Warming chocolate is a physical change because it changes the physical state of the chocolate from solid to liquid without forming any new substances.
Yes. It's just like ice to water and back to ice. - - - - - "Reaction" implies a chemical change. Melting chocolate is a physical change. (Hardening melted chocolate can involve a whole series of physical changes but that's a different issue.)
This is a reversible process.
You think probable to a reversible reaction.
Reversible.
chocolate is reversible when you melt it put it in the freezer but if you eat it it will not be reversible
Monkies
yes
Coffee dissolving, water boiling and chocolate melting are reversible physical transformations whereas wood burning is a chemical combustive transformation.
I do. Global warming exists. The main cause of global warming is the increase in greenhouse gases from burning of fossil fuels (coal, oil and natural gas) in industry, transport and the generation of electricity, which releases carbon dioxide (CO2). That increase is reversible. The second leading cause is the increase in deforestation. That is also reversible.
examples of physical change are ice,water,chocolate,liquid,
Warming chocolate is a physical change because it changes the physical state of the chocolate from solid to liquid without forming any new substances.
Hot chocolate itself is not thermal energy. However, a person warming his or her hands on a cup of hot chocolate IS an example of thermal energy. :)
no, you cannot get cheese back to cheese when melted
Yes. It's just like ice to water and back to ice. - - - - - "Reaction" implies a chemical change. Melting chocolate is a physical change. (Hardening melted chocolate can involve a whole series of physical changes but that's a different issue.)
An example of a reversible change is an ice cube meting into water and then changing back to an ice cube again if frozen. Another is chocolate melting when heated and changing back to a solid when cooled.
Two words... Global Warming...