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

LAW OF CONSEVATION OF MASS = the mass can neither be created nor be destroyed in chemical reaction . LAW OF CONSTANT PROPORTION =in the chemical substance the elements are present in definite proportion by mass

0Thank You

Nitin Jangra,?✌ 7 years, 2 months ago

It states that Compounds are only formed when two or more elements are mixed in a fixed ratio by mass

1Thank You

Nitin Jangra,?✌ 7 years, 2 months ago

It states that Mass of reactants is equal to mass of reaction

1Thank You

ANSWER

An atom of an element x may be represented as 39/19x

Posted by Balu Bharadwaj 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

A ball is thrown vertically upwards and to the thrower in 12 sec.(g=9.6m/s square)Find :1 the velocity at which the ball is thrown up

Posted by Vikas Masih 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Nitin Jangra,?✌ 7 years, 2 months ago

We know that when we throw vertically upward then v=0 U=? T=12s G=9.6 V=U+AT 0=u+9.6* 12 0=u+115.2 U=-115.2

1Thank You

ANSWER

Whats about coelenterata (cnidaria).

Posted by Aditya Raghav 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Draw back of rutherford

Posted by Isha Tanwar 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Nitin Jangra,?✌ 7 years, 2 months ago

He does not tell us about stability of atom

3Thank You

ANSWER

Draw back of Rutherford's model

Posted by Vaish Shukla 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Khushi Boora 7 years, 2 months ago

He doesn't explain the stability of atom. 2. He couldn't explain the distribution of electrons.

2Thank You

Nitin Jangra,?✌ 7 years, 2 months ago

It doesn't tell us about stability of atom

1Thank You

ANSWER

Conclusion of Rutherford model pf sn stom

Posted by Manav Negi 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Nitin Jangra,?✌ 7 years, 2 months ago

1=atom has large empty space 2=their is a body in the center of atom which is havier than alpha particles 3=he gave it name " nucleus" 4=this body contain positive ly charged particles or Protons

0Thank You

ANSWER

Photosynthesis

Posted by Pinku Kumar Mohanta 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Akanksha Kumari? 7 years, 2 months ago

The process by which green plants prepare their own food in the presence of sunlight is called photosynthesis.

1Thank You

ANSWER

What is atom

Posted by Shristi Thakur 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Palak ?? 7 years, 2 months ago

An atomis the smallest part from which all matter is made up of....it may or may not be able of its independent exsistence

0Thank You

Akanksha Kumari? 7 years, 2 months ago

An atom is the smallest particle of an element that can take part in a chemical reaction.

0Thank You

ANSWER

How should I revise all the lessons for final exam not only in science but also in other subjects?? Can you please tell me yours planning

Posted by Akanksha Kumari? 7 years, 2 months ago

CBSE > Class 09 > Science

6 answers

Sangita???? Ankita 7 years, 2 months ago

according 2 me u have to make note about your study plan whatever u do in your next day before slepping nd follow this . l hope this helps u nd best of luck 4 ur xam

2Thank You

Palak ?? 7 years, 2 months ago

Dedicate some time to ur study and make short notes of the lesson.....day before exams just go through the notes once and sometime before ur exams start,go through the notes again.......because no matter what u study the whole year....no one can beat the last minute revision.....??

2Thank You

Shreeya Gupta 7 years, 2 months ago

Keep calm and make a busy plan of study from 15-20 days before exam leaving all the hustle-bustle and humdrum

2Thank You

Aman Anshuman 7 years, 2 months ago

Be dedicated for learning .Then you will see everything is going easily .

1Thank You

Soumya Ranjan Patra 7 years, 2 months ago

Just make schedule for learning,.........THANK YOU

1Thank You

Hiren Rajput 7 years, 2 months ago

Solve all your previous question papers first

1Thank You

ANSWER

What is avagardo number

Posted by Shubham Singh 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Palak ?? 7 years, 2 months ago

Avegadro no. Is that quantity in no. Which depicts the no. Of any particle in one mole....its value isgiven?

1Thank You

Hiren Rajput 7 years, 2 months ago

The number of particles present in 1mole of any substance is fixed, with a value of 6.022x10²³. This number is called as Avagrado number

0Thank You

Soham Kokate 7 years, 2 months ago

6.022 *10^22

0Thank You

ANSWER

Give one example of negative work done!!

Posted by Dhruvin Parmar 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Palak ?? 7 years, 2 months ago

Work done =force.displacement.....we know displacement can be negative......so when displacement is negative..work done is also negative...example:reversing of car.....

2Thank You

Hiren Rajput 7 years, 2 months ago

If A force of -5N is acting on an object. The object is displaced through 2m. Then work done is. -5N x 2m =10J

0Thank You

ANSWER

Whay is dna and functions

Posted by Tanvir Singh 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Palak ?? 7 years, 2 months ago

It's main function is to carry genes from one generation to another

1Thank You

Aditi Sharma 7 years, 2 months ago

It's main function is heridity that is the characters from their parents to their offspring in the form of gene.

0Thank You

G B 7 years, 2 months ago

Deoxyribonucliec acid

1Thank You

ANSWER

What us cathode rats

Posted by Gulshan Shukla 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Aman Anshuman 7 years, 2 months ago

Cathode rays are streams of electrons observed in vacuum tubes. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, glass behind the positive electrode is observed to glow, due to electrons emitted from the cathode.

0Thank You

ANSWER

Two chambered heart occurs in

Posted by Rakesh Solanki Rakesh 7 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Aditya Raghav 7 years, 2 months ago

Pisces in which all the aquatic animals were included.

1Thank You

Soumya Ranjan Patra 7 years, 2 months ago

Fish

0Thank You

G B 7 years, 2 months ago

Pices

0Thank You

Rakesh Solanki Rakesh 7 years, 2 months ago

Fish

1Thank You

ANSWER

What is environment

Posted by Ayush Raj 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Palak ?? 7 years, 2 months ago

Environment is a surrounding which consist of lithosphere, hydrosphere, atmosphere.....

1Thank You

Hiren Rajput 7 years, 2 months ago

The surroundings or conditions in which a human,plant or animal living is called environment

1Thank You

ANSWER

In which directon does the buoyant force on an object due to liquid act

Posted by Abhishek Kumar Tiwari 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Dhruvin Parmar 7 years, 2 months ago

Upward direction

1Thank You

ANSWER

Can anybody explain about pylums

Posted by Dishan Todalabagi 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Palak ?? 7 years, 2 months ago

Did u mean phylum??????

1Thank You

ANSWER

What is S.I unit of buoyant force

Posted by Abhishek Kumar Tiwari 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Akanksha Kumari? 7 years, 2 months ago

Newton. S.I unit of all the forces is newton

1Thank You

ANSWER

In which phylum do humans are?

Posted by Yashika Singh 7 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Mehakjot Kaur?? 7 years, 2 months ago

Animilia type mamilia

0Thank You

Aditi Sharma 7 years, 2 months ago

Chordata and subgroup mammila.

0Thank You

Soumya Ranjan Patra 7 years, 2 months ago

Animalia

0Thank You

Amit Kumar 7 years, 2 months ago

PHYLUM-Chordata GENUS-HOMO; suggested by LINNAEUS 1758 ORDER-PRIMATES KINGDOM-Animalia

2Thank You

Akanksha Kumari? 7 years, 2 months ago

Phylum Chordata

1Thank You

ANSWER

Why lisosoms are known has suisadel bags

Posted by Arjun Ramesh 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Neha Sharma 7 years, 2 months ago

Sometimes, lysosomes digests its own membrane bound organelles by its digestive enzymes inthe cell. Then, the cell will break down and become dead. That's why, lysosomes are also called suicidal bags.

1Thank You

ANSWER

Define the term work

Posted by Priyanshu Sagar 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Palak ?? 7 years, 2 months ago

Work can be defined as the dot product of force and displacement.... Work is said to be done when: 1) some force is applied due to which some displacement is produced 2) the angle between the applied force and displacement produced should not be equal to 0 or 90 degree....... If any of two condition are not satisfied then the work done is said to be zero

1Thank You

Soumya Ranjan Patra 7 years, 2 months ago

Work is said to be done when,force act on an object and the object was displaced

1Thank You

Akanksha Kumari? 7 years, 2 months ago

Work is the product of force acting on an object and the displacement in the direction of the applied force. It is a scalar quantity.

1Thank You

ANSWER

Write the two indian breeds which are always healthy?

Posted by Suresh Singh 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What remains unchanged during interconversion of state of a substance

Posted by Anmol Gupta 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Aman Anshuman 7 years, 2 months ago

Energy.

0Thank You

Akanksha Kumari? 7 years, 2 months ago

As the latent heat which changes the state of substance doesn't change the temperature.

1Thank You

Akanksha Kumari? 7 years, 2 months ago

Temperature

2Thank You

ANSWER

The practice of matter are very small prove that

Posted by Rishabh Yadav 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Palak ?? 7 years, 2 months ago

The particles of matter are very small they are so small that they can't be even seen with the powerful microscope their size is less than 10 nanometres

0Thank You

ANSWER

What is antibiotics?

Posted by Aastha Singhal 7 years, 2 months ago

CBSE > Class 09 > Science