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Periods

Menstrual cycle

Menstrual cycle is the series of cyclic changes that occur in the reproductive tract of human females with a periodicity of 28 days. It is characterized by loss of vaginal blood...

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Chemistry. Midterm exam 2021...

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Young's Double Slit Experime...

Check out the Young's Double Slit Experiment Visualization made by Joon Shakya to gain knowledge in a exciting and fun waySwipe to change the view. Click here to view it in sepa...

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Loveee

O Love!

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Qbasic Coding Challenge for ...

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Simple program to create Roc...

This is a simple program to create a rock, paper, scissors game that we used to play in our childhood.Note: This is a simple program and there is no graphical interferencefrom r...

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Biology | Annual exam 2020 |...

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The universal law of Gravita...

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Mister prabin

The combination or displacement that occurs in the molecules of matter during a chemical change called a chemical reaction. Any two examples are:

  1. 2H2 + 02 -------> 2H20
  2. H2SO4 + Zn ---------> ZnSO4 + H2

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Mister prabin

A chemical reaction in which an atom of a compound is displaced by another element is called a displacement reaction. Its types are:

  1. Single displacement rxn.
  2. Double displacement rxn.

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Mister prabin

The atomic weight of an element expressed in grams is called gram atomic weight.

The molecular weight of a substance expressed in grams is called molecular weight.

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Mister prabin

The positive change in the concentration of a reactant or a product per unit time is called the rate of a chemical reaction. Any four factors that affect the rate of a chemical reaction are:

  1. The concentration of reactants
  2. Temperature
  3. Physical nature of reactants
  4. Chemical nature of reactants

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Mister prabin

We know, a chemical reaction in which an acid and base react together to give salt and water is called an acid-base reaction. Here acidic and basic nature et compounds are neutralized. So, it called a neutralization reaction.

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Mister prabin

A catalyst is a chemical substance that increases or decreases the rate of a chemical reaction without taking part in a chemical reaction.

The +ve catalyst is the chemical substance that increases the rate of a chemical reaction. For example MnO2The catalyst is the chemical substance that decreases the rate of a chemical reaction. For example glycerine.

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