1. In a chemical change the bonds of anything are broken down and then new bonds form from the others. A physical change is any visible change or a change that does not change substance. If i colored a piece of paper that would be a physical change.
http://en.wikipedia.org/wiki/Physical_change http://en.wikipedia.org/wiki/Chemical_change
2. Change in color, temperature, form, and odor.
http://en.wikipedia.org/wiki/Chemical_change#Evidence_of_a_chemical_change
3. Mass that is contained in a closed system can't be changed. Lavoisier created the law.
http://en.wikipedia.org/wiki/Conservation_of_mass
4. Thermal is the Total Ek of a substance.
Temperature is the Average Ek of a substance.
http://wiki.answers.com/Q/How_is_temperature_different_from_thermal_energy
5. Crocodiles are exothermic because they obtain energy from sunlight, and tigers are endothermic because they burn their own energy to produce heat.
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