Which of the following choices is the most conclusive in determining whether a chemical reaction has taken place?
a change in color
a change in odor
a gas was formed
a change in the identity of the substance (s)
If different products are not created during a process, then a chemical reaction has not occurred. True or false?
Chemical equations provide:
the physical state of each reactant and product.
the ratios of reactants and products.
the chemical identity of the reactants and products.
all of the above information
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