it is a physical change
it is a physical change
It is a physical property. A chemical property would involve the butter reacting to the toast, but the butter is actually reacting to the heat from the toast. The butter would melt against any surface hot enough, where as butter would not melt on cold toast. Hence, the reaction to heat makes it a physical property. (A relatively easy way to remember is that physical properties deal with the transfer of physical energy or force such as heat, inertia, etc. Chemical properties occur when two material substances trade molecules or electrons.)
Chemical
Physical change.
Physical. It is still butter. It is still just a piece of bread. But now it is butter on a piece of bread with a bite out of it. The bread/butter is not chemically changing to form a TOTALLY new substance. For instance, when you melt butter its no longer a solid its now a liquid. Looks different, the temperature is different, and it may even taste diifferent but its still butter. But if you were to take sugar and dissolve it in water it becomes a totally different substance.
chemical
physical
chemical change
Toasting bread represents a chemical change.
Chemical, because the disaccharide in toast when heated become hard thus giving you toast
It is kind of both....The chemical: The toast loses its water molecules and so loses most of its H2O.The Physical: The toast becomes hard and crunchy from soft and airy.Added:The toast burning is a total physical change, not chemical. Water loss from the toast is not a chemical change as species have not changed partners ( atoms have not rearranged into new species ) and H2O remains the molecule H2O, water.
It is kind of both....The chemical: The toast loses its water molecules and so loses most of its H2O.The Physical: The toast becomes hard and crunchy from soft and airy.Added:The toast burning is a total physical change, not chemical. Water loss from the toast is not a chemical change as species have not changed partners ( atoms have not rearranged into new species ) and H2O remains the molecule H2O, water.