0
Because you can't put it back together. Imagine burning a piece of paper, there is no way that you can get that piece of paper back. Burning that piece of paper was a chemical change because you changed the chemical properties of the paper. Crumpling or cutting the paper doesn't change the molecular structure of the paper, so it is a physical change.
What else can I help you with?
Does a chemical change occur when a piece of wood is painted?
When you burn wood a chemical change occurs.
How do you know if there is a chemical change?
You can determine if a chemical change has occurred by observing a change in color, production of gas, formation of a precipitate, or a change in temperature. Chemical changes involve the formation of new substances with different chemical properties.
Is the flammability of ether a physical or chemical change?
The flammability of ether is a chemical change because it involves the breaking and forming of chemical bonds to produce heat and light. When ether reacts with oxygen during combustion, new chemical compounds are formed.
How you tell if matter has undergone a chemical change or a physical change?
If a chemical change has occurred, the chemical composition has changed and new products will have formed, different from the reactants. If a physical change has occurred, the chemical composition does not change and no new products will have formed.
Whats the difference between a physical change and a chemical change?
Physical change- A physical change can be reversed and the object changed is still the same object. The Molecular structure of this object is not changed to make another substance. An example of this would be cutting paper with scissors or shattering glass on the floor. Chemical Change- A chemical change usually cannot be reversed. After this type of reaction takes place a new substance is created. The molecular structure of the object is changed to make a new substance. An example of this would be burning wood, rusting, or mixing vinegar and baking soda. Tell tale signs of a chemical change is that heat, light, and gasses are given of during the reaction. simpler- physical change- state change like liquid to gas. the previous person is right about a chemical change.
Whoch of the sign of a chemical change woums you see at a campfire?
There is a few signs of a chemical change that you see in a campfire. You can tell by the color, temperature and burning.
Does a chemical change occur when a piece of wood is painted?
When you burn wood a chemical change occurs.
Is burning a log a example of chemical or physical changes?
Although it has physical consequences, burning a log is a chemical change. The molecules of the log react with oxygen to form carbon dioxide, water steam, and many other products. A simple, fairly reliable test to tell the difference between physical and chemical changes is: Can the process be reversed rather easily? If the answer is yes, like dissolving salt in water, it is a physical change; if no, a chemical change.
Is wax melting chemical or physical change?
This is a physical change, not a chemical change! It is because all the wax is still all there as for if it was a chemical change it would be all gone!Physical. Its physical state changed from solid to liquid. It's chemical make up remains the same.Melting wax is a chemical change because a new substance is forming. Trust me im intelligent and we just learned this in science.physical change :)It is a chemical change because it gives off heat even when it is burning. heat is one of the signs that tell whether it is physical or chemical change. The signs are heat , light's ,gas,discolor.Melting was would be a physical change-- no chemical reaction occurs when something melts or boils. A burning candle is a chemical change, both can occur at the same time.
Is the burning of leaves or melting of butter a physical reaction?
The burning of leaves is a chemical reaction. The way we can tell is because after the leaves are burned, they cannot go back to the way they were. Butter melting is a physical reaction because it does not change the molecules, and the butter has the ability to go back to it's original state.
How can you tell that the burning of a candle causes both physical and chemical change?
By observation: 1. A flame shows that heat is being generated, indicating a chemical change taking place. 2. A physical change would be the solid wax changing to liquid under the flame.
How can you tell chemical change?
The consequence of a chemical change is the modification of the molecular nature.
How can you tell there is a chemical reaction when iron rusts?
Because it is not a physical change it is a chemical change.
How can you tell that burning wood is an irreversible change?
Burning wood is an irreversible change because it results in the formation of new substances like ash and smoke that cannot be easily reversed back into wood. The chemical structure of the wood is altered during the burning process, making it impossible to return it to its original form.
Can you tell your car is burning oil when you do an oil change?
You can tell this before an oil change. If you see blue smoke coming out the exhaust your engine is burning oil. If you're oil level is low and you have no oil leak your burning oil.
Is melting wax a physical chemical or nuclear change?
This is a physical change, not a chemical change! It is because all the wax is still all there as for if it was a chemical change it would be all gone!Physical. Its physical state changed from solid to liquid. It's chemical make up remains the same.Melting wax is a chemical change because a new substance is forming. Trust me im intelligent and we just learned this in science.physical change :)It is a chemical change because it gives off heat even when it is burning. heat is one of the signs that tell whether it is physical or chemical change. The signs are heat , light's ,gas,discolor.Melting was would be a physical change-- no chemical reaction occurs when something melts or boils. A burning candle is a chemical change, both can occur at the same time.
When ice melts why can you tell there is not a chemical change?
Melting is not a chemical change because the chemical formula of water remain unchanged.
