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Sia ? 1 year, 6 months ago
Instantaneous Rate vs Average Rate | |
Instantaneous rate is the rate of a chemical reaction that is measured as the change of the concentration of reactants or products during a known time period. | Average rate is the rate of a chemical reaction that is measured as the change of the concentration of reactants or products during the whole time period of the progression of the chemical reaction. |
Time | |
Instantaneous rate is measured for a particular moment or for a very short time period. | Average rate is measured for a longer time period. |
Formula for Calculation | |
Instantaneous Rate of Change = Lim (t→0) [Δ(concentration of reactant or product) /Δ(time)] | Average Rate of Change = Δ(concentration of reactant or product) /Δ(time) |
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Gaurav Seth 2 years, 3 months ago
The Changing of a solid directly into vapours on heating,and of vapours into solid on cooling is called as sublimation.
The solid substance which undergoes sublimation is called sublime.
The solid obtained by cooling the vapours of the solid called a sublimate.
For Ex:camphor,Iodine,Ammonium Chloride,Naphthalene etc.
Posted by Hemlata Narang 2 years, 4 months ago
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Meghna Thapar 2 years, 4 months ago
Tyndall effect can be defined as the scattering of a beam of light by colloidal particles present in a colloidal solution. This effect can be observed when a fine beam of light passes through a small hole in a dark room. This effect occurs due to the scattering of light by particles of dust or smoke present in the air.
The Tyndall effect can also be observed when sunlight passes through the canopy of a dense forest. In the forest, the mist contains tiny droplets of water which act as colloidal particles dispersed in the air.
Posted by Tse Ngodup 2 years, 5 months ago
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Yogita Ingle 2 years, 5 months ago
- An atom consists of heavy positively charged nucleus. The whole mass of the atom is concentrated in the nucleus.
- The electrons in an atom revolve around the nucleus in definite circular paths called orbits or energy level.
- Each energy level is associated with definite amount of energy.
- The change in energy takes place when electron jumps from one energy level to another energy level.
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Gaurav Seth 2 years, 6 months ago
Acids | Bases |
i) Acids are sour in taste. | i) Bases are bitter in taste. |
ii) Acid turns blue litmus to red. | ii) Bases turn red litmus to blue. |
iii) Acid is a substance which contains hydrogen ion H+. | iii) Bases are substances which contain hydroxyl ion OH−. |
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