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Posted by Karrhik K.U 5 years, 9 months ago
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Meghna Thapar 5 years, 7 months ago
Flammable and inflammable are two words that cause confusion. ... While flammable is the preferred modern term for a material that catches fire readily, inflammable has the same meaning. The opposite, a material that won't burn easily, is either not-flammable or non-flammable. At room temperature petrol remains in a liquid state. When petrol burns, it isn't the liquid that burns, but the flammable vapours that are dispersed from the flammable liquid. Therefore the more easily an organic compound vaporizes, the more volatile or flammable it will be.
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Mamun??? Papa'S Dear 7 years, 4 months ago
Posted by Sanjana Zangaruche 7 years, 4 months ago
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Meghna Thapar 5 years, 7 months ago
A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity. ... They can also be useful to identify an unknown substance or to separate or purify it from other substances. In chemistry, a property is any aspect of a substance which is only seen by means of a chemical reaction. Simply speaking, chemical properties cannot be determined just by viewing or touching the substance.
Posted by Mohit Kumar 7 years, 4 months ago
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Dev Raut 7 years, 4 months ago
Posted by Abdul Qadir Khan 7 years, 4 months ago
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Posted by Lakhan Jee 5 years, 9 months ago
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Meghna Thapar 5 years, 7 months ago
Steps Involved in Balancing a Chemical Equation:
Consider the chemical reaction between magnesium and oxygen to understand the steps involved in balancing a chemical equation.
Step 1:
Let us first write the word equation for this reaction.
Magnesium + Oxygen → Magnesium oxide
Step 2:
Write the chemical equation for the reaction between magnesium and oxygen.
Mg + O2 → MgO
Step 3:
Count the number of atoms of an element occurring on both L.H.S. and R.H.S. in this equation.
Mg + O2 → MgO
|
Component |
Reactant |
Product |
|
Magnesium |
1 |
1 |
|
Oxygen |
2 |
1 |
This is an unbalanced equation.
Step 4:
To balance a chemical equation, first draw boxes around each formula. Do not change anything inside the boxes while balancing the equation.
Choose a reactant or a product which has the maximum number of atoms in it.
In that compound, select the element which has the maximum number of atoms. In this equation we shall select MgO i.e. magnesium oxide and the element oxygen in it.
To balance the oxygen atoms, let us multiply magnesium oxide molecule by 2 on the right hand side.
|
Component |
Reactant |
Product |
|
Magnesium |
1 |
1 x 2 = 2 |
|
Oxygen |
2 |
1 x 2 = 2 |
Step 5:
There are two oxygen atoms on either side of the equation but one magnesium atom on the reactant's side and two on the product's side. Therefore, multiply the magnesium atom by 2 on the left hand side.
|
Component |
Reactant |
Product |
|
Magnesium |
1 x 2 = 2 |
2 |
|
Oxygen |
2 |
2 |
Therefore, the number of atoms of each element of reactants = The number of atoms of each element of products.
Step 6: Writing Specific Conditions on the Arrow
The reaction is carried out in the presence of ‘Heat’. On heating, magnesium combines with oxygen present in air to form magnesium oxide.
Step 7: Writing Symbols of Physical States
The various ways in which a chemical equation can be made more informative are : (i) By indicating the physical states of the reactants and products. Example: Solid state is indicated by the symbol (s).
(ii) By indicating the heat changes taking place in the reaction. For Example: An exothermic reaction is indicated by writing “+Heat” or “+Heat energy” or “+Energy” on the products side of an equation.
(iii) By indicating the “conditions” under which the reaction takes place.
Example: Delta stands for heat which is written on the arrow sign in the equation.
Posted by Nidhi Roy 7 years, 4 months ago
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Sonali Aggarwal 7 years, 4 months ago
Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat and light.The light which is given off during combustion can be in the form of a flame or a glow.
Mohit Kumar 7 years, 4 months ago
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Meghna Thapar 5 years, 7 months ago
Higher calorific value means the total quantity of heat liberated from combustion of unit mass or unit volume of given fuel when by products/side products are allowed to cool at room temperature. The SI unit (international system of units) of calorific value is Joule/Kg or Kilo Joule/Kg.
Posted by Latik Joshi 7 years, 4 months ago
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Meghna Thapar 5 years, 7 months ago
Ammonium chloride is separated from common salt by the process of sublimation. ... Sublimation is the process where substance is transferred from solid state to liquid state without passing thorough liquid state. Solid The mixture of ammonium chloride and common salt is taken in to china dish. There are way in separating mixtures of chlorides salts such as that of sodium chloride and ammonium chloride. It can be done by crystallization, filtration or sublimation. The easiest method among the three is separation by sublimation. Ammonium chloride sublimes upon heating.
Posted by Manthan Dhanwal 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
The earth surrounded by a layer of air. Air has weight and it exerts pressure on the earth's surface. The pressure exerted by the atmosphere on the surface of the earth is called the atmospheric pressure.Atmospheric pressure varies from place to place. Atmospheric pressure decreases with increasing elevation. Moist air exerts less pressure as it contains less nitrogen and oxygen than dry air and is less dense.
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Meghna Thapar 5 years, 7 months ago
There are two types of mechanical waves: Longitudinal waves – In this type of wave, the movement of the particle are parallel to the motion of the energy i.e. the displacement of the medium is in the same direction to which the wave is moving. Example – Sound Waves, Pressure Waves. There are two basic types of wave motion for mechanical waves: longitudinal waves and transverse waves.
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Shreya Rana 7 years, 4 months ago
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