Dr. K C Trikha and N K Sehgal Solutions for Chapter: Chemical Substances and Processes, Exercise 1: Something To Know

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

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: $\mathrm{CaO} \left(\mathrm{s}\right)+{\mathrm{SiO}}_2 \left(\mathrm{g}\right)\to {\mathrm{CaSiO}}_3 \left(\mathrm{s}\right)$.

Classify the following reactions into different types, giving reason: $\mathrm{KOH} \left(\mathrm{aq}\right)+\mathrm{HCl} \left(\mathrm{aq}\right)\to \mathrm{KCl} \left(\mathrm{aq}\right)+{\mathrm{H}}_2\mathrm{O} \left(\mathrm{l}\right)$.

Classify the following reactions into different types, giving reason: $\mathrm{Cu} \left(\mathrm{s}\right)+2{\mathrm{AgNO}}_3\left(\mathrm{aq}\right)\to \mathrm{Cu}({\mathrm{NO}}_3{)}_2 (\mathrm{aq})+2\mathrm{Ag} (\mathrm{s})$.

Classify the following reactions into different types, giving reason: ${\mathrm{BaCO}}_3 \left(\mathrm{s}\right)+\mathrm{heat}\to \mathrm{BaO} \left(\mathrm{s}\right)+{\mathrm{CO}}_2 \left(\mathrm{g}\right)$.