Question

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

Answer 1

For the first question, i think the correct answer is the third option. When a gas is formed, it is the most conclusive in determining whether a chemical reaction has taken place given that none of your reactants is a gas.

For the second question, the statement is true.

For the third question, the correct answer is the last option.