Intramolecular bonds (such as ionic or covalent bonds) can be broken down by a chemical change.
It cannot be split by a chemical reaction.
Chemical bonds ( ionic Or covalent mainly, but metallic is also possible)
compound mixture element or solution
Yes, it is possible for a molecule.
Compounds or mixtures.
heluim
Atoms.
You are describing a mixture.
Water cannot be separated into hydrogen and oxygen by boiling. Boiling is a physical change which means the molecule doesn't change at all--liquid water and water vapor are both H2O. Water can be separated into hydrogen and oxygen using electricity, this would be a chemical change.
A mixture or a substance (Compound) - yes; an element - not.
Posters fading is a chemical change. The chemical properties of the poster originally reflected a lot of light, but when they fade (usually due to overextended sunlight exposure), the chemical properties of the poster change to reflect less light.
This is a chemical change.
It is a chemical change.2NaCl --> 2Na + Cl2
The substance is a compound, which forms chemical bonds that cannot be physically separated, but only by a chemical change.
This is a chemical process.
a mixture
With ionic compounds anyway, they dissociate into their ions. The chemical change is an equilibrium until separated.
Atoms.
You are describing a mixture.
Explain how a mixture of sand and salt can be separated.
This is a chemical process.
A chemical change occurs because compound is two elements put together so when they are separated it forms a new substance.
It is not a chemical change. The iron and sand can be separated out.