Did the temperature increase, decrease or stay the same during the reactions? Remind students that the gas produced in each reaction is a new substance formed as a result of a chemical reaction ...

Atoms are rearranged during a chemical reaction, but the number of ... so they feel cold. A new substance must be produced for a chemical reaction to take place. Lots of chemical reactions are ...

They are found as fragrances in cosmetics or as flavorings in food, and form the basis of new medications: Terpenes are ...