Question

6. Write one of the reactions for each of the following characteristics :

(b) change of state

Answer 1

Part 1: Chemical Reaction

A chemical reaction may take place when two or more reactants come in contact with one another resulting in the formation of new substances called products accompanied by the transfer of energy among them.

Part 2: Change of state

• Certain chemical reactions are characterized by a change in state.
• There are three states of matter Solid(s), liquid(l), and gas(g)
• For example, two volumes of hydrogen gas react with one volume of oxygen gas to form water which is in a liquid state.
• $\underset{\mathrm{Hydrogen}\mathrm{gas}}{2{\mathrm{H}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}\mathrm{gas}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Water}}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$