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If a chemical change requires energy, which of the following could be the source of the energy?
a. heating with a flame
b. settling the mixture for 20 minutes
c. measuring mass from a balance beam
d. adding more substance to the observed material

Respuesta :

meerkat18
The answer for the question given is A. Heating with a flame.

One of the processes that cause a chemical change is heating. An example of this is cooking or baking, which causes a permanent chemical change in substances. Also, all of the other choices are examples of physical changes. 

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