Differentiate between physical and chemical changes by giving examples.
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Answers
Explanation:
Physical Change Chemical Change
When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged. When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
Physical change is a temporary change. A chemical change is a permanent change.
A Physical change affects only physical properties i.e. shape, size, etc. Chemical change both physical and chemical properties of the substance including its composition
A physical change involves very little to no absorption of energy. During a chemical reaction, absorption and evolution of energy take place.
Some example of physical change is freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
Answer: A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.
Explanation:
Key idea:
1. Often, physical changes can be undone, if energy is input. The only way to reverse a chemical change is via another chemical reaction.
Examples of Chemical Changes: A new compound (product) results from a chemical change as the atoms rearrange themselves to form new chemical bonds.
1.Burning wood
2.Souring milk
3.Mixing acid and base
4.Digesting food
5.Cooking an egg
6.Heating sugar to form caramel
7.Baking a cake
8.Rusting of iron
Examples of Physical Changes: No new chemical species forms in a physical change. Changing the state of a pure substance between solid, liquid, and gas phases of matter are all physical changes since the identity of the matter does not change.
1.Crumpling a sheet of aluminum foil
2.Melting an ice cube
3.Casting silver in a mold
4.Breaking a bottle
5.Boiling water
6.Evaporating alcohol
7.Shredding paper
8.Sublimation of dry ice into carbon dioxide vapor