1. The difference from a chemical change to a physical change is that a Physical change is when, for example a cube of ice can melt and it can freeze again into a solid ice cube. A chemical change, for example is when you burn a log you cant change it back into a solid log it is ashes. http://www.physlink.com/education/askexperts/ae244.cfm
2. It can change in Burning, color change, smell change, and temperature change.http://wiki.answers.com/Q/Name_4_ways_you_can_tell_a_chemical_reaction_take_place
3. Mass is nor created or destroyed in a closed system, by Sr. Isaac Newton.
4. Temperature and thermal energy are different is temperature is how hot or cold it is and thermal energy the storage of kinetic energy in the atoms of a particle. HELPED BY HAMPTON
5. The exothermic reaction is fire,and endothermic is like when you have a rock in a fire and it gets warmed up and is hot because of the fire not producing its own heat.
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