Some chemical changes are reversible, others are not.
Chemical change. Physical changes (like melting) can be undone. But you cannot unbake a cake.
Panning (for gold) is neither of the above.
A chemical change. Physical changes can be undone. You cannot unburn paper.
Chemical change, because it cannot be reversed/ cannot be undone Iron rusting is a chemical change (Oxidization) the elements iron and oxygen form a molecular bond to form a compound known as Iron oxide (Rust). this reaction can be undone as is done with iron ore.
It's a chemical change. The aluminum foil is rusting, which cannot be undone, meaning that this is a chemical change, not a physical. Physical changes can be reversed.
It is a physical change as it can be "undone" by evaporating the water. An simple example of a chemical change is baking a cake, you can't un-bake a cake. To work out whether it is a chemical or physical change just think whether it can be undone or not.
Physical changes can be undone. It is not possible to unfry a chicken. The heat casues chemical changes in the meat and in any coating.
Chemical change. Physical changes (like melting) can be undone. But you cannot unbake a cake.
Panning (for gold) is neither of the above.
A chemical change. Physical changes can be undone. You cannot unburn paper.
A physical change is a change that can be undone. A chemical change cannot be undone. An example of this would be dissolving salt in water. This is a physical change because if you let the water in the container evaporate the salt will be left behind. A chemical change would be like burning a piece of wood since you cannot undo the change taking place to the wood.
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.
Chemical change, because it cannot be reversed/ cannot be undone Iron rusting is a chemical change (Oxidization) the elements iron and oxygen form a molecular bond to form a compound known as Iron oxide (Rust). this reaction can be undone as is done with iron ore.
Chemical change, because it cannot be reversed/ cannot be undone Iron rusting is a chemical change (Oxidization) the elements iron and oxygen form a molecular bond to form a compound known as Iron oxide (Rust). this reaction can be undone as is done with iron ore.
Physical change- it can be undone by evaporating the water.
It's a chemical change. The aluminum foil is rusting, which cannot be undone, meaning that this is a chemical change, not a physical. Physical changes can be reversed.
Heat brings about a chemical change. Physical changes can be undone, but you cannot unbake a cake.