Chemical and Physical Changes




Chemical and Physical Changesgasoline burning (water vapor and carbon dioxide form)

iron rusting (iron oxide forms)

bread rising (yeast converts carbohydrates into carbon dioxide gas)

eggs cooking (fluid protein molecules uncoil and crosslink to form a network)

suntanning (vitamin D and melanin is produced) 

milk souring (sour-tasting lactic acid is produced)

Physical change rearranges molecules however does not affect their inner structures. Some physical change are:

whipping egg whites (air is pressured into the liquid, but no new substance is made)

magnetizing a compass needle (there is realignment of groups of iron atoms, however no real change in the iron atoms themselves). 

Examples of Chemical and Physical Changes

A chemical change generates a fresh substance, although a physical change will not. A material may change forms or shapes while going through a physical change, however no chemical reactions take place and no new compounds are created.

Examples of Physical Changes

melting an ice cube

crumpling a sheet of paper

breaking a bottle

casting silver in a mold

Examples of Chemical Changes

dissolving salt in water

burning wood

digesting food

mixing acid and base

In some instances, it may be difficult to tell whether a physical or chemical change happened. For example, whenever you dissolve sugar in water, a physical change takes place. The form of the sugar changes, but it stays the same chemically. However, whenever you dissolve salt in water the salt dissociates into its ions therefore a chemical change occurs.

List of Chemical and Physical Changes

The changes could be of two kinds, chemical changes and physical changes.

Physical Changes:

Physical changes are changes within the physical properties of substances for example size, shape, colour and state of substances. No new substances are created in these changes.

Melting of ice, folding of paper and boiling of water are a few of the examples of physical change.

Physical changes could be reversible.

Chemical Changes:

A change where a number of new substances are created is referred to as a chemical change. A chemical change is also known as a chemical reaction. All new substances are created as a result of chemical changes.

Cooking of food, burning of paper and rusting of iron articles are a few of the examples of chemical change.

Chemical changes are always irreversible

Here is the List of Chemical and Physical Changes:

Chemical Changes:

spoiled food

baking a cake,

smelling different types of food

Burning firewood is also considered chemical changes.

Physical Changes:

melting an ice cube,

crushing a can,

mixing sand and water,

boiling water

dissolving sugar

breaking a glass

shredding paper,

water

mixing red and green marbles. 

chopping wood

Rusting:

Rusting is actually a chemical change that impacts iron articles and gradually destroys them.

The procedure of rusting is symbolized by the following equation:

Iron (Fe) + Oxygen (O2 from the air) + water (H2O) ——-> Rust (iron oxide Fe2O3)

For rusting, the existence of both water (or water vapour) and oxygen is important.

Methods of Avoiding Rusting:

Painting

Greasing

Galvanization

The operation of depositing a layer of zinc upon iron is known as galvanisation.

Crystallisation:

Crystallisation is a physical change where large crystals of genuine substances are created from their solutions.



Latest Articles


Interesting Facts about Platinum

Scientists analyzed samples of the metal following European exploration of the region started. Platinum has been used by ancient people in Central and South America.

Cool Facts about Gold

Not many chemicals can attack gold, so that’s why it maintains it shine even when buried for 1000’s of years. When compared with other metals, gold is much softer. One can beat 1 gram of gold to a 1 square meter sheet and light would shine via that sheet.

Interesting Facts about Wind Energy

One wind turbine can power as much as 500 homes. Wind mills date all the way back to the year 2000 BC where they were utilized in China.

Interesting Facts about Fruit

Fruit is beautiful, tasty and great for all us. Fruit is also interesting. Listed here is a brief collection of interesting facts about fruit.

Facts about the Rock Cycle

Liquid rock which cools quickly after exposure to the Earth’s atmosphere are fine-grained and known as extrusive. Obsidian is an example of this kind of rock.