Question

give 20 examples of physical change . explain with irreversible and reversible physical change .
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Answer 1

Explanation:

Definition of Physical Changes

Matter makes up everything we can see in the universe. Since matter is not ever created or destroyed, it changes form to cycle through the world. In science, physical changes of matter are when the look, feel, or smell of it changes, but the chemical properties do not.

Physical changes typically impact the state of matter. Physical changes can be irreversible or reversible.

Characteristics of Physical Changes

During a physical change, one or more physical properties, or characteristics, of the matter change. Physical properties include:

Color

Density

Luster

Malleability

Mass

Solubility

State

Temperature

Texture

Viscosity

Volume

Physical Change vs. Chemical Change

Unlike many physical changes, many chemical changes are not visible. Chemical changes happen on a molecular level and alter the actual makeup of the matter. In order for a change to be only a physical change, by definition it can’t change chemical properties.

Examples of Physical Changes You See Every Day

You may not realize that you see examples of physical change every day. Think about how you might change the look or feel of different items without altering their chemical makeup.

Everyday Examples of Physical Changes With Water

The physical changes of water are easy to see at home, at work, or even in nature.

An ice cube melting into water in your drink

Freezing water to make ice cubes

Boiling water evaporating

Hot shower water turning to steam

Steam from the shower condensing on a mirror

Common Examples of Physical Changes in Your Kitchen

Your kitchen is one of the most common places you probably see physical changes happen on a regular basis.

Crushing an empty milk carton

Boiling pasta to make it soft

Dissolving sugar in your coffee

Shaking up a bottle of Italian dressing

Freeze-drying fruits

Thawing raw meat

Chopping a vegetable into pieces

Melting candy

Dissolving a drink mix into water

Adding milk to cereal

Sharpening a knife

Freezing juice into popsicles

Adding food dye to white icing

Coloring Easter eggs

Mixing fruits in a fruit salad

Letting gelatin set in the fridge

Answer 2

Answer:

• Crushing a can
• Melting an ice cube
• Boiling water
• Mixing sand and water
• Breaking a glass
• Dissolving sugar and water
• Shredding paper
• Chopping wood
• Mixing red and green marbles
• Sublimation of dry ice
• Crumpling a paper bag
• Melting solid sulfur into liquid sulfur. This is an interesting example since the state change does cause a color change, even though the chemical composition is the same before and after the change. Several nonmetals, such as oxygen and radon, change color as they change phase.