Answer to Question #32139 in Chemistry for maimuna

Question #32139
what are the examples of chemical changes and what are their characteristics
Expert's answer
Chemical changes – the changes that occur as a result of chemical reaction (a substance combines with another to form a new substance or decomposes into two or more different substances).

We know that chemical reaction occurs when there is

•Change of color (for example, silver to reddish-brown when iron rusts).
•Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.
•Change of form - paper turning to ash when burned.
•Light, heat, or sound given off.
•Formation of gases, often appearing as bubbles in liquids.
•Formation of a precipitate (insoluble particles).
•The decomposition of organic matter (for example, rotting food).

The examples of chemical changes also are
1. combustion (burning) of wood
2. metabolism of food in the body
3. mixing an acid and a base, such as hydrochloric acid (HCl) and sodium hydroxide (NaOH)
4. cooking an egg
5. mixing baking soda and vinegar to produce carbon dioxide gas
6. baking a cake
7. electroplating a metal
8. using a chemical battery

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