You can easily un-melt it, i.e., wait for it to cool down and get hard again. However, the energy required for melting can't be recovered (useful energy gets converted into unusable energy), so in that sense, this process (and most processes in nature) are irreversible.
Adding heat to a substance can cause it to change in various ways, such as melting, boiling, or burning. These changes are usually reversible if the substance is not permanently altered by the heat.
Yes, a physical change occurs when matter changes state. This change is reversible and does not alter the chemical composition of the substance. Examples include melting, freezing, vaporization, and condensation.
The heat from a candle increases the rate at which wax melts. The heat energy transfers to the wax, causing it to soften and eventually turn into a liquid. This process happens faster with more heat, leading to quicker melting of the wax.
The burning of a candle is a chemical reaction called combustion, which involves the candle wax (a hydrocarbon) reacting with oxygen in the air to produce carbon dioxide, water vapor, and heat. This reaction releases energy in the form of light and heat.
Temperature remains constant during the solidification of wax because the heat energy released by the wax as it solidifies is absorbed by its surroundings. This is due to the latent heat of fusion, which is the energy required to change a substance from liquid to solid at its melting point without a change in temperature.
The melting of a candle is a reversible change because the solid wax can be cooled and solidified again to form a new candle.
yes!
No, burning wax is an irreversible change. When wax is burned, it undergoes a chemical reaction that changes it into different substances (carbon dioxide, water vapor, and heat) that cannot be easily reversed.
No, a lava lamp is not a reversible change. The melting and mixing of the wax and oil inside the lamp is a physical change that cannot be easily reversed to its original state.
It is a physical change, from a solid to a liquid. The chemical composition of the wax remains unchanged.
No, it is not.
Yeah, definitely. Just wait.
Wax melting is a reversible physical change, not a chemical reaction. When wax melts, it changes from a solid to a liquid state due to the application of heat. Once the heat is removed, the liquid wax will solidify back into a solid form without undergoing any chemical changes.
This observation refers to a physical change. The melting and solidifying of the wax is a reversible process that does not change the chemical composition of the wax molecules.
The wax of the candle melts and then rehardens. This is a physical change and reversible
Melting candle wax is a chemical change. Why? Because when you cook or burn candle wax it melts so it is a chemical change.
Melting is a physical process.