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Ask QuestionPosted by Smile Smile☺ 7 years, 1 month ago
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Siddhee Singh 7 years, 1 month ago
Yogita Ingle 7 years, 1 month ago
Atomic number: Atomic number (z) is the number of protons in an atom; it is also equal to the number of electrons in the atom.
Atomic number = Number of protons
Example: The atomic number of an element is 12 then its atom contains 12 protons and 12 electrons.
Mass Number: The mass number (A) is defined as the sum of the number of protons and neutrons present in the nucleus of an atom. Example: Mass number of Nitrogen atom is 14 then it contains 7 protons and 7 neutrons.
Mass number = Protons + Neutrons
Akanksha Maurya 7 years, 1 month ago
Posted by Gangadhar Naik 7 years, 1 month ago
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Posted by Gangadhar Naik 7 years, 1 month ago
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Akanksha Maurya 7 years, 1 month ago
Posted by Gangadhar Naik 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
The law of conservation of energy states that energy can neither be created nor be destroyed. It may be transferred from one of its forms to the other. If you take all forms of <a href="https://byjus.com/physics/energy/">energy</a> into account, the total energy of an isolated system always remains constant.
Example
In a loudspeaker, electrical energy is converted into sound energy.
In a microphone, sound energy is converted into electrical energy.
Posted by Gangadhar Naik 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
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Physical Change |
Chemical Change |
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In a physical change, the molecules are rearranged while their actual composition remains same. |
In a chemical change, the molecular composition of a substance completely changes and a new substance is formed. |
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Some example of physical change are freezing of water, melting of wax, boiling of water, etc. |
A few examples of chemical change are digestion of food, burning of coal, rusting, etc. |
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Physical change is easily reversible i.e original substance can be recovered. |
Chemical change is irreversible i.e. original substance cannot be recovered. |
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In physical change, no new substance is formed. |
A chemical change is always accompanied by one or more new substance(s). |
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Physical change is a temporary change. |
Chemical change is a permanent change. |
Akanksha Maurya 7 years, 1 month ago
Posted by Gangadhar Naik 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
The scattering of a beam of light by the particles of a colloid is called the Tyndall effect. When we apply torch light on a galss of milk then the path of the light becomes visible but it is not so in case of water because in milk light is scattered by its very fine particles.
Tyndall effect can be observed when sunlight passes through the canopy of a dense forest. In the forest, mist contains tiny droplets of water, which act as particles of colloid dispersed in air.
Akanksha Kumari? 7 years, 1 month ago
Posted by Gangadhar Naik 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
Saturated solution. A solution in which no more of the solid (solute) can be dissolved at a given temperature and pressure is called a saturated solution.
Unsaturated solution. A solution in which more of the solid can be dissolved at the given temperature and pressure is called an unsaturated solution.
Akanksha Maurya 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
Gel: Gel is formed by the mixing of solid as dispersing medium and liquid as dispersed phase. For example – gelatin, jelly, hair gel, etc.
Posted by Siddhee Singh 7 years, 1 month ago
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Akanksha Maurya 7 years, 1 month ago
Yogita Ingle 7 years, 1 month ago
It's not that you sweat more, but it's because in high humidity the air is already full of water, so therefore the sweat does not evaporate off your skin as quickly. The absence of the "cooling" effect of evaporating sweat makes our bodies feel hotter in humid climates, thus we continue to sweat.
Posted by Siddhee Singh 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
Cell wall: In higher plants cell wall is made up of cellulose, hemicellulose, pectin, lignin and suberin. Calcium and magnesium salts are also present.
Cell wall of fungus is made up of chitin.
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Yogita Ingle 7 years, 1 month ago
AIDS or Acquired Immune Deficiency Syndrome is a syndrome caused by the HIV virus. In this condition, a person’s immune system becomes too weak to fight off any kind of infection or disease. AIDS is usually the last stage of HIV infection; a stage where the body can no longer defend itself and thus spawns various diseases. AIDS, when untreated, leads to death.
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