Question

Answer the following questions.
1.
Write the steps involved in writing the chemical formula of calcium phosphate.
2
.
How is a chemical change different from a physical change?
Neutralisation reaction is a chemical change.' Justify this statement with the
help of an example.
Define a decomposition reaction and give an example of the same.
Classify the following reactions into different types, giving reason.
(a) CaO(s) + Sio,(g)
- Casio (s)
(b) KOH(aq) + HCl(aq) -KCl(aq) + H2O(1)
COMO
Ace​

Answer 1

when a chemical compound decomposes on heating or absorbing some other kind of energy , so as to form two or more new substances then the chemical reaction is called chemical decomposition reaction .

1. 2HgO ____ 2Hg + O2

Answer 2

Write the steps involved in writing the chemical formula of calcium phosphate

Formula of calcium phosphate=Ca3(PO4)

How is a chemical change different from a physical change?

Physical changes only change the appearance of a substance, not its chemical composition.  while Chemical changes cause a substance to change into an entirely substance with a new chemical formula.

Neutralisation reaction is a chemical change.' Justify this statement with the

help of an example.

Neutralization reaction is a chemical change it envolves the reaction of base and an acid who gives two new compounds, water and salt.

For eg. Hcl+Naoh----> Nacl+ H2O. In neutralisation reaction the acid and base reacts to form salt and water so there is chemical change that is new compounds are formed

Define a decomposition reaction and give an example of the same.

A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more elements or new compounds. These reactions often involve an energy source such as heat, light, or electricity that breaks apart the bonds of compounds.

For example, CaCO3→CaO+CO2.

Classify the following reactions into different types, giving reason.

(a) CaO(s) + Sio,(g)

- Casio (s)

(b) KOH(aq) + HCl(aq) -KCl(aq) + H2O(1)

COMO

(a) Synthesis reaction

(b) Neutralization reaction,as salt and water are formed