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

The molecular mass of the sulphur molecule is 32 × 8 = 256 u. 1 mole of sulphur molecules is equal to 256 grams. This means 256 g of solid sulphur contains = 6.022 x 1023 molecules. Therefore, 16 g of S8 contains 3.76 x 1022 molecules.

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How many moles are in 12 g of helium?

Posted by Shanu Prakash 3 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Piyush Prajapati 3 years, 6 months ago

3 mole are present in 12g of helium

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Vanshika Jangra 3 years, 6 months ago

No of moles = given mass / molar mass No of moles =12/4 No. Of moles = 3

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Mayank Mannat 3 years, 6 months ago

The value of the mole is equal to the number of atoms in exactly 12 grams of pure carbon-12. 12.00 g C-12 = 1 mol C-12 atoms = 6.022 × 1023 atoms • The number of particles in 1 mole is called Avogadro's Number (6.0221421 x 1023).

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What precaution could you take in your school to reduce the incidence of infectious disease ?

Posted by Deepak Kumar 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Abhinav Narayan 3 years, 6 months ago

The precautions I will take to reduce the incidence of infectious disease are 1. Maintain distance from each student 2. Use sanitizer and mask 3. Take a bath and wash my clothes when I'll return from school

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CGS unit of work

Posted by Aditya Raj 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Smile 😇 3 years, 6 months ago

The CGS unit of work is erg

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A lift carries a 5 person with an average mass of 60kg to a height of 27m in 9sec at a constant speed what is the power of the lift.

Posted by Abirami C 3 years, 6 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

"SOMEDAY" IS A DISEASE WHICH KILLS DREAMS READ AGAIN I HATE GIRLS WHO SAY "ALL BOYS R SAME" WHO TOLD U TRY THEM ALL IF U R A TOPPER NICE TO MEET U I AM A TEACHER HATE ME I NEVER MIND TO LIVE A HAPPY LIFE TIE IT TO A GOAL I NEVER TURN BACK UNTIL I SEE A GOOD VIEW

Posted by Âťťíťůđē Bøý 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Âťťíťůđē Bøý 3 years, 6 months ago

My first request and my last warning don't make me angry

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Âťťíťůđē Bøý 3 years, 6 months ago

Tu chapri

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Átîtúde Girl . . 3 years, 6 months ago

Waa kya likta hai ...

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Ayush Mani 3 years, 6 months ago

Bahi isliye log teko chapri bolte h? Example apna username he delh le

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Âťťíťůđē Bøý 3 years, 6 months ago

Imagine with all ur mind Belive with all ur heart Achieve with all ur might

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Water is called the wonder liquid . Explain

Posted by Pal D. Pathak 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Anam Anam Khan 3 years, 6 months ago

Water is wonder liquid because this is made by nature

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How's my quotes

Posted by Âťťíťůđē Bøý 3 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Utkarsh Thakur 3 years, 5 months ago

I think you are showing off???

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K_Hushii 🍁 3 years, 5 months ago

Bhaut aache h aap roz aise h post kiya kro plz.....mujhe bhaut pasand h apke quotes......?

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Mayank Mannat 3 years, 5 months ago

Oh really?? ????

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Âťťíťůđē Bøý 3 years, 6 months ago

I'M 99%GOOD PERSON BUT MY 1%IS ENOUGH TO KILL U

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Write a note on soil formation

Posted by Pal D. Pathak 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Kajal Verma 3 years, 6 months ago

Weathering is the cause of soil formation

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乂ＢꮮㅤȺʏｕꜱ卄ㅤ✓ . 3 years, 6 months ago

Bl ayush

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Why do helium, neon and argon has a zero velocity

Posted by Sona Satya 3 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Piyush Prajapati 3 years, 6 months ago

Velocity nahi valency because helium ,neon ,argon are noble gasses and also monoatomic so there valnces are 0

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Piyush Prajapati 3 years, 6 months ago

Velocity nahi valency Because Helium, argon,neon are monoatomic so there balendu are zero

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Kajal Verma 3 years, 6 months ago

That's why they have 0 valency

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Kajal Verma 3 years, 6 months ago

Velocity nhi valency they have 0valency because of there outermost shell is totaly filled with electron Combining capacity is known as valency And their outermost shell is filled so they are stable and not combine with other atom

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What are isotopes ? Give any 3 example

Posted by Gunjan Taank 3 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Pal D. Pathak 3 years, 6 months ago

Isotopes are the elements which same no. of protons but different no. of neutrons

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Angel Madhwani Madhwani 3 years, 6 months ago

Isotope → Isotopes are atoms with the same number of protons, but differ in numbers of neutrons. Isotopes are different forms of a single element. Example - Carbon 12 and Carbon 14 are both isotopes of carbon, one with 6 neutrons and one with 8 neutrons.

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Kartik Yadav 3 years, 6 months ago

Isotopes are elements in which atomic number is same but atomic mass different Example - isotopes of hydrogen with atomic number 1 but mass 1 2 3

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Write the correct representation of an element ‘X’ which contains 15 electrons and sixteen neutrons. b) In the atom of an element X, 6 electrons are present in the outermost shell. If it acquires noble gas configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed? 4. An element ‘Z’ forms the following compound when it reacts with hydrogen, chlorine, oxygen and phosphorous. ZH3, ZCl3, Z2O3 and ZP (a) What is the valency of element ‘Z’? (b) Element ‘Z’ is metal or non-metal?

Posted by Vijaya Bhalerao 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Kajal Verma 3 years, 6 months ago

-2

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Kajal Verma 3 years, 6 months ago

X has lower subscript15and upper is31 2, +2,z has valency 3 It is metal

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Hi guy's My snap id unique_bunny22

Posted by Mayank Kumar 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Pal D. Pathak 3 years, 6 months ago

Ok I will surely add you to my snap friends list ?

1Thank You

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What do meant ny diffusion?

Posted by (༎ຶ Isha ༎ຶ) 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Mishra Queen 3 years, 6 months ago

Diffusion is defined as the movement of individual molecules of a substance

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Kajal Verma 3 years, 6 months ago

Mixing of two substances on their own

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Define Matter.

Posted by (༎ຶ Isha ༎ຶ) 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Reetika Mewade 3 years, 5 months ago

Anything that has mass, occupies space, and can be perceived by our senses

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Abhinav Narayan 3 years, 6 months ago

Anything in the Universe that has mass and occupies some space is matter

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Angel Madhwani Madhwani 3 years, 6 months ago

Matter is any substance that has mass and takes up space by having volume.All everyday objects that can be touched are ultimately composed of atoms, which are made up of interacting subatomic particles, and in everyday as well as scientific usage, "matter" generally includes atoms and anything made up of them, and any particles (or combination of particles) that act as if they have both rest mass and volume.

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Mishra Queen 3 years, 6 months ago

Matter has a occupies space and mass...

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Sheetal Sharma 3 years, 6 months ago

Matter has a occupies space and has mass

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What are the characteristics of Matter?

Posted by (༎ຶ Isha ༎ຶ) 3 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Kajal Verma 3 years, 6 months ago

Matter are made up of very small particles The particles of matter ae continuously moving The particles of matter have space between them

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Sheetal Sharma 3 years, 6 months ago

2:particles of matter are continuously moving 3: particles of matter attract each other 4:

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Sheetal Sharma 3 years, 6 months ago

1: particles of matter have space between them

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What do you meant by biology?

Posted by (༎ຶ Isha ༎ຶ) 3 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Ayush Kumar 3 years, 6 months ago

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Shakila Begam 3 years, 6 months ago

Biology is a subject

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Kajal Verma 3 years, 6 months ago

Study of livingbeings

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Why do we fall ill? Give reason

Posted by (༎ຶ Isha ༎ຶ) 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Kajal Verma 3 years, 6 months ago

Due to disturbance in the normal body function it may be from defeciency or disease causing pathogen.

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02 Himani Arora 3 years, 6 months ago

This is because the immune system of our body is normally fighting off microbes. Our body have cells that are specialised in killing infecting microbes.

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Shahnoor Khan 3 years, 6 months ago

The Normal body function is disturbed and immune system is week.

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Brand Jaat Sarkar 3 years, 6 months ago

Who discoveries vaccine

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Harshita Singh 3 years, 6 months ago

The normal working of our body system get disturbed,we feel sick.it happen when a bacterium, virus ...etc enter in our body

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Explain the *** determination of a baby? It's a 8th class question.

Posted by (༎ຶ Isha ༎ຶ) 3 years, 6 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What's is cell

Posted by Sahil Faridi 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Khushboo Mulchandani 3 years, 6 months ago

Cell is the basic unit of living organisms.Every living components in the world made of this minor cell.

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Abhishek Kumar 3 years, 6 months ago

The smallest unit that can live on its own and that makes up all living organisms and the tissues of the body. A cell has three main parts: the cell membrane, the nucleus, and the cytoplasm.

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State the limitations of thomsons model of the atom

Posted by Palak Makwana 3 years, 6 months ago

CBSE > Class 09 > Science