You need to review the principle of Chemical Equilibrium i.e., CH4(g) + H2O(g) <--> CO(g) + 3H2
Reversible changes and physical changes are not exactly the same. Reversible changes can be undone and the original substance can be recovered, while physical changes alter the appearance or state of a substance without changing its chemical composition. Physical changes are usually reversible, but not all reversible changes are physical changes.
some chemical changes can be reversed but they are hard to reverse usually
Physical changes are changes that affect the form of a chemical substance, such as changes in state or shape, without changing its chemical composition. Chemical changes, on the other hand, result in the formation of new substances with different chemical properties. Physical changes are usually reversible, while chemical changes are often irreversible.
Not all changes in states for elements are reversible. Physical changes, such as melting or boiling, are typically reversible, allowing the substance to return to its original state. However, chemical changes, like combustion or rusting, result in new substances and are generally irreversible. Therefore, the reversibility of a state change depends on whether it is a physical or chemical change.
The classical example of a reversible chemical reaction is:2 NaCl + CaCO3 ↔ Na2CO3 + CaCl2
All physical changes are reversible.
chemical reactions are irreversible but physical changes are reversible
Reversible changes and physical changes are not exactly the same. Reversible changes can be undone and the original substance can be recovered, while physical changes alter the appearance or state of a substance without changing its chemical composition. Physical changes are usually reversible, but not all reversible changes are physical changes.
Chemical changes create new substances and cannot be reversed.Burning paperLighting a matchMixing sugar and waterPhysical changes do not create new substances and can be reversed.Crushing a canTearing paperChopping wood
Most cooking processes are chemical reactions. Generally, the reactions are non reversible and once cooked, food cannot be returned to an uncooked state. So, frying potatoes causes a non reversible chemical reaction. The question is not as precise as it might be. Changes can be physical or chemical. They can also be reversible or non reversible but it is important to note that many chemical changes are reversible just as many physical changes are reversible.
some chemical changes can be reversed but they are hard to reverse usually
Physical changes are changes that affect the form of a chemical substance, such as changes in state or shape, without changing its chemical composition. Chemical changes, on the other hand, result in the formation of new substances with different chemical properties. Physical changes are usually reversible, while chemical changes are often irreversible.
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.
I would argue that in theory all chemical changes are reversible. However it is certainly true that considerations of enthalpy and entropy mean that some are totally impractical to reverse.
Physical changes and Chemical changes are both the same - this would be a reversible change.
Some chemical changes are reversible, others are not.