Many chemical reactions are irreversible. In a chemical reaction, new materials are always formed. Sometimes these ... back to a raw egg again. Mixing substances can cause an irreversible change.

Explain that when substances are mixed and a new substance is formed, a chemical reaction has occurred. Demonstrate the production of a precipitate using magnesium sulfate (Epsom salt) and sodium ...

Chemical reactions can be represented using equations. Compounds are chemical substances ... into new compound molecules. For example, if carbon atoms react with oxygen atoms they form carbon ...

Students will be able to make measurements showing that whether the process is a change of state, dissolving, or a chemical reaction ... mass of the substance and the liquid it dissolves in does not ...