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Yogita Ingle 5 years, 8 months ago
Decomposition reaction is the type of reaction in which the reactant give simpler products.
In Decomposition reaction a compound breaks down to give two or more simpler substances. In this reaction there is only one reactant. Decomposition reaction is the opposite of a combination reaction.
E.g : 1.Mercury (II) oxide on heating decomposes to give Mercury and oxygen.
2HgO (s) → 2Hg(l) + O2(g)
2.Copper (II) oxide on heating decomposes to give copper and oxygen.
2CuO (s) → Cu(s) + O2(g)
Decomposition reactions are of following types : •Thermal decomposition reactions•Electrolytic decomposition reactions•Photochemical decomposition reactions
Posted by Prince ? {The Love Guru}? 5 years, 8 months ago
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Vipin Jain 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
The mode of nutrition in which an organism is able to prepare its own food is called autotrophic mode of nutrition. Green plants follow autotrophic mode of nutrition.
Autotrophic nutrition is mainly of two types: photoautotrophic and chemoautotrophic nutrition.
Autotrophs which synthesise organic matter from inorganic substances using the energy from sunlight through photosynthesis are termed as photoautotrophs. E.g. plants, algae, cyanobacteria, phytoplanktons.
Autotrophs which synthesise organic matter from inorganic substances using chemical energy are termed as chemoautotrophs. E.g. nitrifying bacteria like Nitrosomonas, thermophilic bacteria like Thiobacillus.
Lucifer? Morningstar ? 5 years, 8 months ago
Posted by Guna Sekhar 5 years, 8 months ago
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Yogita Ingle 5 years, 7 months ago
Gallium is a chemical element with the symbol Ga and atomic number 31.
Melting point of Gallium is 302.9146 K (29.7646 °C, 85.5763 °F)
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Yogita Ingle 5 years, 8 months ago
The presence of any of the following changes helps us to determine that a chemical reaction has taken place.
- Formation of new substance(s)
- Change in state
- Change in colour
- Change in temperature
- Formation of a precipitate
- Evolution of a gas
For example, if on mixing two substances a gas is evolved, then we can say that a chemical reaction has taken place.
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Like any wave, the speed of a light wave is dependent upon the properties of the medium. In the case of an electromagnetic wave, the speed of the wave depends upon the optical density of that material. The optical density of a medium is not the same as its physical density.
Posted by Aashna Naik 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
The jejunum is one of three sections that make up the small intestine. The small intestine is part of the digestive system and is vital for breaking down and absorbing nutrients. It extends from the pyloric sphincter of the stomach to the ileocecal valve that connects the small intestine to the large intestine.
Posted by Rajiv Kumar 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
| Cellular Respiration | Photosynthesis |
| Occurs in all living organisms. | Occurs only in all green plants, algae, and in some bacteria. |
| The entire process occurs in Mitochondria. | The entire process occurs in Chloroplasts. |
| Glucose and oxygen are the reactants of this process. | Carbon dioxide, water, and light energy are the reactants of this process. |
| Carbon dioxide, water, and energy (ATP) are the by-products. | Glucose, oxygen, and water are the by-products. |
| Undergoes Catabolic Process. | Undergoes Anabolic Process. |
| Oxygen is taken in and carbon dioxide is liberated out. | Producing food and capturing energy. |
| In this process, food particles are broken down to release energy. | In this process, food is synthesis by capturing the energy. |
| It is an exergonic reaction as energy is released. | It is an endothermic reaction as it requires energy. |
| This process does not require sunlight since cellular respiration occurs all the time. | This process requires sunlight since photosynthesis occurs only in the presence of sunlight. |
|
The chemical reaction of cellular Respiration is C6H12O6 + 6O2 → 6CO2 + 6H2O |
The chemical reaction of photosynthesis is 6CO2 + 6H2O → C6H12O6+ 6O2 |
Posted by Samreet Brar 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
| Sl. No. | Differentiating Property | Physical Change | Chemical Change |
| 1 | Explanation | 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. |
| 2 | Example | 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. |
| 3 | Reversibility | Physical change is easily reversible i.e original substance can be recovered. | Chemical change is irreversible i.e. original substance cannot be recovered. |
| 4 | Formation of new substance | In physical change, no new substance is formed. | A chemical change is always accompanied by one or more new substance(s). |
| 5 | Type of Change | Physical change is a temporary change. | Chemical change is a permanent change. |
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Yogita Ingle 5 years, 8 months ago
| Genotype | Phenotype |
| The hereditary information of the organism in the form of gene in the DNA and remains the same throughout the life. | The characters of an organism which are visible are known as phenotypes. |
| Same genotype produces same phenotype. | Same phenotype may or may not belong to same genotype. |
| Present inside the body as genetic material. | Expression of genes as the external appearence. |
| The genotype is inherited from the parent to the offspring. | The phenotype is not inherited from the parent. |
| It can be determined by scientific methods such as the polymerase chain reaction. | It can be determined by observing the organism. |
| It is affected by genes. | It is affected by genotype and environmental conditions. |
| For eg., Blood group, eye colour, height, genetic diseases. | For eg., Weight, physique, beak of birds |
Posted by Hema Sri 5 years, 8 months ago
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Tarun Sharma 5 years, 8 months ago
Yogita Ingle 5 years, 8 months ago
Silver has the lowest resistivity. Hence, silver is the best conductor.
Posted by Hema Sri 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Given that,
length {tex}l_{2}=2l_{1}{/tex}
The resistance of the wire is equal to the product of resistivity of the material and length of the wire divided by the area of cross section.
The resistance of the wire is defined as,
{tex}R = \dfrac{\rho l}{A}{/tex}
Where, \rho= resistivity of the material
A = area of cross section
R = resistance of the wire
The volume of both wire is same.
The volume of original wire = volume of new wire
So,{tex}V_{1}=V_{2}{/tex}
{tex}A_{1}l_{1}=A_{2}l_{2}{/tex}
If a wire is stretched to double its length
{tex}l_{2}=2l_{1}{/tex}
Then, {tex}A_{1}l_{1}=A_{2}\times2l_{1}{/tex}
{tex}A_{2}=\dfrac{A_{1}}{2}{/tex}
The resistivity of the material is ,
{tex}\rho = \dfrac{RA}{l}{/tex}
The resistivity of the material of the original wire is
{tex}\rho = \dfrac{R_{1}A_{1}}{l_{1}}.....(I){/tex}
The resistivity of the material of the new wire is
{tex}\rho' = \dfrac{R_{2}A_{2}}{l_{2}}.....(II){/tex}
The ratio of the resistivity of the material of the wire is
{tex}\dfrac{\rho}{\rho'}=\dfrac{ \dfrac{R_{1}A_{1}}{l_{1}}}{ \dfrac{R_{2}A_{2}}{l_{2}}}{/tex}
Put the value in the equation
{tex}\dfrac{\rho}{\rho'}=\dfrac{R_{1}2A_{1}2l_{1}}{R_{2}A_{1}l_{1}}{/tex}
{tex}\dfrac{\rho}{\rho'}=\dfrac{4R_{1}}{R_{2}}{/tex}
{tex}\rho'=\dfrac{\rho R_{2}}{4R_{1}}{/tex}
Hence, The new resistivity of the material of the wire is {tex}\dfrac{\rho R_{2}}{4R_{1}}.{/tex}
Aadya Singh 5 years, 8 months ago
Posted by Chetna Mishra 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side. Balancing chemical equations is a process of trial and error.
Hema Sri 5 years, 8 months ago
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Vipin Jain 5 years, 8 months ago
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