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How can you tell if somthing has gone through a chemical change?
Wiki User
∙ 12y ago
When chemical changes occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated.
Eg of a chemical change is the reaction between sodium hydroxide and hydrogen chloride to produce sodium chloride, or common salt.
Wiki User
∙ 12y ago
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True or false The candle wax has undergone a chemical change?
False because the wax would have gone through a physical change since it has only melted and turned into liquid but you can reverse the effect by cooling it so it becomes a solid again. (No new substance formed) When the string is burned by the fire, the change is irreversible. Also, when the string is burned, new substances are created like gases and ash making it a chemical change. Since no new substance forms when the candle wax melts, that's why it is a physical change, not a chemical change.
How do you know when something has gone through a physical change?
You first must know what it looked like before the change and be observant enough to tell.
What observable changes are there in a burning log?
All its substance goes gone it turns to ashes so it's not wood anymore and it becomes Chemical Change
What combination changes in a chemical change?
It really depends. There is no definite combination that can change into a chemical change. A chemical change is basically a change where the molecules or particles inside the original substance changes its property or what it is. Here are some examples: Baking Soda and Vinegar Iron rusting (its not iron, its rust after the change has gone) Silver or copper tarnishing Photosynthesis
As liquid water changes to a gas does it become a new compound?
No It's still H2O but it has gone through a "state change"
What is something with no chemical change?
Usually it means that something has gone through a physical change and any chemical properties of that substance are not altered.
Is an egg gone off a chemical or physical change?
chemical
Is burning of a candle is physical change?
Burning is always a chemical change. Look at it like this; if you can't put it back together like it was to begin with, it most likely has gone through a chemical change i.e. copper oxidizing, burning paper...
Is drying of fish is a chemical change?
No. Physical cause it hasn't changed its just gone from wet to dry :-)
What chemical change is present when milk has gone sour?
because ther is carbondioxide
What food has gone through a physical change?
hi
What changes has the computer gone through since it was invented?
It has gone through physical change and size change in the shape and technology itself has been modified to hold more and be smaller.
Suger dissolved in water has gone through what process?
it been through phycical change
True or false The candle wax has undergone a chemical change?
False because the wax would have gone through a physical change since it has only melted and turned into liquid but you can reverse the effect by cooling it so it becomes a solid again. (No new substance formed) When the string is burned by the fire, the change is irreversible. Also, when the string is burned, new substances are created like gases and ash making it a chemical change. Since no new substance forms when the candle wax melts, that's why it is a physical change, not a chemical change.
Is Leather an animal or plant product?
Leather is cow hide that has gone through a chemical process to make it leather
Is green leaves turn to yellow a chemical change?
too much water Lack of nitrogen in the soil
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.
