Homework 8- Objective 2
1. The main difference between a chemical change and a physical change is that during a chemical change the identity of a substance’s chemical changes. During a physical change, the chemical nature of a substance doesn’t change.
2. The 4 ways a chemical change can happen are spontaneous, heat, light, and electricity.
3. The Law of Conservation is mass means that mass isn't created or destoyed. it is constant.
4. Temperature is a number that relates to energy, but it isn't energy. Thermal energy, or heat, is actual energy. Adding heat, means adding energy.
5. An endothermic reaction would be the reaction Zelle and I did in class. We put baking soda and acentric acid together, and it got cold. An exothermic reaction would be elephant toothpaste. The reaction became hot and you could feel the warmth on the container the experiment was done in.
Citations:
http://en.wikipedia.org/wiki/Physical_change
http://en.wikipedia.org/wiki/Chemical_change#Examples_of_chemical_changes
http://en.wikipedia.org/wiki/Conservation_of_mass
http://zonalandeducation.com/mstm/physics/mechanics/energy/heatAndTemperature/heatAndTemperature.html
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