1. The main difference between a physical change and a chemical change is in a physical change no new substances are born. In a chemical change one or more new substances are born
http://www.physlink.com/education/askexperts/ae244.cfm
2. 4 ways to tell a chemical change has occured are a temperature change, a colour change, a gas given off, or a sound given off
http://wiki.answers.com/Q/How_can_you_tell_a_chemical_reaction_is_occurring
3. The law of conservation of mass states that matter cannot be changed or destroyed, but it can change forms and Antoine Lavoisier
http://wiki.answers.com/Q/What_is_the_Law_of_Conservation_of_Mass
4. Thermal Energy and Temperature are different because thermal energy is the total amount of kinetic energy in a substance and temperature is the average amount of kinetic energy in a substance
http://wiki.answers.com/Q/How_is_temperature_different_from_thermal_energy
5. An example of an exothermic reaction is adding water to anhydrous copper (II) and sulfate
http://en.wikipedia.org/wiki/Exothermic_reaction
An example of an endothermic reaction is dissolving ammonium chloride in water
http://chemistry.about.com/od/lecturenotesl3/a/endorxns.htm
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