ATP Education Logo

The Secure way of Learning

   Welcome! Guest

LogIn    Register       


Sponser's Link
Sponser's Link

Sponser's Link

Join Us On Facebook
CBSE And NCERT Solutions:

CBSE Notes for Class 10 Science english Medium 1. Chemical Reactions and Equations

Select Your Subject: CBSE English Medium


CBSE NotesClass 10th Science Chapter 1. Chemical Reactions and Equations:
Page 4 of 5

1. Chemical Reactions and Equations


Writing Symbols of physical states


Writing Symbols of physical states


Physical states tell us about the visible forms of elements/compound. Above both the balanced equations do not tell us anything about the physical state of elements / molecules of reactant and product.

To make a chemical equation more informative, the physical states of the reactants and products are mentioned along with their chemical formulae. The gaseous, liquid, aqueous and solid states of reactants and products are represented by the notations (g), (l), (aq) and (s), respectively.


The word aqueous (aq) is used when reactant or product is soluble in water or dissolve in water.

Now applying these symbols of physical  state we have the balanced equation – I

3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4H2(g)


// Here we see that H2O is gaseous state it means it is water  vapour or steam. //

Writing medium/condition in presence of which reaction takes place


Sometimes we write the reaction conditions like temperature, pressure and catalyst etc. i.e. heat, sunlight, catalyst like nickel, palladium, chlorophyll etc.  





Precipitation Reaction: 

Any reaction that produces a precipitate can be called a precipitation reaction.

Na2SO4(aq) + BaCl2(aq) → BaSO2(s) + 2NaCl(aq)

(Sodium sulphate) + (Barium chloride)  (Barium  sulphate) + (Sodium chloride)

The white precipitate of BaSO4 is formed by the reaction of SO4 and Ba. The other product formed is sodium chloride which remains in the solution.

This white precipitate BaSO4 is insoluble in water; 

Precipitate: This insoluble substance formed is known as a precipitate.



Page 4 of 5
Download Our Android App
Get it on Google Play
Feed Back

Roshan Class X says:


Shadab Khan Class X says:

"make fast all science pages geography "

Shivam Bajpai All Class says:

"ये पेज under construction क्युं है .plz fix this prob..."

Krishan Class X says:

"this very good website i really appreciate which provide no cost education to all medium classes"

Vimal Class XI says:

"Not able to find the instructed."

Kamini Class X says:

"every chepter is imcomplete....this side is not useful"

Ashok Swami All Class says:

"10th science ka Lesson-8 ka page no.5 kab take under construction rahega please improve it."

Rishabh Gupta Class XI says:

"how can i understand difference between permutation and combination word problem"

Rishabh Gupta Class XI says:

"i want to learn parts of speech"


"Please update all the syllabus of class 8"

ATP Education



Follow us On Google+
Join Us On Facebook
Sponser's Link
Sponser's Link