0
the number of atoms? if the chemical change happens in a closed space, all the atoms are still present in one form or another. In another words, chemical reactions follows the principle of conservation of mass. This principle is founded on the assumption that matter can neither be created or destroyed. Thus, the total mass of all compounds prior to the chemical change/reaction should be the same as the total mass of all compounds after the chemical change.
example: you burn wood, it releases all kinds of chemicals in the smoke, water vapor, and ashes. if you could collect all the water vapor and the smoke, you would still have the same number of atoms - now they would have less energy (since the heat produced from burning them is gone) but there would still be the same number of atoms, albeit in different compounds probably.
What else can I help you with?
Is folding paper a physical change or a chemical change?
Physical.
Are new substances formed in a physical?
No, new substances are not formed in a physical change. A physical change is a change in the form or appearance of a substance without changing its chemical composition.
Ice melting is a physical or chemical?
physical because a chemical change means it can never form back
Can a substance produced during a chemical change be easily changed back into the original substance?
In general, a substance produced during a chemical change cannot be easily changed back into the original substance. Chemical changes are characterized by the formation of new substances with different chemical properties than the original substances. Reversing a chemical change typically requires a different set of reactions or processes.
Does mass of ingredients change during a physical changes?
it is neither. no chemical reaction or physical change (melting boiling etc) can change net mass only nuclear reactions change the over all mass by converting mass to energy via Einstein's famous E=MC^2 equation
Why is Breaking of glass a physical change?
A physical change can be reversed, for it does not change what the object is made of. The glass, even when broken, is still glass. It can be put back into its original state (possibly through melting) because it never changed what it was made out of.
When an aluminum can is crushed did it undergo a physical change or a chemical change?
When a aluminum can is crushed, it undergoes a physical change, because even though the object got crushed and misshaped it still has the same identity.The identity has never changed.
What is an aggregate constant?
An aggregate constant is a nonscalar constant which value never change or are not changed during execution of the program.
Can either the iron or the wood change back to the kind of matter they were at first?
It depends if the change is physical or chemical. If it is a physical change, the wood or iron never really changed, just it's physical appearance. If the change is chemical then the wood or iron supposedly can't change back to it's original substance or matter.
Who changed Germany's name during the holocaust?
Germany's name never changed during the Holocaust.
In a physical change some of the physical properties of the substance may be altered and the chemical composition?
In a physical change, the chemical composition of the substance remains the same, but some physical properties like shape, size, or state may change. This means that the substance can be reversed back to its original state without undergoing a chemical reaction.
What did Michael Jackson change his name to?
He never changed his name.
Is ice melted a physical or chemical change?
physical because a chemical change means it can never form back
What were some of the changed brought about by the renaissance period?
There were many things that changed during the Renaissance. Such as the art, literature, and even religion which would have never be allowed in medieval times. The Renaissance was a whole change of mind. :)
Witch country has never changed?
No country has never changed. The science "anthropology"is founded on the premis that all socities are in a state of continuous change.
Is folding paper a physical change or a chemical change?
Physical.
Are new substances formed in a physical?
No, new substances are not formed in a physical change. A physical change is a change in the form or appearance of a substance without changing its chemical composition.
