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Many changes are taking place
around us on their own. In the fields,
the crops change from time to time.
Sometimes, leaves fall from trees, change
colour and dry out. The flowers bloom
and then wither away. Are any changes
happening in your body? Your nails
grow, your hair grows, you grow taller
and your weight increases as you grow.
Did you realise earlier that so many
changes are taking place around you all
the time?
Let's have a look at different types of changes

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A VIDEO ON PHYSICAL AND CHEMICAL CHANGES

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CHARACTERICTICS OF PHYSICAL AND CHEMICAL CHANGE

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Song of Physical changes

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EXAMPLES OF PHYSICAL AND CHEMICAL CHANGE

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EXAMPLES OF PHYSICAL AND CHEMICAL CHANGE

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Are you confused about the difference between chemical changes and physical changes and how to tell them apart? In a nutshell, a chemical change produces a new substance, while a physical change does not. A material may change shapes or forms while undergoing a physical change, but no chemical reactions occur, and no new compounds are produced.

There are also other indications of chemical and physical changes, such as odor and sound. Here is a look at how to recognize the two types of changes, along with telltale indications and common examples of each.

Key Takeaways

Examples of Chemical Changes

A new compound (product) results from a chemical change as the atoms rearrange themselves to form new chemical bonds. A chemical change always involves a chemical reaction. The starting materials and final product are chemically different from one another. Here are some examples of chemical changes:

Burning wood

Souring milk

Mixing acid and a base

Digesting food

Cooking an egg

Heating sugar to form caramel

Baking a cake

Rusting of iron

Examples of Physical Changes

No new chemical species forms in a physical change. Changing the state of a pure substance between the solid, liquid, or gas phase is a physical change since the identity of the matter does not change. A physical change involves changes in physical properties, but not chemical properties. For example, physical properties change during tempering steel, crystallization, and melting. Here are examples of physical changes:

Crumpling a sheet of aluminum foil

Melting an ice cube

Casting silver in a mold

Breaking a bottle

Boiling water

Evaporating alcohol

Shredding paper

Sublimation of dry ice into carbon dioxide vapor

Carbon changing from graphite into a diamond

How to Tell Physical and Chemical Changes Apart

Look for an indication that a chemical change occurred. Signs of a chemical change include the following:

Gas is produced. In liquids, bubbles may form.

An odor is produced.

The substance changes color.

Sound is produced.

There is a temperature change. The surroundings become either hot or cold.

Light is produced.

A precipitate forms.

The change is difficult or possible to reverse.

A chemical change might not display all of these signs. If you don't see any of these indications, a physical change likely occurred. Be aware a physical change may produce a dramatic change in the appearance of a substance. This doesn't mean a chemical reaction occurred. The only way to know for certain whether a change is chemical or physical is a chemical analysis of the starting and ending materials.

In some cases, it may be hard to tell whether a chemical or physical change occurred. For example, when you dissolve sugar in water, a physical change occurs. The form of the sugar changes, but it remains the same chemically (sucrose molecules). However, when you dissolve salt in water, the salt dissociates into its ions (from NaCl into Na⁺ and Cl⁻), so a chemical change occurs. In both cases, a white solid dissolves into a clear liquid, and in both cases, you can recover the starting material by removing the water, yet the processes are not the same.

Explore chemical and physical changes in greater detail. Learn how they relate to the chemical and physical properties of matter with these additional resources.

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What Are Examples of Chemical and Physical Changes?

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Here are some examples of physical changes and chemical changes, along with an explanation of how you can tell the two apart.

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DAILY LIFE EXAMPLES