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Meghna Thapar 5 years, 5 months ago
Homologous series describes organic chemical compounds that have similar structure that only differ by the number of carbon and hydrogen atom that are contained in the main carbon chain.
Methane belongs to the homologous series known as alkanes and it is the simplest of the organic chemical compounds that are in this series.
The alkanes have a general formula of CₐH₂ₐ₊₂ . Where 'a' represents the number of carbon atoms that are in each molecule of the alkane compound, and that are bonded by single bonds to each other and the hydrogen atoms.
You can use the formula CₐH₂ₐ₊₂ to find the second, third, fourth compound of this homologous series, and so on...
The second compound is: a = 2
Therefore CₐH₂ₐ₊₂ = C₂H₍₂ₓ₂₎₊₂
= C₂H₆(ethane)
The third compound will be: (where a = 3)
CₐH₂ₐ₊₂ = C₃H₍₂ₓ₃₎₊₂
= C₃H₈(propane)
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Posted by Tharun M 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Potential difference between live wire and neutral wire is 220V. An electric fuse is placed in the path of the phase wire before it is connected to the electric meter.
Posted by Desi Log Sharafat Ali 5 years, 7 months ago
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Posted by Aryan Aryan 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
Oxygen, for plants, is essential because it makes the process of respiration more efficient (known as aerobic respiration). Plant cells are respiring constantly. But, during times when they can't access light, most plants respire more than they photosynthesize, so they take in more oxygen than they produce. Respiration is the process of oxidation of food substances that release carbon dioxide; it takes place throughout the day. Photosynthesis takes place during day in presence of Sunlight only. Hence, plants release oxygen during day only while carbon dioxide is released during night.
Posted by Bindusar Maurya 5 years, 7 months ago
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Posted by Bindusar Maurya 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
- Inspiration and expiration are two processes involved in respiration. Inspiration is the process of taking in of the air and expiration is the breathing out of the air.
- During inspiration, there is an increase in the volume of the thoracic area. The diaphragm becomes flattened and there is the relaxation of the intercostal muscles. This allows the increase in the thoracic cavity and allows the lungs to expand and take the air inside.
- During expiration, there is a decrease in the volume of the thoracic cavity due to diaphragm being dome-shaped and contraction of the intercostal muscles. This allows the lungs to push the air outside.
Posted by Bindusar Maurya 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
At the top of the trachea (or wind pipe) there is a flap of cartilage called epiglottis. The function of epiglottis is to cover the mouth of trachea (or wind pipe) when we swallow food so that the food may not enter the trachea (or wind pipe).
Posted by ? Ishika ?? 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
Anaerobic respiration takes place in human muscles during vigorous physical exercise because oxygen gets used up faster in the muscle cells than can be supplied by the blood. The end-products of anaerobic respiration in muscles of human beings is lactic acid and in yeast cells, ethanol and carbon dioxide are released. Carbon dioxide and water are released during aerobic respiration. Large amount of energy is released in aerobic respiration as compared to anaerobic respiration.
Posted by ? Ishika ?? 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
The major events during photosynthesis are:
- absorption of light energy by chlorophyll
- conversion of light energy to chemical energy
- splitting of H2O into H2,O2 and energy
- reduction of CO2 to carbohydrates
Posted by ? Ishika ?? 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
The adaptations of leaf for photosynthesis are:
(i) Large surface area for maximum light absorption.
(ii) The presence of chlorophyll containing chloroplast.
(iii) The presence of numerous stomata on the surface for gaseous exchange.
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- Incident ray: A ray of light from a source that falls on the surface is called an incident ray of light.
- Reflected ray: The ray of light that bounces back from the surface of an object is called a reflected ray of light.
- Normal at point of incidence: A line drawn perpendicular on the surface (i.e. making 90° angle with the surface) of an object at the point of incidence is called a normal point of incidence.
Posted by Akash Ps 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
- Sun's heat which falls on the earth can be harnessed for various heating and lighting purposes.
- Most of the sun's heat is absorbed is the atmosphere.
- Only a very small portion reaches the earth and it is this energy that can be harnessed for energy purposes.
- A black surface absorbs more heat than a white surface.
- This property is used in Solar cookers, Solar water heaters and Solar cells.
Posted by Ashok Kumar 5 years, 7 months ago
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Bile helps to emulsify fats (increasing surface area to help enzyme action), and thus aids in their absorption in the small intestine. It also makes the acidic food coming from the stomach alkaline, so as to enable the action of pancreatic enzymes.
Posted by Mayank Baghel 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
When a metal reacts with steam then the products formed are metal oxide and hydrogen gas.
Metal + steam → Metal oxide + Hydrogen
When red hot iron reacts with steam to form iron(II,III) oxide and hydrogen.
3Fe(s) + 4H2O(g) steam → Fe3O4 (s) + 4H2(g)
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Himmaja Siva 5 years, 7 months ago
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