Question

Define a chemical reaction state four observation which help us to determine that a chemical reaction has taken place write one example of each observation with a balance chemical equation?

Answer 1

Hey student!;)

Here is ur Ans:-

A chemical reaction is the process in which chemicals react to form new compounds where there atomic mass are equal on both the sides.

The observation we can conclude from chemical reaction is that

1 change of state ( when we react quick lime with water )

2 Change of colour (when we react zinc granules with ferrous sulphate)

3 change in temperature( any exothermic or endothermic reaction)

4 evolution of gas (when we react zinc sulphate with water H^2 gas is evolved)

5 form of precipitate (any double displacement reaction )

Hope it helps you!...

:*P*

Answer 2

Answer:

THE METHOD OF REPRESENTING A CHEMICAL REATION WITH THE HELP OF SYMBOLS AND KNOWN AS A CHEMICAL EQUATION

1. CHANGE IN COLOUR:Fe+CUSO4---->FeSO4+Cu
2. CHANGE IN TEMPERATURE: Ca+H2O---->Ca[ON]2+HEAT
3. CHANGE IN STATE: Mg+O2--->MgO
4. FORMATION OF PRECIPITATION: Ca[OH]2+CO2--->CaCO3

THANK YOU