Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Anandhu S 5 years, 10 months ago
- 4 answers
Shourya Jain 5 years, 10 months ago
Parth Sharma 5 years, 10 months ago
Posted by Khushbu Pal 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 7 months ago
Valency can be used to find out how the atoms of an element will combine with the atom(s) of another element to form a chemical compound.
Using the valency of ions, we can write the formulae of compounds.
The property by which the same element may exhibit one valency in one compound and another valency in some other compound is called variable valency.
Posted by Khurshid Raahi 5 years, 10 months ago
- 1 answers
Posted by Merlin D.T 5 years, 10 months ago
- 2 answers
Shourya Jain 5 years, 10 months ago
Hariom Dalal 5 years, 10 months ago
Posted by Disha Saratkar 5 years, 10 months ago
- 1 answers
Yogita Ingle 5 years, 10 months ago
Mass of atom is called atomic mass. Since, atoms are very small consequently actual mass of an atom is very small. For example the actual mass of one atom of hydrogen is equal to 1.673 x 10-24 g. This is equal to 0.000000000000000000000001673 gram. To deal with such small nuber is very difficult. Thus for convenience relative atomic mass is used.
Carbon-12 is considered as unit to calculate atomic mass. Carbon-12 is an isotope of carbon. The relative mass of all atoms are found with respect to C-12.
One atomic mass = 1/12 of the mass of one atom of C-12.
This means atomic mass unit = 1/12th of carbon-12
Posted by Ayush Tiwari 5 years, 10 months ago
- 2 answers
Posted by Harsh Kumar Giri 5 years, 10 months ago
- 1 answers
Yogita Ingle 5 years, 10 months ago
Atoms are divisible contrary to the early beliefs that the smallest "indivisible" matter is an atom. When an atom loses its identity it means that they are divisible. Atoms chemically react with other kinds of atoms thus changing their activity. During a chemical reaction, there is an exchange of electrons. When electrons are transferred, that is the very first evidence that an atom is divided: electron is detached to the entire atom. Secondly, nuclear reaction is another proof that atoms are divisible. During nuclear reactions, atoms are either combined (fusion) or separated (fission) to form another kind of element.
Posted by Prachi Chouhan 5 years, 10 months ago
- 4 answers
Posted by Durga Durga 5 years, 10 months ago
- 3 answers
Posted by Diya Mundra 5 years, 10 months ago
- 2 answers
Yogita Ingle 5 years, 10 months ago
The outermost electron shell of an atom is called valence shell. The electrons present in outermost shell of an atom are called as valence electrons.
Posted by Karamjeet Singh Jassal 5 years, 10 months ago
- 1 answers
Yogita Ingle 5 years, 10 months ago
The organisms belonging to phylum Mollusca exhibit the following characteristics:
-
They are mostly found in marine and fresh water. Very few are terrestrial found in damp soil.
-
The body is divided into segments.
-
They exhibit organ system level of organization.
-
Their body has a cavity.
-
The body is divided into head, dorsal visceral mass, and ventral muscular foot and mantle.
-
The head comprises of tentacles and compound eyes.
-
The body is covered by a shell made up of calcium carbonate.
-
The ventral muscular foot helps in locomotion.
Posted by Kashish Pandey 5 years, 10 months ago
- 1 answers
Posted by Dev Kumar 5 years, 10 months ago
- 3 answers
Khurshid Raahi 5 years, 10 months ago
Barenyam Malla 5 years, 10 months ago
Posted by Padumi Chaudhury 5 years, 10 months ago
- 7 answers
Padumi Chaudhury 5 years, 10 months ago
Ashutosh Kumar Tiwari 5 years, 10 months ago
Aayan Shahid 5 years, 10 months ago
Posted by Kumar Kumar N 5 years, 10 months ago
- 1 answers
Yogita Ingle 5 years, 9 months ago
In aves, air sacs and pneumatic bones (Bones which are hollow and filled with air) are present. Pneumatic bones make their body light weight and facilitate the flying and air sacs are helpful in respiration and buoyancy.
Posted by Jard J 5 years, 10 months ago
- 2 answers
Padumi Chaudhury 5 years, 10 months ago
Posted by Indra Lokesh 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 7 months ago
| Amphibia | Reptilia | Aves | Mammals | |
| Habitat | Both land and water | Some terrestrial, others aquatic | Terrestrial (aerial) | Usually terrestrial, few aquatic. |
| Control of body temperature | Cold-blooded | Cold-blooded | Warm-blooded | Warm-blooded |
| Respiration | Gills, lungs or skin | Lungs | Lungs | Lungs |
| Locomotion | Limbs | Limbs | Wings | Limbs |
| Examples | Frog, salamander, toad | Crocodile, snake, turtle, lizard | Pigeon, ostrich, hen, duck | Human, whale, bat, lion |
Posted by Pooja Patil 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 7 months ago
- Principles of Treatment:
There are two ways to treat an infectious disease. One is to reduce the effects of the disease and the other way is to kill the cause of the disease. For the first requirement, we can provide treatments that will reduce the symptoms. The symptoms are usually a result of inflammation. For example, we can take medicines that bring down fever, reduce pain or loose motions. We can take bed rest so that we can converse our energy.
However such a kind of symptom-directed treatment by itself is inadequate. Since it will not make the pathogen go away, so the disease will not be cured. For that we have to kill the microbe itself.
It is harder to make anti-viral medicine than making anti-bacterial medicines because viruses have few biochemical mechanisms of their own. They enter our cells and use our machinery for their life processes.
- Principles of Prevention:
The approach of treatment of an infectious disease has three drawbacks:
- Recovery of the patient may not be complete in certain cases.
- Treatment requires time; hence the patient suffers from the disease and may be bedridden.
- The patient serves as the source of spread of infection to others.
Posted by Nikita Roster 5 years, 10 months ago
- 2 answers
Posted by Sagar Sharma 5 years, 10 months ago
- 1 answers
Posted by Balaraju Goud 5 years, 10 months ago
- 3 answers
Ashutosh Kumar Tiwari 5 years, 10 months ago
Posted by Surendra Sharma 5 years, 10 months ago
- 9 answers
Posted by Pooja Patil 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 7 months ago
Centrifugation:
This method is based on the principle of settling down under mechanical rotation, where insoluble heavier solid particles are present in an insoluble solid-liquid mixture.
Evaporation:
This method is based on the evaporation of the liquid component in a soluble solid-liquid mixture.
Sublimation: This method is based on the sublimable and non-sublimable nature of solids.
Posted by Shakeela Shakeela 5 years, 10 months ago
- 2 answers
Posted by Aryan Kumar 5 years, 10 months ago
- 2 answers
Posted by Prachi Chouhan 5 years, 10 months ago
- 5 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
45516111? 46 5 years, 10 months ago
0Thank You