You need to review the principle of Chemical Equilibrium i.e., CH4(g) + H2O(g) <--> CO(g) + 3H2
Yes, some chemical reactions may be reversible.
When an equilibrium exist between reactants and products the reaction is reversible.
These are reversible reactions, having both directions possible.
Look an example:
NH4Cl(s) ↔ NH3(g) + HCl(g)
none are reversible
some chemical changes can be reversed but they are hard to reverse usually
Physical changes are reversible changes, such as change of state (boiling, melting etc), chemical changes are when something undergoes a reaction changing it's chemical makeup.
The type reaction that changes the reactants into products is called a chemical reaction. Most chemical reactions can run forward or backward.
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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
Some chemical changes are reversible, others are not.
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
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
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 are reversible changes, such as change of state (boiling, melting etc), chemical changes are when something undergoes a reaction changing it's chemical makeup.
Physical changes and Chemical changes are both the same - this would be a reversible change.
Reversible changes are the chemical reactions that can be reversed, however most are non reversible. The ones that can be reversed is because the reaction can flow both ways.