Biology, 08.10.2021 06:10 lilisagaser4505
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
The shape of the coal changes.
Oxygen is present.
A new substance is produced.
Coal is made up of more than one element.
Answers: 2
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Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxy...
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