physical changes are sometimes reversible
The steam when cooled changes back to liquid water. A chemical change is usually not so reversible.
some chemical changes can be reversed but they are hard to reverse usually
It is a physical change because when you have a chemical change it changes the properties and makes it into a new thing, and it can't be reversed. Physical changes are usually just changes of states (solid, liquid, gas) and a physical change can be reversed.
phisiological change,its not a physical or chemical change
heat reaction leads to both physican and chemical changes
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.
Reversible reactions usually involve a reaction that changes the physical state of the substance, not the chemical properties
The steam when cooled changes back to liquid water. A chemical change is usually not so 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.
No,it's a chemical change,because the petrol used can't reversible,also.A considerable amount of heat change is usually involved.
some chemical changes can be reversed but they are hard to reverse usually
Physical, or state changes are usually accomplished with heating or cooling
It is a physical change because when you have a chemical change it changes the properties and makes it into a new thing, and it can't be reversed. Physical changes are usually just changes of states (solid, liquid, gas) and a physical change can be reversed.
Physical changes are usually reversible and chemical changes you can't usually reverse them. Frying an egg is chemical because you can't get the raw egg back. Freezing water would be physical... hope this helps! ----------- Chemical change is a change that imply modifications in the structures of molecules; new compounds appear. Ex.: burning of coal with releasing of carbon dioxide and water. Physical changes don't imply the structure modification of the molecules but only the state of matter, form, dimensions; the chemical compound remain unchanged. Ex.: grinding of coal to be used in a thermal power unit.
A physical change changes the physical properties of an element like color where chemical changes change the chemical properties of an element and usually can't be undone.
The difference between them is that in a chemical reaction, the chemical make up of the substance put into the experiment is changed or modified. In a physical change, only the physical attributes of the substance is changed, like size, shape, color, density, etc.