# Category: science

We are trying our best to compile all the topics related to science up-to secondary level.

chemistry 0

## What is the hybridisation of Cl2? Is it different from the hybridisation of F2 molecules?

Here you can see the hybridization of both is same , both of these two elements have seven electrons in outermost shell and blow is the diagram showing the electrons filling in s-subshell and p-subshell . one orbital of s- subshell and three orbitals of p-subshell are used during hybridization. So the type of hybridization is sp3 hybridisation.

chemistry 0

## What will be the volume of water when it is heated from 0 degrees Celsius to 10 degrees Celsius?

According to CHARLES LAW “At constant pressure, The volume of a given mass of a gas increases or decreses by 1/273 of its volume at 0 ͦ  degree C for every one degree centigrade rise or fall in temperature”. Vol at 10 = vol at zero + 10 x vol at zero/273

chemistry 0

## How many oxygen atoms are there in 90g of H2O molecule?

1 molecule of H2O has 1 atom of oxygen. Firstly we will calculate the number of atoms in 90g of H2O. we will explain it in two steps:- Step I:- No.of moles of H2O = given mass / molar mass No. of moles = 90/18 = 5 moles No. Of molecules = No. of moles x Avogadro number =5 x […]

chemistry 1

## What is the number of moles of O-atom in 126 AMU of HNO3?

Here we have 126 AMU of HNO3, Molar mass of HNO3 is 1+14+16×3 = 63amu Number of molecules of HNO3 are = 126/63 = 2 Here we have 2 molecules Each molecule have 3 atoms of oxygen. So no. of oxygen atoms= 3×2 =6 atoms No. Of moles = given particles/ avogadro number No. of moles of oxygen = 6 […]

chemistry 0

## Why methanoic acid is stronger than ethanoic acid?

In case of methanoic acid the carbon atom joined to the carboxyl group is attached to only hydrogen atoms which are not able to increase the electron density. HCOOH  But […]

chemistry 0

## How does the normality of a mixture equation change for different solutes?

Actually normality depends upon a simple formula that is :- Normality = Number of Gram equivalents / litre The term gram equivalents change as the valency of a substance changes . all the elements do not have same valence and hence it varies from element to element or molecule to molecule. And the term gram equivalents is calculated as follows […]

chemistry 0

## A chemical bond

Chemical bond may be defined as the force of attraction by which two atoms are held together. The chemical bonds lead to the formation of molecules and crystals. There are […]

science 0

## Terms related to mass

Atomic mass Atomic mass of an element is the relative mass as compared with an atom of carbon 12 and it is expressed in AMU. A.M.U. AMU is the Atomic mass unit and it is defined as the mass equal to 1 by 12th of the mass of carbon 12 isotope. 1 amu = 1.66056x 10-24 Molecular mass It is […]

science 0

## Various separating methods

We come across the various kind of mixtures in our daily life that have different kind of components and sometimes we have to separate the components for our benefit and […]

chemistry 0

## What are the ions produced when sulfuric acid ionises?

sulfuric acid ionizes to give us hydronium ion and sulfate ion. H2SO4 (aq) → 2H+ + SO4

chemistry 0

## Neutralisation reaction

The reaction between an acid and base to give salt and water is called neutralisation reaction. here in the following reaction we can easily see how Hydrochloric acid is reacting with sodium chloride NaOH + HCl ———> NaCl + H2O the nature of salt formed is dependent on the type of acid or base , if there is any difference then […]

chemistry 0

## Atomic models

Thomson’s model of an atom Thomson proposed the model of an atom to be similar to that of the Christmas pudding. Thomson proposed that An atom consists of a positively […]

chemistry 0

## Atomic Structure

Dalton’s Atomic Theory In 1808 John Dalton published a new system of chemical philosophy in which he propose the following theory :- Matter consist of indivisible atoms. All the atoms […]

science 1

## The mysterious book.

This story is a real dream just jotted down on Page. I saw this dream in the night of 27 April 2020. In my dream I was recruited as a […]

chemistry 1

## Distillation and fractional distillation.

Distillation is a type of separating process in which two miscible liquids are separated from each other by using their different boiling points. the one with lower boiling point , […]