Prajapati 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Ankush Ranjan 5 years, 2 months ago

ANSWER

Explain any five connective tissues with diagram.

Posted by Mr. Popular Creator 5 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What are photosynthesis

Posted by Jay Darji 5 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Anisha Meher 5 years, 2 months ago

A process in which plants make their own food by using sunlight,water,and air is called photosynthesis

Namit Gupta 5 years, 2 months ago

Process in which plants make their food in the present of chlorophyll

Bharti Meena 5 years, 2 months ago

This is a process by which plants make their own food.

Abhishek Kumar 5 years, 2 months ago

Plant make their own food with the help of photosynthesis

ANSWER

What is the combining capacity of an element called?

Posted by Janvi Gandhi 5 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Anisha Meher 5 years, 2 months ago

Valency

Shivraj Meena 5 years, 2 months ago

Valency

Abhishek Kumar 5 years, 2 months ago

Valency

Yash Yadav 5 years, 2 months ago

Valency

ANSWER

Why the cell called the structural and functional unit of life ?

Posted by ☆ Pranal Rewatkar ☆ 5 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Ankush Ranjan 5 years, 2 months ago

The cell is called the structural and functional unit of life as all living organisms are made up of cells. ... Furthermore, cells provide form and structure, process nutrients and convert it into useable energy. Multicellular organisms have specialized cells that perform specific functions.

Abhishek Kumar 5 years, 2 months ago

Because all cell perform specific structure and function that's why the cell called structure and function unit of life

Priyanshu Kalwaniya 5 years, 2 months ago

Vaishali Yadav 5 years, 2 months ago

ANSWER

A girl of mass 40kg jumps with a horizontal velocity of 5m/s onto a stationary cart with frictionless wheels. The mass of cart is 3kg wha

Posted by Aanya Jain 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Virat Jaat 5 years, 2 months ago

Given : Mgirl=40 kg ugirl=5 m/s Mcart=3 kg Initial velocity of cart ucart=0 Let the final velocity of cart be V. Applying conservation of linear momentum : Pi=Pf Or Mgirlugirl+Mcartucart=(Mgirl+Mcart)V Or 40×5+3×0=(40+3)V ⟹ V=43200 m/s

ANSWER

What is the soluble

Posted by Luckygupta Gupta 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Anisha Meher 5 years, 2 months ago

Substances that dissolve in water are called soluble substances. When you mix sugar with water, the sugardissolves to make a transparent solution. Salt is soluble in water too.

Koyya Vamsi 5 years, 2 months ago

When the solid like sugar and salt like that we put in water they dissolve so, this is called soluble

3Thank You

ANSWER

Name the three sub atomic particles of an atom

Posted by Satyadeep Sharma Sharma 5 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Abhishek Kumar 5 years, 2 months ago

N p e

Ankush Ranjan 5 years, 2 months ago

The three subatomic particles are 1.neutron 2.proton 3. Electron

Thakur Vishal Singh Rana 5 years, 2 months ago

Nice

Shanmukh Gunturi 5 years, 2 months ago

The three subatomic particles are 1.neutron 2.proton 3. Electron

3Thank You

Vidhi Agarwal 5 years, 2 months ago

Hi stayadeep.. The 3 subatomic particles of an atom are- Proton Neutron Electron

ANSWER

The atomicity of phosphorus molecules 4 3 2 1

Posted by Nisha Murali 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Sanjana Parmar 5 years, 2 months ago

Nisha Murali 5 years, 2 months ago

ANSWER

The number of moles in 48 He is A)10 B)11 C) 12 D) 6

Posted by Nisha Murali 5 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Abhishek Singh 5 years, 2 months ago

Sanjana Parmar 5 years, 2 months ago

Parul Ailawadi 5 years, 2 months ago

No. of moles=given mass/molar mass =48/4=12 mole The molar mass of He is 4 g which is usually twice the atomic number and the atomic no. of He is 2 so 2*2=4

Vedika Kengale 5 years, 2 months ago

Ankush Ranjan 5 years, 2 months ago

C) 12