list out 4 physical and chemical changes around you. And find which out of them are reversible and irreversible
Answers
Answer:
Examples of Physical Changes
Crushing a can.
Melting an ice cube.
Boiling water.
Mixing sand and water.
Breaking a glass.
Dissolving sugar and water.
Shredding paper.
Chopping wood.
Answer:
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 base
-Digesting food
-Cooking an egg
-Heating sugar to form caramel
-Baking a cake
-Rusting of iron
Examples of Physical Changes
Examples of Physical ChangesNo new chemical species forms in a physical change. Changing the state of a pure substance between solid, liquid, or gas phase is a physical changes 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
Examples of reversible changes
Melting: Melting is when solid converts into a liquid after heating. Example of melting is turning of ice into water.
Freezing: Freezing is when a liquid converts into a solid. Example of freezing is turning of water into ice.
Boiling: Boiling is when a liquid converts into a gas. Example of boiling is turning water into water vapour.
Examples of irreversible changes
Burning: When we burn a piece of paper or wood, it turns to ash and smoke. We cannot obtain paper and wood from the ash again.
Cooking: We use heat for cooking, right? Once we cook our eggs, we cannot uncook them. Therefore, cooking is an irreversible change.
Rusting of iron: You must have seen rusting of iron. When water vapour (humidity) comes in contact with the iron, they react. Therefore, iron rusts and once this happens, we cannot reverse it.
Hope this helps you.....