A control is a trial that duplicates all conditions except for the variable under investigation.
A renewable resource is a resource that can be replenished by natural processes over the time frame of human experience.
Some Suggestions:
1. If polyatomic ions, such as NO3- and CO3 2-, appear as both reactants and products, treat them as units, rather that balancing their atoms individually!
2. If water is involved in the reaction, balance hydrogen and oxygen atoms last!
3. RE-count all atoms after you think an equation is balanced, just to be sure!
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