Physical changes are reversible (reversal is often quite easy).*
Chemical changes are not reversible (reversal is often extremely difficult). *
The chemical composition of materials is different after a chemical change but the same after a physical change.
Chemical change:
Bonds have changed; the substances present before the change, are different from those present after the change:
A substance reacts to form a new chemical entity
same atoms are used, but different molecules have been created.
Examples:
The electrolysis of water: the products are two different substances;
Combustion of hydrogen in oxygen; forms water and generates heat;
The body's combustion of glucose produces carbon dioxide and water;
Bread made into toast (partially oxidized bread) is not reversible;
Wood burned in a fireplace is not reversible;
Burning of the World Trade Center.
Physical Change:
State, size, shape, or color of a substance is changed basic character-unchanged; Change of physical properties, leaving basic character-unchanged.
Examples:
Melting of ice: change of state;
Bearing gold into a ring;
Grinding;
Cutting;
Folding;
Collapse of the World Trade Center
* Physical changes aren't always easy to reverse, and chemical changes aren't necessarily impossible to reverse.
a physical change is reversible but a chemical change is irreversible
The diffence between chemical and physical is that ones chemical and ones physical!!
A change of state is a physical change while a chemical change is not
Physical change is homogeneous and vise versa for change (heterogenous)
physical change is a change in matter in which no new substance is formed Chemical change is a change in matter in which new substance is formed
the difference between a physical change and a chemical change is that a physical change is usually reversible whilst a chemical change is not reversible.
the difference between a physical change and a chemical change is that a physical change is usually reversible whilst a chemical change is not reversible.
the difference between a physical change and a chemical change is that a physical change is usually reversible whilst a chemical change is not reversible.
A physical change is reversible, a chemical change is not.
a physical change is reversible but a chemical change is irreversible
a physical change is reversible but a chemical change is irreversible
The diffence between chemical and physical is that ones chemical and ones physical!!
what is the difference between a physical change and a physical property
A change of state is a physical change while a chemical change is not
Physical change is homogeneous and vise versa for change (heterogenous)
Physical change, changes the appearance or the surface. Chemical change, changes the minerals inside the object. Physical deals with the appearance and the surface. Chemical changes the structure of the minerals inside the object.
A chemical change is when the chemical properties of a substance changes and a physical change is when the chemical properties stay the same but the physical properties (shape, temperature etc...)