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Ask QuestionPosted by Roshani Pal 4 years ago
- 2 answers
Yogita Ingle 4 years ago
Atomic mass refers to the mass of an atom. It depicts how many times an atom of an element is heavier than one-twelth (1/12th) the mass of one atom of carbon-12 of mass of one carbon atom. The relative atomic masses of all elements have been established with reverence to an atom of carbon-12. It is measured in unit called amu (atomic mass unit). 1/12 of the mass of one atom of carbon is termed as relative atomic mass. It doesnot possess a unit.
Mathematically,
mass of one atom of an element = atomic mass X (1/12th) of the mass of one atom of carbon.
Or
atomic mass = mass of one atom of an element / (1/12th) of the mass of one atom of carbon.
Posted by Darshan Gowda . R Darshan Gowda . R 4 years ago
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Posted by Rengavadivelammal .C 4 years ago
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Rohit Gupta 4 years ago
Posted by Disha Thakur 4 years ago
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Dr.Riya Bhanushali 4 years ago
Yogita Ingle 4 years ago
Metalloids are the elements which are having a combination of some properties of metals along with some properties of nonmetals. Their properties are intermediate between the properties of metals and nonmetals, they are also called semi-metals.
Example: – Boron, Silicon, Germanium, etc
Posted by Muthu Dainy 4 years ago
- 2 answers
Yogita Ingle 4 years ago
60% by volume of alcohol solution means,each 100 ml of solution will have 60 ml ethyl alcohol.
so,250 ml of solution will have
=(60/100)x250=150 ml of ethyl alcohol
hence in a 250ml solution of 60% by volume of alchohol and water,alcohol should be 150 ml and water should be 100 ml.
Ananya K 4 years ago
Posted by Ragini Soni 4 years ago
- 3 answers
Meghna Thapar 4 years ago
An atom is the smallest particle of the element that can exist independently and retain all its chemical properties. A molecule is the smallest particle of an element or a compound capable of independent existence under ordinary conditions. It shows all the properties of the substance. Electrons are the smallest of the three particles that make up atoms. Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.
Yogita Ingle 4 years ago
The smallest particle of matter, which can take part in a chemical reaction is called atom.
Question 5. Define molecule.
Answer: The smallest particle of an element or compound which can exist independently is called molecule.
Muthu Dainy 4 years ago
Posted by Aditya Kumar 4 years ago
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Abhishek Chaudhary 4 years ago
Deepanshi Antil 4 years ago
Posted by Muskan Singh 4 years ago
- 2 answers
Yogita Ingle 4 years ago
When fireman directs a large amount of water at a high velocity on fire from a hose pipe, they have to hold the hose pipe strongly because of its tendency to go backwards. The backward movement of the hose pipe is due to the backward reaction force of water rushing out through it in the forward direction at a high speed as per the Newton's third law of motion.
Ananya K 4 years ago
Posted by Ananya K 4 years ago
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Yogita Ingle 4 years ago
Sieve tubes, companion cells, phloem fibres and phloem parenchyma are the different elements of phloem.
Posted by Ananya K 4 years ago
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Rohit Gupta 4 years ago
Yogita Ingle 4 years ago
Parenchyma cells have thin cellulosic cell walls. Collenchyma cells have thicker cellulosic walls and also may have pectin deposition on corners. Sclerenchyma cells have thick lignified cell walls and are dead at maturity and provide protection to the different parts of the body. Epithelial cells are thin-walled and living.
Posted by Charming Princess? 4 years ago
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Ananya K 4 years ago
Posted by Kanika Kanika 4 years ago
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Ananya K 4 years ago
Posted by Charming Princess? 4 years ago
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Meghna Thapar 4 years ago
- Infectious and non-infectious causes:
One of the causes of diseases is the infectious agents, mostly called microbes or micro-organisms. Diseases where microbes are the immediate causes are called infectious diseases. This is because they spread the diseases in the community.
Some diseases are not caused by infectious agents. Their causes vary, but they are not external causes like microbes that can spread in the community. Instead, these are mostly internal, non-infectious causes. Such diseases are called non-infectious diseases. For example, cancer is caused by genetic abnormalities. High blood pressure can be caused by excessive weight and lack of exercise. Different diseases spread by different means and can be treated and prevented at community level.
- Infectious diseases:
- Infectious agents:
Organisms that can cause disease are found in a wide range of such categories. Some of them are viruses, bacteria, fungi, protozoans or multicellular organisms, such as worms.
|
Category of Infectious Agent |
Examples of Diseases Caused |
|
Virus |
Common cold, influenza, Dengue fever, AIDS |
|
Bacteria |
Typhoid, cholera, tuberculosis, anthrax |
|
Fungi |
Skin infections |
|
Protozoans |
Malaria, kala-azar |
|
Worms |
Intestinal worm infections, elephantiasis |
Posted by Charming Princess? 4 years ago
- 1 answers
Meghna Thapar 4 years ago
An infectious disease can be spread and is caused by a pathogen. A noninfectious disease cannot be spread and is caused different factors.
Infectious causes: They include the agents like microbes or micro-organisms as the immediate causes which spread the disease from an infected person to a healthy person.
Non-infectious causes: The disease which does not spread by contact between infected and healthy person through air and water, is called non-infectious disease.
Infectious Diseases: The diseases which spread due to infection by micro-organisms are called infectious diseases.
When a disease causing organism enters our body it causes infection, it multiplies and grows in the body called host and micro-organisms multiplies in the host body.
For example: Tuberculosis, tetanus, Common cold, AIDS, etc.
Non-infectious Diseases: The disease which does not spread by contact between infected and healthy person through air and water, is called non-infectious disease.
For example: Cancer, genetic abnormalities, high blood pressure, etc.
Posted by Charming Princess? 4 years ago
- 1 answers
Meghna Thapar 4 years ago
- Acute and chronic diseases:
Some diseases last for only very short periods of time and their symptoms are quickly visible, they are called acute diseases. Example – common cold, cough, typhoid, etc. They do not cause long term bad effects on the body.
The ailments which can last for a long time, even as much as a lifetime, and their symptoms lasts for months or years, are called chronic diseases. Example – tuberculosis, cancer, diabetes, etc. They cause drastic long term effects on human body.
Posted by Luis Fonsi 4 years ago
- 2 answers
Ananya K 4 years ago
Meghna Thapar 4 years ago
Signs and symptoms are abnormalities that can indicate a potential medical condition. Whereas a symptom is subjective, that is, apparent only to the patient (for example back pain or fatigue), a sign is any objective evidence of a disease that can be observed by others (for example a skin rash or lump). A fever is a temporary increase in your body temperature, often due to an illness. Having a fever is a sign that something out of the ordinary is going on in your body. For an adult, a fever may be uncomfortable, but usually isn't a cause for concern unless it reaches 103 F (39.4 C) or higher.
Posted by Rishita Soni 4 years ago
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Muthu Dainy 4 years ago
Posted by Seema Sing 4 years ago
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Fatima Zehra Khan 4 years ago
Posted by Harveen Kaur 4 years ago
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Lavishka Choudhary 4 years ago
Posted by Mahes Kumar 4 years ago
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Posted by Ayush Kumar 4 years ago
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Yogita Ingle 4 years ago
The types of simple tissues are parenchyma, collenchyma, sclerenchyma and aerenchyma.
Ayush Kumar 4 years ago
Posted by Pratibha Pratibha 4 years ago
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Ananya K 4 years ago
Posted by Madhwi ? 4 years ago
- 4 answers
Ananya K 4 years ago
Yogita Ingle 4 years ago
- In case of uniform composition, the molecules of all the components are arranged uniformly throughout the mixture.
- It is not possible to recognize them individually as the mixture gets a uniform texture.
Posted by Divyahb Divya 4 years ago
- 0 answers
Posted by Gourav Bajaj 4 years ago
- 5 answers
Bhumika Sharma ✓ 4 years ago
Madhu 433576 4 years ago
Yogita Ingle 4 years ago
Cells are the structural, functional, and biological units of all living beings. A cell can replicate itself independently. Hence, they are known as the building blocks of life.
Posted by Divya Singh 4 years ago
- 3 answers
Yogita Ingle 4 years ago
1 mole of nitrogen atoms is equivalent to the gram atomic mass of nitrogen. Therefore, 1 mole of nitrogen atoms contains 14 g.
Ananya K 4 years ago
Posted by Tiger$ Praful Jawale 4 years ago
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Posted by Muskan Singh 4 years ago
- 2 answers
Yogita Ingle 4 years ago
The drawback of Rutherford model is:
It can't explain the stability of an atom. As per the model, the orbital revolution of electrons around the nucleus is not stable as the revolving electrons in orbits will undergo acceleration and emit energy. This will result in loss of energy of electrons and they will ultimately fall into the nucleus.
Tiger$ Praful Jawale 4 years ago
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Rishabh Kudrigi 4 years ago
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