Question

Write word equations for two chemical reactions with the help of materials given in the box. [Air, copper sulfate, iron, vinegar, iron oxide, carbon dioxide, iron sulfate, copper, lime water, water]

Answer 1

Chemical reaction

• A chemical reaction is a process by which one chemical substance changes into another chemical substance.
• For example, iron rusts, coal burns, candles burn, papers burn, milk sets into cottage cheese or ghee, food digests, etc.
• A chemical change occurs during a chemical reaction because a product substance is formed that has entirely different characteristics from the original substance.

Word chemical reactions

1. The reaction is as follows:

$\mathrm{Iron}+\mathrm{Air}+\mathrm{Water}\to \mathrm{Iron}\mathrm{oxide}$

• The iron oxide (rust) is formed by a redox reaction between oxygen and iron in a water-containing environment.

2. The reaction is as follows:

$\mathrm{Copper}\mathrm{sulfate}+\mathrm{Iron}\to \mathrm{Iron}\mathrm{sulfate}+\mathrm{Copper}$

• When an iron nail is placed in a copper sulfate solution, iron displaces copper from the solution because iron is more reactive than copper.